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2001 Mazda 626 Question: cylinder #3 misfire



Arek, Allenton, WI, March 05, 2010, 09:13

I have a Mazda 626 2001 4 cylinder (2.0 l) I have the misfire on the third cylinder. I switched second and third fuel injectors (still misfire on #3 cylinder), I checked the coil (coil is fine), I switched wires to new ones (still misfire on the third cylinder). I'm going to do the compression test for mechanical misfire, but the conditions of my car sound like a lean misfire, could it be just a manifold gasket leak?
My car chokes when I start it and when it's idling it chokes from time to time, not too bad, but you can definitely tell. When I accelerate it disappears. I read about that Long Term Fuel Trim, but I don't really know how to check it or what it actually is. I have my emission test coming on 22 of March and running out of time. Car is old and I don't want to put a lot of money into it. I just rebuilt the transmission in October 2009 and that probably was a dumb decision, cause I pay more for this car now than it's worth. I also noticed that my fuel efficiency went a little down. Also forgot to mention that the spark plug in the third cylinder was blackened, I switched it with the second one, didn't have time to buy a new one yet.
Please help..

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  • Answer #1

    Oakman March 05, 2010, 10:15

    Did you replace the spark plugs as well? And, yes be sure to do a compression test. If you have a lean fuel trim problem, you should have a lean code such as P0171 or P0174. Spray some carb cleaner on the #4 intake runner to check for vacuum leaks as well.,

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