what is causing my cylinder one misfire?

Asked by May 26, 2014 at 09:58 PM about the 2006 Chevrolet Cobalt

Question type: Maintenance & Repair

I own a 2006 chevy cobalt it has around 130k and never had any issues, only routine oil changes. I had a ignition switch recall called on my car, a day after hearing of the recall, i was driving on the highway going around 75 mph, my car stalled, i started it back up and drove it off the highway and to a gas station, it had make some thumping sounds, after turning my car off, i couldnt start it back up again, it turns over but there was a loud thumping, almost like a knock. My check engine light had come on at this point. There is no fluids leaking, and had no smoking. My car turns over but sounds horrible, it will not drive. I took my car to a gm dealership to allow them to fix the recall, during the recall fix they ran a diagnostic test and it showed i had a cylinder one misfire. Im not sure what could be causing this issue, but i know i dont want to spend a whole lot of money. I have a few things in mind that i have thought it could be, but i need a second opinion.

12 Answers


http://www.obd-codes.com/p0301 -- check this out for possible causes and solutions. But the thumping has me scratching my head. Have you checked your oil and coolant levels?

3 out of 3 people think this is helpful.

My boyfriend really handles most of it , but we are scratching our heads too. & yeah everything is fine. We were thinking a bad spark plug or coil pack- thanks.

but i just wasnt sure if it could be something else making that noise, cause it sounds pretty nasty


The sound you heard may have been a timing issue,maybe jumped a few cogs,would explain sudden cut off at 75 mph.and misfire on #1., Come on DANDY think>>: )

4 out of 4 people think this is helpful.

From what I am finding about your engine it is an interference engine. Meaning that if timing chain jumps time the pistons can come in contact with the valves. A bent valve would cause a misfire and possibly a knocking sound. I would do a compression check on all cylinders. Any cylinders showing 0 psi will have bent valves.

3 out of 3 people think this is helpful.

There you go dandy : )

3 out of 3 people think this is helpful.

Also finding where some of these have what is described as a timing chain tensioner rattle.

1 out of 1 people think this is helpful.

http://www.chevyhhr.net/forums/how-tutorial-library-21/timing-chain- tensioner-replacement-fix-engine-rattle-46159/ -- check this out. Video on here of a minor rattle sound. See if it kinda sounds like yours

2 out of 2 people think this is helpful.

Ok topshadetree. I a little slow some times. Lol.

1 out of 1 people think this is helpful.

you pretty good,your rating is #3 : )

3 out of 3 people think this is helpful.

but im coming : )

3 out of 3 people think this is helpful.

yes. You give good answers. You will climb fast.

1 out of 1 people think this is helpful.

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