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04 wrx shutting down wont start
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pugsley
New User
Aug 26, 2010, 1:44 PM
Post #1 of 4
(2649 views)
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04 wrx shutting down wont start
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I have a 2004 Subaru impreza wrx. 2.5 short block wit forged pistons, 2.0 heads ported and polished +1mm oversized valves stage 2 cams 255lph fuel pump 850cc injector, td05 16g turbo intake and full exhaust.the motor only has 10k on but the body has 107k. The car will run for a few hrs then the guages all start going bonkers the check engine light will go off then on. I loose power when the light starts flashing. no new stored codes (2 stored o2 sensor heat codes but have been there for a long time) after that if i slow down the car will shut off and wont start. you can hear the fuel pump running and if you go under the hood you can hear the fuel running threw the fuel pressure reg. i tapped it (fpr) and it shutoff and started right up. so i replaced the fpr figured the prob was fixed but i was wrong and had to get towed home last night. if you leave it long enough the car will start up but if i drive it the prob wit start again. so i dont know where to start looking. I hope some can plz help me.
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Sidom
Veteran
/ Moderator
Aug 26, 2010, 7:35 PM
Post #2 of 4
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Re: 04 wrx shutting down wont start
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Well it sounds like you have a lot going on here with a lot of different modifications....... Even with the AM fuel pump it still has to be tied into the PCM circuit some how. With that being said, when the engine is off there is no way the fuel pump should remain running...period....
Why,, is a different story....Could be a driver issue or something staying grounded when it shouldn't. This really sounds like just an electrical problem, so the mechanical modifications shouldn't have anything to do with it...
I guess the best place to start would be to look at at the fuel problem. Find out why the pump is staying on when the car is off and that might tie in with your dash problem.....
Considering all the mods that were made I'm not even sure how they tied all this stuff in or if my diagrams would be accurate or not.....
The best source for this info would probably be the shop that built this car...........
(This post was edited by Sidom on Aug 26, 2010, 7:36 PM)
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pugsley
New User
Aug 27, 2010, 7:00 AM
Post #3 of 4
(2629 views)
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Re: 04 wrx shutting down wont start
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i should have been more clear sorry. wit the key on the fuel pump stays running NOT when the key is off. usualy when i turn the key on the fuel pump runs for 2 or 3 sec then shut off then the car starts up fine but when this prob starts the fp runs non stop wit the key on. so idk if it a short in the fp somewhere. i hope this clears things up.
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Sidom
Veteran
/ Moderator
Aug 27, 2010, 9:34 PM
Post #4 of 4
(2619 views)
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Re: 04 wrx shutting down wont start
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Yes I assumed that's what you meant, with the key on engine off (KOEO) and with the KOEO the pump shouldn't stay running on any car for more than a couple of seconds.
That is the 1st problem that needs to be traced down.....
This one is probably a little beyond me...... I'm a straight factory tech...... I don't really get into high pro & street mods.... While the mechanical mod really shouldn't have anything to do with it, there has been some electrical conversion as well and this is where the questions arise..... What connecter where cut/altered & where? How well where the harnesses sealed??? What effect does the different current flow have on the PCM & related circuits??? Probably nothing.....but that could be where the trouble lies......
I would talk to the shop that did the mods 1st..... If this problem is common to some of there AM parts they might know right off the bat without even having to pick up a meter..............
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