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code for misfiring cylinder

 
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Old 02 Jun 2010, 12:55 pm
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Default code for misfiring cylinder

I have a question. I have a 2003 PT cruiser (non turbo). I have a code p0301 which is cylinder 1 not firing. I have changed the plugs, wires, thermostat, coolant temp sensor, and have switched the fuel injector from cylinder 1 to number 2 and i still have gotten a code for cylinder 1. if anyone has any ideas i would greatly appreciate the advice.
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Old 02 Jun 2010, 02:46 pm
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Default Re: code for misfiring cylinder

You've replaced everything that I found in a search for a single cylinder misfire but I have to ask if you checked the old plugs really good when you took them out? If the No#1 plug was excessively oily you might have an internal problem.
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Old 02 Jun 2010, 03:05 pm
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Default Re: code for misfiring cylinder

there was no oil on the plug, we also have recently had to replace the timing belt and had the head machined, replaced the valves and all the upper gaskets. i just cant figure this one out. could it be the coil pack? I have never heard of a bad coil pack affecting just one cylinder.
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Old 02 Jun 2010, 03:13 pm
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Default Re: code for misfiring cylinder

Correct. If a bad part of the coil pack, two cylinder are affected. Sounds like something wasn't done right with all the work that was done. You might have to hook it up to a scanner and also look into a pressure check of the head to see if No#1 cylinder is up to spec of the others.
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Old 03 Jun 2010, 08:18 am
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Default Re: code for misfiring cylinder

Does it idle rough?
Could be intake gasket - usually the lower one, and usually # 4, but # 1 isn't unheard of.
You swap wires between 1 & 4 & see if it moves?
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Old 08 Jun 2010, 11:59 am
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Default Re: code for misfiring cylinder

thanks all for the help i ended up taking the plug out again and found it was gapped at 50 while the others were gapped at 45. after i regapped the code went away and the car is running fine. seems odd that that little bit of difference could affect the car that much
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Old 08 Jun 2010, 01:50 pm
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Default Re: code for misfiring cylinder

.040 should be the correct gap. The sticker on your hood MAY say .050, BUT .040 is the new spec for the gap.
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