Skip the auto shop - Our mechanics make house calls

Q: misfire in cylinder #1

asked by on

I've had this mis fire for a while now, even after replacing the spark plugs, spark plug wires, distributor cap, coil pack, and fuel injectors. And it will every once in a while idle ruff on the start or have issues not wanting to turn over, and some gas has to be given until it doesn't want to shut off.Also, every once and a while (once a week probably) it will shut off at a light or stop and sometimes while driving. It seems when the jeep warms up it runs better. Please help I don't know what else I can do to solve this. Thank you

My car has 200000 miles.
My car has an automatic transmission.

A: It is possible that your number one cylinde...

It is possible that your number one cylinder could be misfiring due to low compression in that cylinder. I would recommend having a compression test performed by a qualified mechanic to determine if the piston rings are holding up to the compression that they are exposed to. The manufacturer releases a compression specification that this number will be compared against.

If the compression is low in the number one cylinder, the piston rings may be faulty and need replacement or the cylinder walls are far too worn down due to lack of lubrication and are no longer able to hold compression even with good rings. In this case, the engine block would likely need to be bored out slightly and replaced with larger pistons or a new engine would need to be installed.

At 200k miles, it is not uncommon for a cylinder to lose compression due to piston ring failure. Engine blocks being too worn out is an unlikely cause, but is still possible. I would also check your exhaust for white smoke. If you have white smoke coming from your tailpipe (even intermittently) this means your engine is burning oil and could be an indication that your compression in one of your cylinders could potentially be low.

I’d recommend having the vehicle checked out by a qualified mechanic who can diagnose your misfire firsthand to pinpoint the fault.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car difficult to start, wants to die

Usually when a car is misfiring and running rough, there are a few different things that could be the cause. If the vehicle doesn't have enough air when starting or driving, the vehicle will want to misfire or stumble, there...

Q: I have to push the accelerator when I crank up my truck up to keep it from turning off

Depending on the engine maintenance that has been done on a regular basis you may need to have a diagnostic check done to check the condition of the ignition system, fuel system, and the computer sensors for an issue like...

Q: crankshaft position sensor problem

No it will not work. Do not try and install it since it will not fit or work. If you start a quote for a crankshaft position sensor replacement with YourMechanic, the right part will be found for your Jeep....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.