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Post by storyworm on Nov 3, 2013 18:00:02 GMT -6
I want to first start off by saying, yes i know i can take my car to Ecotech or Sean at vigilant motorsports to fix this problem. I want to work on my own car because i dont have the funds or another car to drop my car off for a week at a time somewhere.
I've already had a few people trying to help me out with this problem but i figured the more minds we put together, the faster i can figure this out.
To get everyone up to speed. It's a 2002 wrx with an ej257. originally built by RAW performance, recently rebuilt by Ecotech (phase 2 maching) My car hesitates really bad under load. and it's recently been pulling this code. So what i've done so far is switch my injector, coil, and spark plug to try to get the code to follow a bad part. It didn't. Kevin up at ecotech did a compression and leakdown test, both tests ended up with good results (motor is good). No vacuum leak, Kevin and I did a smoke test on it. I not 100% sure of this but I dont think it's the tune. When my motor got put in, we put a safe tune on the car and it didn't have this problem. I've beening trying to fix the maf scaling with the help of eddie, graham, and ryan so i've had new tunes since then. When this problem started occur i switched back the map to the original tune to see if it would fix the problem. no luck.
So as far as I know the next step would be electrical?
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Post by besthaticouldo on Nov 4, 2013 13:55:25 GMT -6
Go back to the safe tune, start there.
If the safe tune is fine again, then you ruled out anything mechanical or electrical related. If the tune doesn't change anything then you've got a problem you need to diagnose. You may just have a something overlooked in your tune.
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Post by besthaticouldo on Nov 4, 2013 13:56:49 GMT -6
Also, for what it's worth. Misfire is 99% of the time caused by one of 3 things. Bad plug, bad coil, bad connection.
If you can rule all that out, start checking injectors, see if you have adequate fuel pressure at every cylinder.
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Post by banis325 on Nov 4, 2013 14:02:06 GMT -6
I've had kinda the same issue ish, that I just can't figure out. My long term fuel trim gets kinda high 26%ish and then when cruising at 2500-3000 rpms ill get a blinking cel for usually only cylinder 4 but sometimes 3 too, it doesn't seem to affect performance when it happens though.
I've replaced MAF sensor, ignition coil, plug wires, knock sensor, front o2 sensor, can't find any vacuum or exhaust leaks.
So I'm kinda in the same boat as you.
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Post by memmek2k on Nov 4, 2013 14:15:44 GMT -6
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Post by cmartise on Nov 4, 2013 15:47:40 GMT -6
Injectors?
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Post by storyworm on Nov 4, 2013 17:22:50 GMT -6
we've ruled out injectors, coils, and spark plugs (as stated in the first post). Also changed all exhaust gaskets. I have gone back to previous tunes to see if that gets rid of it with no luck. Going to try something tonight and i'll let you know how it goes
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Post by memmek2k on Nov 4, 2013 18:44:17 GMT -6
Did you move the wire with the coil/plugs? Longshot, but maybe the coil isn't getting the signal to fire all the time? Usually those don't go bad on newer systems I thought, though.
Did you try swapping fuel rails? If it didn't follow the injectors, it could still be fuel related between the pump and the injectors, I would think.
Otherwise, maybe a bad ground? I think I asked this at Perryville, but you've got the stock flywheel and stock crank pulley, right?
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Post by besthaticouldo on Nov 5, 2013 8:01:15 GMT -6
Bad ground could definitely do it. Voltages at battery good and everything?
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