Cylinder 1 Misfire, please help

[Chopper8176]

Bockwoldt, swapped spark pluggs in cylinder 1 and 2, and swapped coil packs on cylinder1 and 3. Engine light shut off, it will be on after a while. Will run engine code again. Thanks, will keep updated.

 

[YelloEye]

Survey says?

 

[Chopper8176]

Rechecked codes, they were p0301(cylinder 1 misfire) again and p0300 (random misfire). Still thinkin injectors. Just curious to see what advise anyone can give for my next step to finding the.problem ?

 

[YelloEye]

Run a bottle of Chevron fuel system cleaner concentrate through it next fill-up.
http://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E
Make sure it's the concentrate, it's what GM previously used before they switched to their own brand.

You can get it at their stations or most parts stores.

 

[bockwoldt]

Try spraying some carburetor cleaner around the injector. If you hear the engine RPMs increase, or a sucking noise, replace the o-rings. If there is no leak, try moving the injector from cylinder 1 to cylinder 2. Make sure you're careful with the o-rings so they don't rip during the move. If the code comes back to a P0302, then you know it's a bad injector.

 

[Chopper8176]

Yellow eye, I used the chevron fuel addictive. Still have the same results, engine light goes on and off, mostly during higher RPMs and when engine is working harder. I have used that product several times on the cobalt and my gmc sierra.thanks.
Bockwoldt that was my next step, to swap injectors. I will also do the carb cleaner test around the injectors.

 

[bockwoldt]

Here's a good article about the 2.2L motor and misfires Check Engine Light P0300 Misfire At Idle- 2.2L And 2.4L
Are you having a rough idle or is it not really noticeable? Keep methodically working through the problem. Hopefully it's not a bad exhaust valve......

 

[Chopper8176]

Okay, switched around 1 and 2 cylinder injectors tonight. Cleaned all of them up with carb cleaner. The car doesn't have any hesitation, don't notice any major power loss, starts fine. However I have noticed it uses a bit more gas than used to. I sure hope it's not a valve either. Will post results again.

 

[Chopper8176]

Okay, CEL came on again. Got code pulled, misfire still in cylinder 1. Have swapped plug, coil pack, and injector. Suggestions?

 

[YelloEye]

So that leaves you with:
Valves
Valve seats
Piston head
Piston rings
And wiring connecting to that coil

Done a compression test?