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Old 04-14-2012, 05:28 PM   #1
steveomiami
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Default 1992 wrx died, wont start

I just put the rob 550 tune in with yellow injectors walbro 255lph fuel pump. The car started and idled well. I took it out for a drive and it was running really good until it hits 9-10 psi of boost then it stutters and won't pull past that. Soooo smooth until 9-10 psi of boost then a little shaking and it seems like maybe the bov let off too but I'm not sure. I drove around for maybe 20-30 minutes off of boost and everything was good. Getting closer to my house I got on it again, it stuttered and died and now it won't restart, any ideas? Also I just noticed the O2 sensor wires melted together on the exhaust manifold. I know this happened durning this drive.
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Last edited by steveomiami; 04-14-2012 at 05:38 PM.
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Old 04-14-2012, 06:27 PM   #2
steveomiami
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Update.....spraying a little ether into the intake the car runs until ether is gone, What fuses and relays work the fuel pump or maybe the fuel filter is stopped up? What else should i check?
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Old 04-14-2012, 07:33 PM   #3
reddevil
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Fixed the O2 sensor and wiring yet?

Check all the fuses in the box under the hood, there is a chance you blew one when the wires melted.
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Old 04-14-2012, 08:27 PM   #4
Ioku
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It could be your fuel pump is bad, can you here is running if you cycle the key to the on position?
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Old 04-14-2012, 10:15 PM   #5
KLZCYA
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Its quite common for the fuel pump wiring to fry itself. Check under the seat for the fuel pump wiring.
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Old 04-15-2012, 01:41 AM   #6
steveomiami
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i didnt fix the o2 wiring but i seperated the wires and reset the ecu and still no start. I think the melted wires were just a coincidence. I have yet to find any bad fuses, which ones would it fry? I can't hear the fuel pump cycling.
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Old 04-15-2012, 03:18 AM   #7
BoMbS
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Like KLZCYA and Ioku said above, if you can't hear the fuel pump, then it's not working.

The two likely culprits are:

1. The fuel pump wiring and harness under the rear seat.

2. The fuel pump itself.

Good luck!
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Old 04-15-2012, 07:20 AM   #8
steveomiami
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I swapped out the fuel pump with another good one that I have and also tested out the walbro while it was out. Both fuel pumps are good. I looked at the wiring harness under the seat and i think its the one that you guys are talking about and it seems to be good as well. Next I pulled the fuel pump relay(the one on the green connector) I turned the car to on and probed all 4 wires for the relay and none of them had power. whats next?
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Old 04-15-2012, 11:30 AM   #9
steveomiami
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I think I found it, fuse SBF #2 is blown I can't believe all of these hours and I looked over that
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Old 04-15-2012, 12:14 PM   #10
BoMbS
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Awe man, that sucks. I've been there, I once replaced a bunch of wiper parts (motor, switches, relay) before I realized it was just a stupid fuse...

Glad you figured it out!
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Old 04-16-2012, 05:20 AM   #11
steveomiami
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Replacing the fuse didnt get her started, it put 12V to one of the wires to the Fuel Pressure Relay but still got no fuel, I put a jumper in place of the relay and she started right up. Does that mean its the relay for sure?
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Old 04-17-2012, 02:55 AM   #12
Ioku
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most likely, if everything is good before and after the relay then its bad, its common for them to wear out.
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Old 04-17-2012, 08:19 AM   #13
steveomiami
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Now the car will run but im still getting the hesitation problem, once it hits about 7 or 8 psi it hits a wall, what all can cause this?
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Old 04-17-2012, 07:19 PM   #14
TommyAtomic
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Quote:
Originally Posted by steveomiami View Post
Replacing the fuse didnt get her started, it put 12V to one of the wires to the Fuel Pressure Relay but still got no fuel, I put a jumper in place of the relay and she started right up. Does that mean its the relay for sure?
Really? With the relay it fails but if you bypass the relay it works. I'm a little shocked you haven't already replaced the relay.
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Old 04-17-2012, 07:23 PM   #15
TommyAtomic
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Quote:
Originally Posted by BoMbS View Post
Awe man, that sucks. I've been there, I once replaced a bunch of wiper parts (motor, switches, relay) before I realized it was just a stupid fuse...

Glad you figured it out!
I replaced most of my fuses with smart fuses for this reason.

Its so much easier then having to go through every bloody fuse to figure out which one is blown or if its even a bad fuse at all.

Too bad they don't make relays as well.
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Old 04-18-2012, 12:15 PM   #16
curtiscrandall
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Had a 93 turbo legacy that acted similar, ended up being fuel pump hose was bleeding off pressure. Just a thought.
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Old 04-18-2012, 03:01 PM   #17
steveomiami
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That would be nice but I'm guessing not I'll double check them again, I'm leaning towards spark blow out due to misgapped plugs or bad coils
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Old 05-21-2012, 01:42 PM   #18
luka
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Quote:
Originally Posted by steveomiami View Post
That would be nice but I'm guessing not I'll double check them again, I'm leaning towards spark blow out due to misgapped plugs or bad coils
had the same issue, it was bad gap on the plugs.
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