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running rough

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How Long Does a Timing Chain Last?
A timing chain is a metal chain, as opposed to the timing belt which is made of rubber. The chain is located inside of the engine and needs to be lubricated by...

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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
My car is running a bit rough after jumping it off what can I do to fix it? 1998 Pontiac Bonneville
Hello - your symptoms suggest multiple possible problems from higher-mileage classic like your Bonneville. It's possible that your engine has "jumped time", meaning that the timing gears and chain are sufficiently worn that the the timing chain jumped a tooth...
Question
My car idles rough at stop lights.
There are a couple of things that may cause this situation. A clogged engine air filter or dirty throttle body may not allow the proper amount of air to flow while the engine is idling and cause a low, rough...
Question
Vehicle is running rough.
If the vehicle starts to act up at operating temp, you may have an issue with the idle air control valve. These will typically get gummed up and some vehicles may have a hard time starting when cold or act...
Question
Started idling rough then stalling at traffic lights after about 20 minutes of driving. Replaced fuel pump, fuel filter, and spark plugs.
Try flushing out the fuel system with a fuel treatment. You may have to remove the supply fuel line and blow out the line with air pressure to clean out what could be blocking the line. Check all of the...
Question
Hello. I have a 2001 Ford escape XLT 3.0. It has been sitting for almost 4 years with the thought of having a blown head gasket.
Check the crankshaft position sensor and see if its not working properly or if the harness is broken. If the sensor is working fine, then check the ignition coils and see if there is an voltage to the primary circuit....
Question
My sl600 V12 has 161,000 miles. Do I need to replace the ignition wires?
If you suspect that the engine is misfiring, you should identify and resolve the cause now because misfiring can cause lots of collateral damage such as plugging up the catalytic converter. Misfiring also wastes lots of gas, has the potential...
Question
have a 98' Honda Civic Dx with manual transmission that's got some sort of issue. Most of the time it runs just fine, but randoml
Hello, thank you for writing in. Although the parts you have replaced are the key components, you are going to be more worried about the air intake, throttle, and idle air control valves. The idle air control valve keeps the...
Question
Is it bad to drive a car that needs a valve adjustment?
Hi there. If the valvetrain is out of adjustment or the lifters are stuck and making a tapping noise on the top of the engine, then that could damage the engine when driven. I recommend changing the engine oil and...
Question
Rough in morning. 0 compression. after heats up runs okay to 100 compression. in 3 cylinders only on a Miata 2004.
Your engine has morning sickness. There is no way for the engine to have a 0 compression as the engine would not start, so there has to be at least 60 pounds of compression to ignite the fuel. The issue...
Question
Car rough idles sputters and jumps rpm after changing ignition coil cap and rotor.
Check the spark plug wires on the distributor and on the engine. It seems that you have one or more wires crossed and the engine is firing on the wrong stoke causing the engine to run rough and make the...
Question
Running really rough, not starting usually. Battery light came on. Car overheated. Headlights turn off when I put the high beams on.
Hi there. With the information given, it sounds like you accidentally put 3 bottles of Gas Heet (water / antifreeze remover) into the gas tank. There is to be only 1 bottle of Gas Heet to a full fuel tank...
Question
What does my car start shaking when idling 1997 Ford Taurus
Hello. This can be caused by a number of things. Most of the time the issue is caused from a vacuum leak in the engine or a failure in the idle control valve. This is only true if the issue...

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