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Misfire code


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ledconcepts
New User

Dec 23, 2009, 2:12 PM

Post #1 of 3 (4644 views)
Misfire code Sign In

I have a 2005 Saturn Vue with a 2.2 liter ecotech. Reading code P0300 random multiple misfire. Has new plugs and coil boots still reads code. Is the ignition module the next thing I should replace?


steve01832
Veteran
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Dec 23, 2009, 7:51 PM

Post #2 of 3 (4631 views)
Re: Misfire code Sign In

Check for spark on all cylinders with a spark tester. If you have good spark all the way around, coils and module are good at this point. Check all of the fuel injector connectors with a noid light to verify injector pulse at all cylinders.
Saturns are having problems with crank and cam sensors. They also have a high failure rate with PCMs. Please perform the tests as I have mentioned and post back with the results before replacing anything.

Steve


Sidom
Veteran / Moderator
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Dec 23, 2009, 9:15 PM

Post #3 of 3 (4627 views)
Re: Misfire code Sign In

In addition to the tests that Steve has mentioned you may want to run a compression test. Run the test while the engine is warm.

If your scanner has the ability to see a data stream, go into the misfire counter and see if one cyl is misfiring more than the rest.


(This post was edited by Sidom on Dec 23, 2009, 9:15 PM)






 
 
 






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