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Old 11-07-2012, 07:23 AM   #1
Gilberator
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Default Misfire cylinder 3

I have a 2004 wrx with 120k on it completely stock. I got a missfire in cylinder 3 a few months ago. I wiped it to see if it would return. It would return in a hundred miles or so. Months went by and I finally purchased my timing kit. On the way home from getting coolant I had to accelerate hard off the ramp on to the highway. Boost seemed fine. I thought I felt a little buck/hesitation previously to that day but I wasn't sure as it was too small to tell. After doing the timing (which was a little off but I got it fixed at the dealer) I took it for a test drive and the car would buck hard when I gave it half throttle or more. Check engine light would come on and off. When it was on it would remain solid for a few days. After a while it just stayed on. Took it to the dealer and they found 6-700 dollars worth of exhaust leaks. Fixed those and the problem persisted. Dealer told me that the car was going into fuel cutout mode because of a bad front 02 sensor. Finally got the front 02 sensor changed yesterday. The dealer said it still had a cylinder 3 misfire. When I got it back the cel stays off but when I give it the throttle cel starts flashing and it still bucks and hesitates. Next step is compression test but I admit I am broke now. Just looking to see if anyone else knows anything of what it could be. I have new iridium plugs that I will install. I just don't think its my plugs that's causing me all this grief. Any help is appreciated.
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Old 11-07-2012, 08:57 AM   #2
codesoccer
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Coil pack?
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Old 11-07-2012, 09:38 AM   #3
Gilberator
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Think so? I just figured that wasn't it because it idles fine when warm. I thought a bad coil pack would mess with the idle as well.
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Old 11-07-2012, 09:39 AM   #4
codesoccer
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Quote:
Originally Posted by Gilberator
Think so? I just figured that wasn't it because it idles fine when warm. I thought a bad coil pack would mess with the idle as well.
Nope, not always. I had a bad coil pack that only affected WOT.
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Old 11-07-2012, 09:41 AM   #5
codesoccer
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Also changing the plugs is one of the first things you should have done because its cheap and easy to rule out.
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Old 11-07-2012, 10:34 AM   #6
Gilberator
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Okay will do thanks. Im doing the compression test this weekend so ill swap out the plugs. I believe I checked my packs when I did the timing and didnt see anything. What should I look for in a bad coil pack?
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Old 11-07-2012, 12:16 PM   #7
codesoccer
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I don't believe it's something you physically see but I'm sure someone more knowledgeable will chime in. You can however, switch coil packs with another cylinder and see if the misfire follows.
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Old 11-07-2012, 07:47 PM   #8
frederik
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I am in the middle of diagnosing some issues with mine, one of which is bucking at WOT at aroung 3500 rpm. Almost every time.

In my case the problem was solved after changing plugs. I also fixed a leak at the maf at the same time (e o-ring on the maf was partially torn apart) but I dont think it is the maf that was causing the bucking because I still had the bucking when I swapped it for a known good one.

But you can still try cleaning or swapping the maf for a good one (borrow it from a friend), changing plugs, and also fuel filter.
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Old 11-08-2012, 07:59 AM   #9
Gilberator
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Thank you both. I also read that misfire faq. I was reluctant to start a thread but I have been searching for days and I figured I could try and get answer that pertains to my situation. Ill swap packs and see if that does anything. The weird thing is that right after I did my timing, it really started happening. Went to get coolant that morning, no problems accelerating. Went to test drive the car after the timing belt installation, bucking hard. Dealer fixed my timing though so I guess I just have to keep going through the steps. bah I hate misfire codes. :/

Last edited by Gilberator; 11-08-2012 at 10:00 AM.
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Old 11-16-2012, 01:50 PM   #10
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Changed the plugs, cars back to normal. Thanks for the support. I feel like such a dumbo, just figured it couldn't have been that. I was wrong haha.
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Old 11-16-2012, 05:24 PM   #11
codesoccer
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Quote:
Originally Posted by Gilberator View Post
Changed the plugs, cars back to normal. Thanks for the support. I feel like such a dumbo, just figured it couldn't have been that. I was wrong haha.
Glad you got it all figured out. Be thankful it was something simple.
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