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I have a 02 wrx that is misfiring like crazy but when I hook it up to the comp it has no misfire codes. Anyone ever happen to have gone through this? I would hate to have to replace each coil pack just to see if thats even the problem. Plug are all brand new. Mass air flow seams to be goood. This started to happen a week after replacing the rare tumble sensor so I checked the rubber tube around the turbo for leaks, can't seem to find any. Any thought would help.
 

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Discussion Starter #3
No plus have been in for a month or so.

I have pulled each coil pack and and all plugs. Nothing is burnt out. Had the car run and unhooked each coil plug one at a time to see if it stayed the same or got worse. I got no where with that. Checked the mass air flow, that was good. Took off the filter and drove it down the door yard and back up, that did seam worse. Re-plugged it into the computer and no codes came up that would represent a misfire.
 

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Are you sure that the rear tumbler is hooked up correctly, or that the correct part was installed? I know that has caused misfires before, and sometimes on reinstallation the connectors have been broken. There isn't a lot of room to maneuver in there. Being that it started just after the sensor was replaced, that's where I'd look into the problem first.
 

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are you sure its missing and you dont have just a rough idle? Do you have access to a decent scanner so you can take the car on the road and record a data stream under load? What happens if you tap on the MAF with the car running at idle? does the idle change? Did you put stock same heat range plugs back in the car? How many miles are on the car? Check all of your vacuum lines, spray some 2+2 gum cutter around your intake gaskets and vacuum lines with car running and see if the idle changes. Your CEL bulb isnt burnt out is it? It does come on when you have your KOEO ( key on engine off ) right?
 
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