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Old 11-01-2019, 05:59 PM   #1
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Default flashing CEL under WOT, jerking-stutter, white smoke

Car is a 99 forester with an 02 wrx engine stage 2 tuned ebcs

Hey guys, my cars been driving beautifully up until this afternoon when I tried opening it up on my way home it started jerking/stuttering under acceleration but it still had power, the first time I didnt get a flashing CEL but the second time it flashed for about 15-30 seconds until I came to a stop. When I went to start driving again the flashing CEL went away. The car drives perfectly normal when not under heavy load, I can even give it some boost and it will act normal. I drove for about another 45 mins with no other hiccups but also not going into wot. When I got home I noticed that there is some white smoke coming out of the exhaust (not a lot but enough to notice., but it doesnt smell sweet or anything, smells more like what I would describe as bad gas or something. The only thing of note is I have been slowly losing coolant for a couple months now but the oil is fine and this is the first time I've seen white smoke. Also the weather got pretty cold for the first time last night but the car seemed to be running fine this morning. Does this ring any bells for any of you? I've been reading and it sounds like possibly bad spark plugs/coils or bad gas, not sure how the white smoke ties into this though. Any help or guidance is appreciated.
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Old 11-01-2019, 06:40 PM   #2
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also wanted to mention it has tgv deletes and full turbo back straight pipe. I just check the coolant and it looked good. The smoke didnt come back. Gonna go ahead and replace the plugs and coils tomorrow as well as put some injector cleaner in the tank. Ill update then.
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Old 11-01-2019, 06:51 PM   #3
snow_bound26
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Injector cleaner won't take care of bad gas if that's the problem. Have you check for the code that's stored on the ecu? Might tell you something g. Description made me think maybe some water in the gas. There's stuff you can get specifically for that at any auto parts store. But I'd check the stored codes and see if anything pops up
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Old 11-01-2019, 06:58 PM   #4
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Yeah the CEL went away while driving it, I'll see if its still stored on there tomorrow but I'm guessing its not. I was thinking of doing the injector cleaner just in case one was dirty and was causing this issue. It almost felt like fuel cut when I was WOT today. I'll look into that bad gas stuff too when I go to the store. Thanks for the response.
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Old 11-01-2019, 07:48 PM   #5
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If an injector is that dirty it would need to be sent out for a proper cleaning. Injector cleaners are meant to be used every few thousand miles as a preventative, not to clean one that is already too far gone
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Old 11-04-2019, 09:27 AM   #6
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Coil packs that are on their way out will definitely exibit their weakness under load more in the cold/as it gets colder. That's a super easy fix, if you're lucky.

Read the code and narrow it down to which cylinder is misfiring. You gotta start some sort of process of elimination.
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Old 11-04-2019, 05:02 PM   #7
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replaced the coils, 4 for 70 on amazon instead of 110 a piece from autozone, they had good reviews so I risked it. Also got new NGK plugs, they guy said they were pre-gapped but they were gapped at .040, glad I checked because I think the last plugs were overgapped as well. The stutter/jerking has completely gone as well as gain in 10hp it feels like. I wish I would have done this sooner. Again thanks for the responses guys, hope this helps someone else out in the future.
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Old 11-06-2019, 09:46 AM   #8
Shik
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Good deal! Coil packs start going bad even before you really notice it. They should be considered preventable maintenance and just be replaced if your engine has 100k miles, maybe even sooner. Hardly anyone ever does though.

Amazon coil packs sketches me out a little, but I'm a sucker for new oem parts. As long as you got it going though!
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