AAUUGGHHH...Engine keeps misfiring!! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-14-2007, 11:39 AM   #11
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Is there a way to test the coils? I did have a lot of corrosion where the #4 wire connects to the coil.
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Old 03-14-2007, 11:47 AM   #12
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How to test the coils is in techinfo. Rusted posts on the coils (usually just one) is fairly common. Clean it off well with emery cloth or steel wool, then apply dielectric grease. Clean up the plug wire also. Personally, when they corrode like that, I eventually just replace them.
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Old 03-14-2007, 01:14 PM   #13
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Well I went to the dealer and had them read the code that just came up:
DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
He said this would make it run like it is. He was able to manipulate the computer to make the problem worse and 'better'. He said the EGR is good so it may be just carboned up. I am going to clean that out later. Should I get the gasket for it? I am thinking yes, but do not know if I could get away with it. I think I am on the homestretch!!!
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Old 03-14-2007, 02:21 PM   #14
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If you remove the EGR, replace the gasket.

Hopefully that will solve your problem
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Old 03-14-2007, 02:25 PM   #15
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I would bet that once you remove the egr and inspect the pin and try to move it in and out it is carboned up and will not move to freely like it is supposed to.

Like I said just clean the **** out of it with some carb cleaner and wd40 and replace the gasket and hopefully it fixes your prob!
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Old 03-14-2007, 02:34 PM   #16
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Also I know from my own experience that excessive vacume in the motor can also cause a false egr code to be set off.

One way to tell is if you remove the oil cap while it is running and there seems to be alot of excess vacume then that could be your problem also!

Like I said earlier that once I had a egr code and it was being caused by to much vacume, being caused by the o-ring being not there on the pcv valve.
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Old 03-14-2007, 05:07 PM   #17
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AHHA!! I have found my problem. I removed the EGR and cleaned everything out, reassembled and started the car. No fix. I had the can of carb cleaner and the one spot I never tested when looking for vacuum leaks was the flexible tube that connects the EGR to the manifold. I remember putting that back on and wondering if it cracked. Apparently it did! I sprayed that and the idle went all to hell!! I am going to check out alldata and find a part number for this. Does anyone know where I can get one. I know you guys that are always taking you car apart deal with this Thanks alot!
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Old 03-14-2007, 06:59 PM   #18
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PM Archon, he can get you the GM part number.
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Old 03-14-2007, 07:39 PM   #19
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I went ahead and ordered the part from GM. I wanted to use GMpartsdirect but by the time you pay shipping, it is the same price as the dealer I smell a conspiracy :P Anyway, when I do this, do I have to remove the throttle body again? If I do, since I just replaced the gasket on the TB, do I have to replace it again?
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Old 03-14-2007, 11:34 PM   #20
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Check your ignition switch, i couldnt figure out why mine was misfiring and it was the ignition switch
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