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01-05-2013, 07:28 PM | #51 |
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re-examined the work that was supposed to be done to those valves. This picture was taken after the heads came back from the machine shop. Anyone see that all the valves look to be burnt/dirty? At least 4 of those valves were supposed to be replaced. I have the shop that i took it to calling up the machine shop to see what happened and why they weren't replaced.
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02-11-2013, 07:40 PM | #52 |
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Curious if anyone can point me in the correct direction. I currently have a 04 WRX running all the stage 2 goodies. 6 Months ago it got all new timing set, fuel filter and the works.
3 days ago, while driving home, it started to misfire under boost. It didnt do it the first half of the drive but started acting up closer to home. Went through some of the things on this list and that had been reccomended from others and put in a new fuel pump and NGK Iridium IX plugs (.030" gapped). It has helped but the problem is still there. Before it would start to misfire anything over about 10psi, now with the new plugs and fuel pump you can hit around 15psi before it starts acting up. Besdies that it seems to idle fine, and drive good. Its only when you get into the higher boost. It finally threw some codes yesterday (P0301, P0302) so it at least narrows it to 2 cylinders now. Ive been told coil packs but dont want to just randomly throw money at it since I have yet to find a set locally that i can try/buy from someone. I also have a set of new injectors I was going to put in but that was going to wait for the VF39 swap to go with the tune so cant really try them since they wouldnt run right for now anyways. Anybody have any suggestions what to try next? Last edited by Merlin82; 02-11-2013 at 07:50 PM. |
02-11-2013, 11:47 PM | #53 |
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You don't have to replace the coil packs, just swap them around and see if the problem follows. Ditto for injectors.
Clean the crank position sensor and the MAF and the grounds. Compression test. |
03-14-2013, 12:05 PM | #54 |
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I had a P00018 code come up. Compression test was bad. May be going in for the new engine but could this code indicate something other than the worst news?
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03-14-2013, 04:33 PM | #55 |
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You should also add that the OEM EBCS can cause a miss fire.It causes boost issues and gives the P0301-304 cel
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03-14-2013, 06:38 PM | #56 |
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03-14-2013, 06:58 PM | #57 |
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IDK if the OP is still around and updating this thread, but a great addition would be splitting it into troubleshooting trees for Misfire with retained codes and Misfire without retained codes. (Just bucking and/or flashing CEL.)
I've been chasing a no code misfire for a bit now (waiting on new plugs) but haven't really found a good step by step in one thread, just a lot of scattered info. |
03-16-2013, 11:13 AM | #58 |
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Sweet this helped me out! How do u stickie??
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03-16-2013, 01:29 PM | #59 | |
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03-16-2013, 02:11 PM | #60 |
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No, haven't tried that. My problem seems inconsistent with what others report on cam and/or crank sensors. Just got plugs and a fuel filter in today, so going to replace those and see what happens. It's time for those anyway.
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03-16-2013, 05:34 PM | #61 |
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Cleaned the sensors and double checked the the spark plugs and coil packs then cleared the codes and no check engine light so far! Its running great now! Thank you all!
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03-17-2013, 08:11 AM | #62 | |
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03-18-2013, 06:42 PM | #63 |
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Great thread, thanks!
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03-27-2013, 07:46 PM | #64 |
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good thread, but I'm wondering if a bad front O2 sensor will also cause a misfire? I'm chasing down one and have read that a bad sensor will. Here's a link to my thread
http://forums.nasioc.com/forums/show....php?t=2484597 |
03-28-2013, 06:58 AM | #65 |
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A bad front one can,not the rear. Generally you will have an O2 DTC along with the misfire DTC's.
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05-01-2013, 05:11 PM | #66 |
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I just wanted to add one more fairly quick thing to check for the guys who have looked at everything on this list and still have a misfire. I recently found the source of my cylinder 1 misfire (P0301) after getting through most of the things on the list. We found that the ignition trigger wire to cylinder 1 seemed to be shorted to ground so then it was just a matter of finding out where. The short ended up being in the bundle of wires coming out of the ECU in the passenger footwell. Suddenly it all made sense because the misfire originally started when I was giving a co-worker a ride. He wanted to see how fast it was so I was driving "aggressively". I think he must have been pushing an imaginary brake pedal during the ride and may have bent the ECU cover and squished the wires into the edge of the bracketry under there. My car is not stock but I have never removed my ECU and the wire bundle was still tied down with the factory zip-ties so it seems like this could happen on any car (stock or not).
I guess this could be expanded to a more general: "Check ignition and injector trigger signal wires." Hope ths helps or at least gives you an idea of something else to look at. Thanks, Mickey Oswald |
05-07-2013, 09:37 AM | #67 |
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Thanks directing that thread here, following what I posted there
'I've been going threw a similar issue, but no sputter. Some research will help, every case is a little different. I'm doing things as I can, I've checked everything that can be done without costly replacement (cleaned maf, iacv, plugs, crank&cam, replaced fuel filter). I have 160k miles, my next fix is motor mounts then fuel pump followed by injectors.' There is only one issue I have with the initial post here; the only people who will send their injectors out is someone who has to (ie different then stock or relatively new). And also the fact that you've not included motor mounts. Usually for me, I can pull any gear and while costing I get the blinking death engine light. So checked everything and logic has brought me to motor mounts, along with some other research elsewhere. |
05-07-2013, 10:47 AM | #68 | |
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Motor mounts would be a "knock" issue not a misfire issue. Not sure how motor mounts cause a misfire issue but if you have empirical info to provide please add. |
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05-07-2013, 11:28 AM | #69 | |
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Yes mounts are more of a knock issue but again mileage and time makes it reasonable to do for Pmcs. Can't find info I read to back it. |
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05-07-2013, 01:20 PM | #70 | |
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Then go post this info in the "If you have a knock issue please read this!" thread. Jesus Christ..........maybe you would like to post some more info on things that don't pertain to this thread? How about wheel bearings? They don't cause misfires but hey mileage and time makes it reasonable to do for pcms........ |
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05-07-2013, 01:51 PM | #71 | |
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Quote:
http://www.iwsti.com/forums/2-5-lite...tor-mount.html |
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05-07-2013, 03:46 PM | #72 |
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I had a cel come on this morning while driving normal on the express way and its a solid cel. I have never seen a "blinking" cel
What would be the difference between a solid cel and blinking cel? Taking the car tonight to AutoZone to get the code read. |
05-07-2013, 03:53 PM | #73 |
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Well to me. When I have 1 cylinder misfiring the cel stays on solid. But if it's 2 (or more, I never experienced more then 2), it will be blinking. That's what I think.. Whether its spark plugs or coils
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05-07-2013, 05:11 PM | #74 |
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Blinking CEL is a substantial misfire.
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05-07-2013, 05:13 PM | #75 | |
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