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Old 04-10-2016, 01:10 PM   #1
SL1
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Member#: 431507
Join Date: Oct 2015
Location: Knoxville, TN
Vehicle:
2002 WRX
Blue

Angry 02 WRX Wagon loss of power to shutting down 75% acceleration

Hey guys, I recently rebuild my engine over the winter, thanks to the help of this forum. I have been racing RallyX with my 02 WRX Wagon, this was my second race yesterday. The engine is 100% stock, freshly rebuild with all OEM subaru parts. I have a downpipes and catless exhaust so far. A month or so ago I was driving home from school and my car started cutting out around 3500 rpm, when I backed off the gas it went away, then it did it again at similar rpm and stalled. I waited a few seconds, turned it back over and it started right up. A few minutes later while accelerating in 2nd gear it cut out and stalled again. I looked at my downstream o2 sensor since I just had a custom exhaust welded on it and noticed a nick in the wire. Upon further investigation, the inside wires were not cut, just the cover. I heatshrinked the cover back on, put a protector over it and fastened it to the body so it wouldn't rub. I thought this was the problem but clearly it was not. It ran fine for a few weeks, then on the way home from a RallyX a few weeks ago, it was cutting out bad at higher rpm when I was driving it normally. usually from 3-4k rpm. I managed to get it home and the next day it was fine. Just yesterday in the middle of my RallyX race, i was accelerating in first gear at 5k rpm, it lost all power quickly and stalled. I started it back up, kept going down the track, and it stalled again going towards the finish. I check all my fluids, the air filter and the battery terminals, everything was fine. I tried one more run and it died again at higher rpm. This time it took 3 cranks to restart it. Today I am going to get a fuel filter. Can someone please tell me what the hell is happening? I have no codes, no fluid leaks, and basically the whole top end is new.... Thanks!
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Old 04-10-2016, 05:10 PM   #2
quazimoto
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Chapter/Region: MAIC
Location: Da-boonies,Va
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Check the engine/manifold grounds and the main harness connectors.
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Old 04-11-2016, 11:36 AM   #3
moldyviolinist
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Join Date: Jan 2016
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Sounds like a fuel pump issue to me. Your rebuild (especially exhaust mods) might be placing more load on your pump (is it the stock one? is it old?). I've experienced similar issues with a fuel pump that was on the way out.
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Old 04-11-2016, 03:11 PM   #4
Samurai Jack
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Join Date: Jul 2002
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2002 Enemy of Aku

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I highly doubt that has anything to do with his exhaust mods, unless the exhaust is burning its way through the insulation

Could be a bad fuel pump, as you suggested.

I've experienced the same type of issues with a clogged fuel filter.
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Old 04-11-2016, 03:59 PM   #5
ot65
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WRB

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Did you have your car tuned when you put the downpipe on?
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Old 04-12-2016, 08:07 AM   #6
Samurai Jack
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This has nothing to do with adding a downpipe on the 2002 WRX. The 2002's were not as sensitive to such things. That started with the 2004's

... and what is happening would not result from a downpipe being added
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Old 04-13-2016, 06:58 PM   #7
SL1
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Blue

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The car does not have a tune, as Samurai Jack said, they didn't need a tune for the downpipe. I actually bought the car with the downpipe. I would not have put it on. I don't believe the exhaust is causing the issue but it its straight piped back with just a larger resonator to tone it down a bit. I just changed the fuel filter. The fuel inside was definitely not top quality so it was probably pretty old. I am about to go test it now. I doubt it is the answer but it was worth the $20. The next thing I believe would be the fuel pump. I will check the grounds on the harness tonight. That was a great idea. Any other ideas? I am hoping it ends with the fuel pump. It's screwing with my rallyX times!
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Old 04-14-2016, 12:26 AM   #8
budsy
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rally blue

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I will 3rd the fuel pump......... I put in a wahlbro 255 and it whined like crazy..straight out of the box..... after a few months I started getting bucking/hesitation...thought it was the tune...but after some logs and investigating we found pump was faulty.

went back to stock fuel pump ..problem fixed.
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