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Old 09-06-2005, 08:22 PM   #1
Annoying Eric
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Member#: 94074
Join Date: Aug 2005
Default Idle problem after blowing SBF5

1998 Subaru Impreza L Wagon:


Background:

I was experiencing some stalling/sputtering/sluggishness when it rains, so I figured the spark plug wires were arching. I replaced the spark plugs and wires and the car ran better then ever before.

Two days later in the morning I started the car and it immediately stalled. I tried again and it started, still running strong. I stopped at a gas station to pick up some coffee, left the car running. Come back and leave the gas station, the car is still running strong. 5 minutes later I’m going about 30mph and the engine stalls, check engine light turns off; I pull it to the side of the road.

It turns out the SPF-5 fuse popped: causing no fuel/spark/start, it will crank. I unbolt the main fuse box to find out what wire is causing the fuse to pop. It is the black and red wire going to the: main relay, fuel pump relay, ecm, and data link connector (OBD2). It blows whenever the key is on the “on position”.

I unplug the ecm and turn to “on position”: fuse does not pop.
I swap the ecm with another I bought a salvage parts yard: still pops when plugged in.
I unplug the fuel pump: still pops.
I unplug both O2 sensors: fuse does not pop.
I plug back in the fuel pump: the car starts and runs, but the idle is funny: hanging around 1300/1400 rpm.
I plug back in the O2 sensors: the car starts and runs, but the idle is funny: hanging around 1300/1400 rpm.

New Problem:

Now everything is the way it was when I was blowing fuses except now it doesn’t blow and there is a weird idle.

Idle video: www.raynorsyr.com/sub-rpm.wmv

^it jumps up and down between 1300 and 1400 rpm, when cold or warm.

So there had to be a short somewhere right? Maybe at the fuel pump, it was pretty dusty and I cleaned the connector as much as I could. I must have gone through 12 fuses until I bought a 30a circuit breaker and popped that many times. I really don’t know, but the car is running great except for the idle problem, some sluggishness but not bad.

I have a check engine light….7 codes total that were erased except 2:

P0135 – Front Oxygen Sensor Heater Circuit Malfunction
P0141 – Rear Oxygen Sensor Heater Circuit Malfunction
P0183 – Fuel Temperature Sensor A Circuit High Input
P0443 – Evap System Purge Control Valve Circuit
P1102 – Pressure Sources Solenoid Valve Circuit Malfunction
*P0505 – idle control system malfunction
*P0505 – idle control system malfunction

*not able to erase.


I hope I was descriptive enough, it's going to the dealer soon if I can't figure this out. Thank you for all your help.

AIM: s0dium22
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Old 09-06-2005, 08:26 PM   #2
Annoying Eric
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s0dium22 doest work for some reason...try:f1ip0ut
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Old 09-06-2005, 08:38 PM   #3
Annoying Eric
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i am never posting a screen name again....I'm getting locked out of aim
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Old 09-07-2005, 08:28 AM   #4
Ramon_12345
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Join Date: Oct 2004
Location: BARBADOS
Vehicle:
1999 JDM GC1 IMPREZA
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I am glad to see that you apparently got the short-circuit problem rectified.

I would suggest that you make a simple check to ensure that all of your vacuum hoses are connected since this can cause an erratic idle and it could be possible that a hose could have come loose while you were working in the engine bay with the fuse/breaker.
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