The Good Ol P0340 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 1 (permalink) Old 07-31-2016, 07:38 PM Thread Starter
Join Date: Jun 2014
Location: Lake Isabella
Posts: 19
The Good Ol P0340

Long story short the car had been running fine the clock just passed 124k I was driving in about 113* weather and I started running on only a couple cylinders. As it happened I remembered hmm I remember a similar issue with my old dsm and after tons of diagnosis found it was a bad coil I let it sit much like my old dsm and after an hour I started it up and continued home. I replaced plugs just hoping it was the fouled plugs but it came back again on the next super hot day. I then ordered new coil set up and installed it to find a nice code for the cat inefficient which I figured was from the cyl dumping fuel with out spark messing up the cat. I drove it for about an hour highway speeds to work and it popped a code I figured was for the cat but I scan it and now I have the cam sensor code. after research I find that I don't have a cam sensor that it monitors the crank sensor and two spark plugs to generate the signal. So with all of that can I assume I have either a bad crank sensor or fouled out my plugs again? and is there a way to determine it?
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