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Misfire CEL

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Old Nov 3, 2007 | 04:22 AM
  #21 (permalink)  
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Originally Posted by im2wrxy
Exactly..thanks Jeff!

I want to get the pressure issue fixed first and then we can get together and see if we can work this out. I'm going to swap my inlet tomorrow and check the up pipe gaskets, clean my MAF, and put one step colder plugs in and we'll see what happens.

Here's what I know. the car does not like the plugs gapped at .030 at all. the code comes back within minutes and the car noticeably misses. It runs best with plain old copper Autolites; platinums and iridiums make it worse. So, I'm going to put the one step colder copper Autolite plugs in but increase the gap...maybe it will clean up some of the firing issues.

I'll post again tomorrow when I get done. Oh BTW, whats the best way to clean the MAF?

Craig
they sell a special cleaner just for MAF's. i got mine at Pep Boys. its made by CRC. just spray the MAF down and let it dry.

hopefully it will fix your headache.
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Old Nov 3, 2007 | 05:57 AM
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and you'll want to decrease the gap...try .024
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Old Nov 3, 2007 | 07:13 AM
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remember when this happend to me jeff! it ended up being my front mount pipe coming apart!!! ugh....
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Old Nov 4, 2007 | 03:27 AM
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Well, heres the deal. I THINK I may have conquered this animal. Yesterday I replaced the inlet, cleaned the MAF, checked all the up pipe/down pipe connections, checked plug gaps one more time (decided not to put the one step colder plugs in until I found the problem...didnt want introduce another potential contributor), and replaced all fluids with Royal Purple (not that it had anything to do with my problem).

I did a pressure test. It held 20 lbs for 30 minutes. I never thought that would happen but it did. I'll try and post pics of the stock inlet. When my moron mechanic put it back on he folded the bottom where it connects to the turbo under and then clamped down on it. By the time I got to it, it was basically shredded on the bottom.

After the test I cleared the code and took it for a 15 minute test ride under as many different driving conditions as I could put it thru. The code never came back and it ran much, much better. Throttle response was greatly improved and boost didnt tail off hardly at all. I was extremely happy. I'm still a little worried the CEL will come back but this is as best its ran in a long time. No hesitations at constant speeds/deceleration and almost no lag at all.

So, we'll see what happens. Lately the CEL would come back on within 5 minutes of clearing the code so if nothing else its an improvement. Thanks everyone for your input, I appreciate it.
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Old Nov 4, 2007 | 06:07 AM
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hopefully you got it !! great news
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Old Nov 5, 2007 | 04:42 AM
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GUESS WHAT? IT'S BACK!!!!

This time its different. The CEL blinked and then held steady immediately during a cold startup. The problem before always occured when the car was hot and it never blinked.

I have no idea what the code is, I havent had a chance to make it to Autozone to get it read. The car still runs fine, so I'm assuming its the same issue.

Back to the drawing board...
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Old Nov 5, 2007 | 04:53 AM
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Originally Posted by im2wrxy
GUESS WHAT? IT'S BACK!!!!

This time its different. The CEL blinked and then held steady immediately during a cold startup. The problem before always occured when the car was hot and it never blinked.

I have no idea what the code is, I havent had a chance to make it to Autozone to get it read. The car still runs fine, so I'm assuming its the same issue.

Back to the drawing board...
its like a virus that never goa away. i got most of mine during cold idle. car always ran fine with the code on or off. its just damn annoying to have the light on
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Old Nov 5, 2007 | 04:57 AM
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Originally Posted by -faded-
its just damn annoying to have the light on
You got that right man, it's REALLY ANNOYING.
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Old Nov 5, 2007 | 06:16 AM
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im right there with ya my codes are poping like crazy today mine came up under the slowest driving condition shift at like 2400 and a code popped up im on the 2.5 hybrid so dont feel solo in these problems
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Old Nov 5, 2007 | 06:18 AM
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P.S. are you having any rough idle problems my car is shaking like a wet dog at stop lights and im tired of it
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