What Is Rough Idle
While this might not seem like a pressing matter, a rough idle can signal a problem with the car's engine. Standard natural Turquoise is what most mid-range to high end production jewelers use. The idle might smooth out for a minute or too but then gets really rough again. Therefore, if the idle air control valve is not functioning properly, you will notice that your car is revving or idling irregularly. When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. How to Video's on my install of:Chrome Handles, Chrome Roof Rails & Fog lights, Air filters. Ok here it is: I have a 2005 rs. So my rough idle was fixed but now I still have a running lean code. Other reasons for the rough idling include: Exhaust problems. If your car's idle is rough, possibly rising and falling, or struggling to maintain a steady rate of rotation, you may have a problem that needs fixing. Spark plugs create the spark that is needed for your car to burn fuel. Took the truck in had all new injectors installed, new pass throughs, new exhaust manifold (old one was cracked) new turbo installed (old one was cracked). it is unsafe to be driving a vehicle that acts in this manner because you can't control the way you want to. Then I plugged the sensor back in with it running and there was no change at all. Idle is slightly better warm but still shakes the truck. dirty fuel injectors and worn engine valves will cause rough idling. Flashed for about 3 seconds she went away, however power still wasn’t right and the idle was very very rough, whole car would shake and vibrate. Repairing engine problems can mean a significant expense, so it's best to have a rough-idling car checked out by a qualified mechanic as soon as you notice the car idling rough. rough idle, running rich Forced Induction. Re: Need help cold start rough idle! I have about 1400 Mikes on RZR 1000 S and just checked my Valves and they were all in spec but on the tight side (Lower Spec), mine is running fine, just thought I would throw that in. I put it into reverse and this is where it craps the bed. 2 Petrol - 2008 VW Polo shaking when idle. The idle motor it self has quite a bit of delay to get the mass of the motor internals moving. it is unsafe to be driving a vehicle that acts in this manner because you can't control the way you want to. rough idle with air conditioning on At some point during the month of August the Roadfly forums are going to become archive only. I can hear the engine "laboring" at one spot and it lunges forward at that exact spot. We'll cover the most common causes of rough idle below. i am looking at leaking vacuum hoses or intake manifold gasket leak. If the engine will run( has to for the stuff to work obviously )2+4 is my go to pour in fix in a can. At low revs sounds very rough. There is a idle air hose that connects to the idle air control and to the passenger side vave cover. It's generally located on the throttle body and in the case of my 2000 Dodge Ram 5. My 85 has a rough idle. Re: who all has rough idle in a 3. 4 16v with a KFU engine. No trouble codes ever show up and my check engine light stays off. Took the truck in had all new injectors installed, new pass throughs, new exhaust manifold (old one was cracked) new turbo installed (old one was cracked). As soon as I start to drive and apply throttle the temperature gauge goes from min to max (typically stays at 210) and the engine almost dies and cuts off, almost like it has bad gas. Allow the vehicle to idle until the cooling fans come on. For example, if your car has a 2. an irregular and rough idle - sometimes stumbling and pulsing with vacuum varying from 10-15". Recently, the Altima developed a rough idle just after it has started. hard shake and idle problem while sitting still. It could be a couple other things, too, but those are the most common and first things you should explore. found the cause of my rough idle - Ford Modifications Website. Noticable in park, worse in drive when waiting at a light. They don't know. Hey guys, I have a bone stock 2004. If your car, truck, or SUV doesn't run up to snuff, you can pull off to the side of the road and call for towing assistance. alright, i was just reading a post about a rough idle. It's item number 28 on page F-194. With long duration cams running at idle, the result is the typical rough idle that you hear on many hopped up V8s. This is not a violent shake, but enough to make parts of the dash rattle and be very annoying. I just replaced the plugs about 3 months back and it ran fine after, people have told me things like it is the o2 sensors to the cat is plugged up to my fuel filter is bad. Usually I’ve read that it would be the other way around where it would start and then run rough or stall out. Replaced same but ever since good days and bad days with idle. 4L is a rough idle where we will have high idle for a few seconds when slowing or coming to a stop followed by a drop off to a very low rough idle after stopped for a few seconds sometimes even to the point of stalling out. 3l and it's idleing really rough, and during an extended idle, 10mins or so, with a/c running it stalled out. I noticed the rough idel issue during the last cold spell here in Dallas. There is a thing which causes the engine to idle up when the AC is turned on it seems this isn't working correctly. All right here is the puzzle; Since the FCA was changed the truck idle is okay in Neutral. Spark plugs create the spark that is needed for your car to burn fuel. I recently puchased a 2007 9-5 2. In combustion engines , idle speed is generally measured in revolutions per minute (rpm) of the crankshaft. One of the most common glitches on the BMW E30 3 Series is an erratic engine idle. - Pᴀᴜʟsᴛᴇʀ2 ♦ Dec 13 '15 at 19:39. while driving my 2015 chevrolet silverado 1500 ltz with a 5. Let me use an idle complaint that had me on the ropes as an example. The following morning the car again started rough (as if it were misfiring/running on 3 of 4 cylinders) and this time it took a good minute before smoothing out. Hello all! My name is Bryan and I am new to the site. My trouble/ fault code reader only indicated an improper throttle position signal during the throttle response part of the Key On Engine Running part of the test (pressing the accelerator pedal). Compression figures are perfect and all about 14 bar. dirty fuel injectors and worn engine valves will cause rough idling. 4, it has 140K on the clock though. some people seem to think that they are the first honda owners to have this problem. Noticable in park, worse in drive when waiting at a light. T5 Transporter Van BiTDI 180 Rough Idle and Hunting If this is your first visit, be sure to check out the FAQ by clicking the link above. Hopefully, the check engine light is on. Hi, about a month back spring in the autolite2100 auto choke snapped. Boat engines have the same operating principles as do land vehicle engines, but having trouble with your boat engine can leave you and your family in a precarious predicament. I don't mean to be snarky, but the rough idle problem has been discussed many, many times. Replaced same but ever since good days and bad days with idle. It never occurs when traffic is moving, almost always when stopped or rolling at idle. i replaced the MAF and the rough idle has gone away!! but now i have a new code to troubleshoot the part that sucks is that i just replaced the MAF back in December trying to fix the rough idle. Some older cars use a carburetor to process fuel, rather than a fuel injection system. I joined hoping to find some help on fixing a problem that I have with my scag V-ride with the fx691v Kawasaki engine. These engines are experiencing a problem with carbon build-up on the top side of the intake valves. My optimax runs great at anything above idle (idle in neutral, idle in gear, forward or reverse). Tire Troubles. As above its a 2004 Peugeot 307 1. I have been chasing a rough idle issue for the past couple of months and it is killing me! I have researched this issue and have exhausted all of the threads and can't really get to a solution that doesn't require deep mechanical knowledge or a relatively large amount of money. No trouble codes ever show up and my check engine light stays off. I come outside 20 minuets later and start the pathfinder. Holes in the air intake valve. On this page we after going to be discussing some different things that can cause your rough idling condition. Over the last two years or so the van had developed a rough idle issue. a sudden it feels like the throttle lever is being pulled back down to idle. I liked the example in PD's book and videos of comparing peak compression to cylinder spark event to determine if the timing is off and did that test. After a while, my a/c would begin blowing warm. Does not sound like a v8 but a tractor. First look to see if you have a vacuum hose. Replaced same but ever since good days and bad days with idle. The specification they give, is for an engine that is fully warmed up and operating normally. The high ethenol content of the fuel makes it worse. ) the valve should move slightly. when I was done, I started the car while it still being cold and noticed no difference with the Idle, the car still runs rough while cold. I can only notice it when its in gear and i am at a stop. Therefore, if the idle air control valve is not functioning properly, you will notice that your car is revving or idling irregularly. You may have a misfire, a vacuum leak, or a clogged/faulty idle air control valve. Smooth as silk after 30K. 5 Ecoboost - has 5,500 miles on it - bought three months agoIn the morning, when I start it up, it starts fine, but it will idle real, real, real roughgive it some gas, idle will smooth out. BMW E30 3 Series Idle Speed Troubleshooting. 3 liter motor the rpm of the engine act erratic, it will increase and decrease rpm at will, i would say that it surges about 75 to 150 rpm, it especially does this going uphill. Your a/c should NOT cause your car to run rough. so about 4 seconds of fine idle and then one second of rough idleover and over. A rough idle/misfire usually starts out as being merely a nuisance, but if the causes are not identified and corrected, it may result in your engine not starting, or stopping altogether when you least expect it. This happened both in and out of gear but only when the engine was still cold, idle returned to normal once normal op temp had been reached. Once fixed, the car blew ice cold and idled completely normally. Did better once warm but stalled a couple of times and not running as smoothly as it should. So far as the rough idle goes, (I cant say about the speedo) I'm going to hazard a guess you have a problem with the Idle Air Control Valve or some call it Idle Air Motor. Recently, the Altima developed a rough idle just after it has started. The idle controller reads the RPM and moves the idle motor to compensate for a deviated idle RPM. Misfire/Rough Idle. Idle speed (or idle) is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. It currently has rough idle from 500-700 when in Drive and the brake on. a sudden it feels like the throttle lever is being pulled back down to idle. Sometimes it has a really rough idle. Extreamly rough idle only with a/c on was created by Pickles92 As the title says, my Honda Accord has a terribly rough idle, but only with a/c on. Install the intake air boot and THEN start the vehicle. It idled smoothly before the cam change, and runs fine now at higher RPM's. If this continues to occur, perform a carburetor adjustment to the idle and low-speed settings on their respective carburetor screws. By "rough" I mean the rpms will dip, and then recover. TexasNissans. The idle RPM of a car depends on the type of engine your car has. Then we noticed a hissing when were were stopped and the idle was bad. The engine has a annoying idle problem that shakes/shutters the car when idleing (in Drive) and stopped (like at a stop light). 4 16v with a KFU engine. Dash board vibrates with low frequency when car is in idle and shift is in P,R,N,D foot on brake. My problem is that when I start up the car the revs fluctuate by a few hundred for about 30 to 60 seconds. 04 with 200k, been a great truck, maintained well, no major issues. RPMs will fluctuate quite a bit and then settle down. If I blip the throttle the revs will rise and then drop again, and it barely catches in time to prevent a stall. 8 with fuel injection, and 4 speed auto. 5), the white smoke, hard start, and rough idle points to ball seat erosion in the injectors. the double spark plugs were supposed to fix this ive been debating the seafoam, especially through the brake booster line to get the best fix. However, I would think that the early dual exhaust that I have on the engine has to still be less restrictive than the single exhaust/crossover exhaust that Ford used on 292 truck engines until 1962. Runs fine when cold because the choke is operating. i have different problem with my idle. There can be many causes of a rough idle. The loaded condition is most commonly reported as idling in gear (drive or reverse), or with the air conditioning on. Hopefully, the check engine light is on. then goes fine. While observing the valve with a flashlight, turn the key to the "ON" position, (DO NOT START ENGINE. Seeing the new ignition parts havent made any difference, and the fact that theres water coming from the exhaust, It sounds like a blown/leaking inlet manifold gasket. If you have a 2010-2011 Ford F150 hard to start issue or a Ford F150 rough idle and stalling along with a P1450 trouble code, usually following a gas fill-up. Some of them won't even idle at all without raising the idle RPMs above what is considered normal (in order to introduce more air/fuel, which increases port velocities, which raises VE). Will not pass the emissions tests. We tried the spark plugs and it was a nice update but not a fix. all temps, start up and after driving 40 miles to work. A bad hose in any part of the engine is easy to fix. 2008 VW Polo 1. There is a idle air hose that connects to the idle air control and to the passenger side vave cover. With the engine idling at normal operating is caused by oscillating cam timing, diagnostic temperature CHT above 93 °C (200 °F) apply trouble codes (DTCs) P0022, P0021, P0340, and/or the parking brake and hold service brake pedal. I just locked out the cam phasers on a 2005 f150 with a 5. Cranks but does not start. Re: 2006 ram rough idle Well guys you all have some good info, The rough idle is all the time hot or cold, but the worst after hot pull and stop in traffic or at rest area stop. Highly unlikely something serious like broke motor mount since it happened when empty and under normal strain. , Idle Is Rough/Erratic, Engine Cold. thanks guys!! i reset my tune and it didn't go away either. 3t with 40k miles. Replace the cranckshaft & camshaft sensors (myself) 3. Diagnosing RPM Idle Issues in a MINI Cooper Posted on May 6, 2016 by Insourcelife Back in 2012 I bought a 2009 MINI Cooper hatchback to replace the aging 2004 BMW 330i ZHP that was rapidly approaching the point where a bunch of expensive work would be needed on a regular basis. Rough idle and sometimes would experience intermitant hesitation at ignition and at acceleration. I found an Italian tune-up worked pretty well clearing it up. Correct Timing. As the idle progresses, the shakiness goes away. If there is excess carbon buildup in the throttle body, this causes the low/rough idle speed. – Pᴀᴜʟsᴛᴇʀ2 ♦ Dec 13 '15 at 19:39. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. It idled smoothly before the cam change, and runs fine now at higher RPM's. Hello all! My name is Bryan and I am new to the site. The one problem I am still having is that the idle still sometimes drops when I am sitting still. Components in the fuel, ignition, emission and other systems should work correctly. cable off for approx. Just had tune up because I thought it would help resolve the problem. When the volage feedback isn't correct you'll get the high revs and/or rough idle. Don't drive the car, or it will get worse, cause more damage, and clog your cat up. Re: 1999 mercury 150 EFI saltwater series runs rough at idle Hello all, Removed injectors and then tested for bleed down and spray, everything was in good working condition, put them back in issue still exist with no difference. They don't know. Basically run it hard through first and second gear hard (keep it in drive) and watch the black smoke fly out the exhaust. rough idling can be cause by many things. It should NOT apply vacuum to the system at idle. I noticed my a/c condenser fan wasn't turning on. A rough idle could simply be the result of an incorrect idle speed setting. These engines are experiencing a problem with carbon build-up on the top side of the intake valves. RPM fluctuate from 615 to 300 and back within 2 second. 4, it has 140K on the clock though. Recently it started to pop and idle rough but when I have it on WOT (wide open throttle ) it seems to run fine. At low revs sounds very rough. This makes them require excess choking (which wouldn’t be so bad if the fast idle ramp was curved better). 0 liter engine, the idle speed should range from 500 to 800 rpm. Bad Spark Plugs. How to clean a throttle body and Idle air control valve (iac). Hello, hope someone can help shed some light on the issue im having with the fiancées car. 6 is at 98k first set of plugs. A: Idle surge is the condition that occurs when something in the ECU idle speed feedback loop fails to operate as expected. p2195 bank 1 lean, p2197 bank 2 lean. I bought my Altima about a year ago and always had a rough idle, it's not so bad now but I feel it and it just bothers me. I added some injector cleaner/ fuel stabilizer stuff (we dont have seafoam here and this was the closest thing I could find) into the fuel tank - bear in mind I am pretty sure this was crap fuel anyway. Cranks but does not start. There is a idle air hose that connects to the idle air control and to the passenger side vave cover. This problem has been getting worse over the last 2 years. As for rough idling, most of the time, it's the iginition system: check your coils, sparks and wires. One of the most common glitches on the BMW E30 3 Series is an erratic engine idle. It's almost like the engine wants to shut down while I'm stopped, but changes it's mind. Re: 2006 ram rough idle Well guys you all have some good info, The rough idle is all the time hot or cold, but the worst after hot pull and stop in traffic or at rest area stop. Checking the Idle Air Control Motor. 2008 VW Polo 1. For instance, sys. modules starts with more entries. In combustion engines , idle speed is generally measured in revolutions per minute (rpm) of the crankshaft. It idled smoothly before the cam change, and runs fine now at higher RPM's. PS> if the thermostat is faulty it can give the engine control module (ECM) a "cold" signal and the injectors will be given a "rich" signalthus a rough idle. Idle speed (or idle) is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. It's not stalling or anything like that. seems like the aircondition. thanks greg. If they are too high, they may warp out of shape, will wear away faster at the tread, and, if high enough, may actually blow out. Hi, about a month back spring in the autolite2100 auto choke snapped. 00 part that is replaced by removing two screws. As much as possible, the result of executing Python code with IDLE is the same as executing the same code in a console window. The belt should be loose in the pulley and resting on the bronze bushing around the hub. Bad Spark Plugs. Idle speed (or idle) is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. My 2012 has developed the rough idle condition after 15K. I got it going again and by pumping the accelerator, I managed to limp home -- had to run a couple of stop signs, though, because it just flat would not idle at all. It's likely you've experienced a rough idling vehicle - which just means the car feels rough and bouncy when the engine is running. I bought my Altima about a year ago and always had a rough idle, it's not so bad now but I feel it and it just bothers me. vt rough idle published by Holden Fan (not verified) on Tue, 13/10/2009 - 09:56 I know it not its not a old Holden but the family wagon 1998 VT idles rough it shakes the whole car it has done 270 000 km I have only ever owned Kingswoods ant have no idea about newer engines. His dumb blonde girlfriend drove the car with leaking antifreeze resevoir. I only have the free version of vdcs and i cant save the new idle speed. While this might not seem like a pressing matter, a rough idle can signal a problem with the car's engine. The gear shifter shakes somewhat and it appears as if the engine is going to die any second, but it has yet to do so. My way around this is to not use my AC and only turn it on while the car is moving, then turn it off when I come to a stop. The engine itself has the most delay from air fuel volume changes to resulting RPM changes. 3L with 100K miles on it. After a while, my a/c would begin blowing warm. I happen to have my service manual here by my computer, so I'll just pass on what it says relative to hunting idle (it has LOTS more to say about rough idle, but I'm reporting on only the hunting idle symptom). The car will feel rough and bouncy when the engine is running. What are some of the symptoms of the code? Symptoms of a P050D engine code may include:. A misfire will cause the engine to momentarily stumble, or lose rpms, and then regain its normal engine speed. Honda Accord: Why Does My Car Idle Rough? Your car is in "park," so why does it want to drive? This article will discuss some of the potential causes and solutions to fix this stubborn car problem. My optimax runs great at anything above idle (idle in neutral, idle in gear, forward or reverse). 0L is becoming more common and getting harder to diagnose. Rough idle and sometimes would experience intermitant hesitation at ignition and at acceleration. The engine struggles to keep it above 7-800 RPM. Is this a TSB issue or something simple like an air filter? The car is a 2005 Magnum SXT with just over 16,000 miles. The knock sensors are under the intake manifold. Idle engine RPM is about 650. car was running great, now getting an intermitent rough idle when coming to a stop. Also engine is very noisy at idle. I have checked the vacuum lines, replaced the EGR, and have a new oxygen sensor. My gen-2 with the 3. 3l and it's idleing really rough, and during an extended idle, 10mins or so, with a/c running it stalled out. The shake/shutter goes away when put in neutral or park. For example, a slight vacuum leak or worn spark plugs are compensated for in memory. Relatively new car - 54km on the clock. I find both hard to believe since the spark plugs are brand new (OEM-spec Champion Platinum plugs) which I've always used and I can't see the ignition coil(s) going bad suddenly. When the engine is started cold, the engine temperature sensor sends a signal to the DME control unit to provide a richer mixture. Rough idling is a common problem, of which the exact cause can be difficult to diagnose, as several factors may come into play. 2 of the injectors were confirmed bad before replacing. it does it wheter it is hot or. Others consider cams in the size range that Vile posted above as having a mild lope. Ive read on other forums and from manufacturer TSB's that the PZEV systems can cause a slightly rough idle. the truck always starts and runs fine. Step 1 - There are several combinations of misfire conditions, steady or random, at idle or under power, which may or may not be detected by the computer and trigger a check engine or service engine soon light, read trouble codes to help pinpoint the cylinder(s) in question and follow the repair guide below. You may have to register before you can post: click the register link above to proceed. It idled smoothly before the cam change, and runs fine now at higher RPM's. I have never lost power, but it has come close. 6 in 12 are 100k plugs, is the 11s different? The rough idle is probably the throttle body needs cleaning. The knock sensors are under the intake manifold. hard shake and idle problem while sitting still. Carbon build up on the intake valves of your VW or Audi 2. Compression figures are perfect and all about 14 bar. Mine would run really, really rough, and cause the whole car to shake. The issue 2. When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. We'll cover the most common causes of rough idle below. A rough idling can occur for many different reasons. My car was running perfectly until I disconnected the negative battery terminal to install fog light bulbs. I recently puchased a 2007 9-5 2. My b230f engine has started to idle rough and has been getting bad gas mileage. The engine has a annoying idle problem that shakes/shutters the car when idleing (in Drive) and stopped (like at a stop light). The Lexus Owners Group is an online community and reference for owners and enthusiasts of Lexus automobiles. When one or more of these variables is off it can lead to a rough idling condition. So here is the deal. RPM fluctuate from 615 to 300 and back within 2 second. Took the truck in had all new injectors installed, new pass throughs, new exhaust manifold (old one was cracked) new turbo installed (old one was cracked). I put it into reverse and this is where it craps the bed. If the white smoke and fuel smell persists even when the engine is warmed up, have this looked at. 3L with 100K miles on it. White smoke is the water/coolant vapors. Finding the problem can be daunting, especially with so many sensors and switching valves involved. He has change head gasket, crank sensor,and got a new antifreeze resevoir. You may have to register before you can post: click the register link above to proceed. A rough idle/misfire usually starts out as being merely a nuisance, but if the causes are not identified and corrected, it may result in your engine not starting, or stopping altogether when you least expect it. The best way to find the reasons for a rough idle is to use an OBD2 Scanner; it can save you a lot of time and money. Re: 2006 ram rough idle Well guys you all have some good info, The rough idle is all the time hot or cold, but the worst after hot pull and stop in traffic or at rest area stop. We can now go into more depth on each of these categories and list the different possibilities. Re: Intermittent rough idle 600 series 5. If I continue to tease it this way I can usually get it to stall. My craftsman lawn mower with a B&S engine, after a pull start, runs rough for five to ten seconds as if having no power (bogging down), but smooths out. This made the idle pretty smooth. To meet idle emissions and gas mileage, Chevy take the idle down to the bear minimum. Car has a rough idle. After a while, my a/c would begin blowing warm. Average repair cost is $800 at 48,100 miles. It is best to try to diagnose and fix a rough engine idle before it gets worse and before it gets expensive!. Very easy takes a couple hours the first time, less once you've done it. I suspect head gasket leak/seep as my coolant is pressurised overnight and understand that head gasket replacement is basically a maintenance item on these cars at 150-175K. What are some of the symptoms of the code? Symptoms of a P050D engine code may include:. Wiki User 03/11/2011. Over the last two years or so the van had developed a rough idle issue. a sudden it feels like the throttle lever is being pulled back down to idle. 5L automatic has a very rough idle while in gear and shutters slightly from idle to 2500 rpm. Re: mercruiser 3. So I looked for intake leaks forever. It is the stuttering portion of the problem I find most concerning because I know for a fact the truck did not ride like that before. The idle of a car engine is kind of like a human heartbeat: You can tell what shape it's in just by listening. No lack in power but just a real lumpy idle you can feel right through the car. Merc MPI engine does not start, idle or is beeping twice every minute An IAC (idle air control) is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The vibration gets worse in drive and reverse but it is still present in park and neutral. Pinch the hose close to the intake piping with hose clamping pliers. Meaning of IDLE. As a result, There can be a variety of reasons for a rough engine idle. Sometimes, vacuum lines cause a rough idle due to a vacuum leak, and these lines are also simple to replace. Repairing engine problems can mean a significant expense, so it's best to have a rough-idling car checked out by a qualified mechanic as soon as you notice the car idling rough. It seems to stutter just off the line and around the 45-55 MPH range the worst. Thinking it's something electrical/sensor. There are few possibilities that can cause switch problems. Re: Yamaha f115 4 stroke rough idle and stall Ok after cleaning the iac valve, testing the tstat, replacing the plugs, and installing new fuel lines and primer bulb. A rough-idling car can be caused by any number of issues. rough idle and cutting out "UPDATED HELP!!" my truck started idling rough after starting and does it a while (hot or cold eng) after starting until i drive 20 min or so it also has cut out twice now in a week i installed an ez @3 weeks ago maybe it??. It idled smoothly before the cam change, and runs fine now at higher RPM's. never does the idle drop and the voltage remian constant though. I have a mate who is a mechanic who experienced the problem and said that a rough idle is usually the IAC valve. The special warranty coverage for this will only cover it if it pulls the right misfire code. This shows you how to fix a high idle, low idle, and or rough idle. This is not a violent shake, but enough to make parts of the dash rattle and be very annoying.