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running rough

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Question
Car starts, idles rough, stalls when accelerating past 2000 rpm.
The odor of gas is due to misfiring. Check engine compression and check for any exhaust restriction preferably by measuring exhaust back pressure but you can also infer exhaust back pressure by testing engine vacuum. If compression is good and...
Question
2005 Chrysler 300c has a code P0406. I believe EGR needs replacing, Don't know if it will make it 25 miles to dealer.
P0406 involves the EGR system but that may or may not be the only factor causing your rough running condition. Typically, P0406 will set if you have a failed EGR valve, excessive carbon buildup, an open or short in the...
Question
06 Ford 500
The engine should be scoped to evaluate the secondary firing patterns. That will provide an important clue. Apart from mechanical possibilities such as a blocked exhaust and/or loss of compression, what you are describing is due to an ignition, fuel...
Question
My 06 cyshler 300 base idles bad in drive when stoped but drives good when moving
It is possible that diagnostic trouble codes have set and a mechanic should attempt to retrieve those codes first using an appropriate scan tool. When the engine is cold, the engine coolant temperature sensor must be working properly to signal...
Question
rough idle
The downstream sensor is irrelevant insofar as the running condition of the engine. All the downstream sensor does is monitor and report the efficiency of the catalytic converter. The downstream sensor has no role in adjusting the air fuel ratio...
Question
Why does my car shut off right as I am parking and it runs rough 2000 Nissan Altima
Hi there. It sounds like you either have some sort of vacuum leak or possibly an engine misfire. I usually start by checking to see if the check engine light is on and if it is then I scan the...
Question
04 cvpi started running lean after changing spark plugs
Check to make sure the plugs are tight but do NOT overtighten them. Use a calibrated inch pound torque wrench only; if oil is on the spark plug threads, request assistance from a mechanic in tightening the plugs because the...
Question
Engine running rough and overheats while in slow moving traffic or long stops.
Hi there. You need to first see why it is running hot. Typically it is caused by a failure in the radiator. These are notorious for clogging internally. You would then need to do a compression test. Most of the...
Question
Why would my 2003 Chevrolet Impala stall and now it runs rough.
Hello. Though there are a lot of things that can cause this typically it is due to an issue with a failure in a spark plug or an ignition coil failure. If there is not a check engine light on...
Question
Why does my Mini Cooper rev and shakes when I am stopped at a red light
Hello. This can be caused by a number of things. Since the check engine light is on you more than likely have a misfire or a faulty sensor. I would usually start by scanning the computer for codes to see...
Question
Can you inspect the engine for unstable rpm, with the misfiring OBD code deleted 2011 Chevrolet Camaro
Hello. Yes, you can use a scan tool to see if there are misfires and where they may be in the engine. In a lot of cases the code history can also be found if that was not erased also....
Question
What would cause a vibration at idle in my 2000 Mitsubishi Eclipse
Hello. Most of the time if the mounts are new and it still runs like this it is because you either have a vacuum leak or the idle is too low. A dirty throttle body or a failing idle control...
Question
My 2003 Mazda Tribute stalls in gear, no power, rough idle, not the plugs, oil fouled black, clean maf and idle air valve
Hello. I would start by scanning the vehicle for codes and checking to see if all of the sensors are reading correctly. If everything looks good then chances are it needs a new computer. I have seen the computers fail...
Question
My car twice out of 4 times today would not start on the first time. Second time started fine. At 2 read lights it was sort of je
Hello, thank you for writing in. Your symptoms point towards an issue with fuel or spark. If you just had work done on the fuel system, you may wan to have your fuel pressure tested at the engine. This will...
Question
Car idles rough with AC on - 2008 dodge avenger
Hello, thank you for writing in. There can be multiple problems with the vehicle causing your issues. First, we need to take a look at the drive belt which sends power to the AC system from the engine. When the...
Question
Fuel burns and car jumps when stopped
Whatever is causing your car to run rough is probably also causing it to drink gas. Look under the hood for any vacuum lines that may be off or in bad condition. It's surprising how many problems you can solve...
Question
starter
Hello, thank you for writing in. Even without a check engine light, there may be codes present that will help with this. Scan the vehicle for codes first, and use any present to help guide you. The noises you are...
Question
Car jerks and seems to downshift if i take my foot off the gas over 60mph.
This sounds like the engine is surging from a lean condition. This could be from the add on computer program and exhaust. If you have the programmer then I suggest you set back to factory program and then see if...
Question
I have a 2008 Honda Odyssey and 3 weeks ago my CEL came on and the van started vibrating while idling.
Hi there. Since the check engine light is coming on I would have to scan the computer for codes to see what is happening. It sounds like you may have an intermittent issue. Most of the time this is caused...
Question
Car stumbles at idle but fine when drive or push gas peddle
Hello, thank you for writing in. There are a huge number of components that can contribute to a rough idle. Always start by scanning the vehicle for diagnostic codes regardless of a warning light being on. If no codes come...

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