Misfire issues - Mustang Evolution

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Old 09-28-2011, 05:19 PM   #1
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Misfire issues

So this story has a bit of history.....when I bought the car there were no issues (bought in July this year) with it, about couple weeks later it developed a slight misfire. within a week from that it got a lot worse. Once it got worse it turned on the CEL so i took it to autozone to get the code checked. P0103 - Cylinder 3 misfire and also misfire in the first 1000 revolutions. Took it to the dealership and they wanted to say it was the MAF sensor and that it wasn't covered by my waranty (they wanted to charge me 400 bucks too...) i'm no certified mechanic but even i know that the MAF sensor will not cause cylinder 3 to misfire.....it would make the WHOLE car run like crap.

So i start talking to my buddies (some mechanics some not) and have been getting ideas like:

coil pack
Head Gasket
Dead cylinder
Valve gasket
Exhaust gasket
injector wiring

I changed the plugs, and it got better, but not gone. Moved the wires and the misfire didnt move. Its not the coil pack (itsnot CoP) because its paired cylinders and 3 AND 5(or 6, whichever is paired) would both have issues. Thats all i have been able to narrow out so far. About 2 weeks ago i did a Seafoam treatment. While i was doing this i noticed that the engine started to smoke (like it does out the back) out the right side. (the number 3 side) There was no smoke out the drivers side. There is no colored smoke out the back that i notice (so not burning oil) and i cant tell if there is a sweet smell to the exhaust (for burning coolant) and i dont notice an exhaust smell in the engine bay (exhaust gasket) and after the seafoam treatment the misfire goes away for about a day and then starts to come back and gradually get worse till it throws a code again.

I'm truely stumped on this and i'm really trying not to spend a ton of money replacing everything i THINK it is...so i'm hoping someone can help me narrow it down a lot better because i'm somewhat irritated by it.

any help is GREATLY appreciated
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Old 10-02-2011, 12:52 AM   #2
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Re: Misfire issues

Faulty c.p.s i dont think that's too common but it can cause some missing a good sign would be poor fuel economy assuming the car is well taken care that is.That wouldn't explain the smoke thing though another possibility could be the T.P.S. these are just two suggestions not on your list hope this helps and you get it figured out
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