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Q: Check engine light illuminates steadily on 2007 Saturn Ion

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I own a 2007 Saturn ION 3. Within the last few months I have noticed the my check engine light would come on. Sometimes it would stay on and then go out, and other times it would come on and stay lit steadily for several days. The light happened to be on when my Onstar diagnostic service indicated a problem with the 3rd cylinder misfiring. The following month, the light happened to be out when Onstar performed an engine diagnosis with no problems. The light came on again and stayed lit constantly for several days, so a finally took my car to a shop for remedy the problem. The shop owner confirmed that the 3rd cylinder is misfiring, but nobody at the shop could figure out what was causing it. Ever since my car was returned to me, the light would sometimes go out, come on, and than go out again. At present the check engine light is on steadily, and hasn't gone out. Could anyone out there in the repair community tell me what could cause the 3rd cylinder in my 2007 Saturn ION 3 to misfire and what I need to do to fix it?
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Have your shop switch coils with another cylinder and see if the missfire moves to that cylinder.Also look at freeze frame when pulling the code,it could help narrow it down.And last find a shop that is good with a scope to look ignition and injector patterns also in cylinder pressure pattern.Try also switching spark plugs.
I had a coil die on me while driving once. When I replaced it with one from my parts car, I discovered something extremely valuble!!!! My car was a 1996 Saturn SL2. Parts car was 1997 SL1. Both have the same coil. And both had a ton of oil and dirt built-up between the coil and the engine block. I now have another 1997 SL2. Just bought it, only has 86,000 miles on it. It was starting hard. The odd thing was, it would start rightup after I would just turn the engine over for a second or two. It would also start easily after it was just shut off. I took off the coil tonight and found oil and mud. took it off cleaned it in the kitchen sink, PROBLEM SOLVED !!! Cleaning the coil should be part of routine maintenance for everyone. And, if you have a leaky Valve Cover Gasket, replace it ASAP. I will be doing mine today.

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