5.0f303 Posted August 13, 2005 Share Posted August 13, 2005 Hey guys, Well, i just acquired a 96 subie outback for free! She needed a motor swap so in went a low mileage 2.5 DOHC motor. The car ran great for 5 days and didnt miss a beat. One day i was driving her and out of no where, she cuts out. I tried to start it but nothing. Towed it home. Checked for fuel pump prime but didnt hear anything. Turns out the 30amp fuse in the main fuse box was blown. Changed it. nothing. So i tried a new fuel pump. Nothing. The next day, i tried to turn her over and pop...i blew the fuse again. I replaced the fuse, replaced the new fuel pump with the old, and tried it. Nothing...but it did prime the pump, just wouldnt comtinue to pump. I let the car sit, unplugged all the engine harnesses and cleaned them with contact cleaner and vrooom! she started. WTH? I drove her around for 2 days with no issue. Then one morning i came out , started her up...the idle went high for a second then it cut out again and wouldnt restart. I blew the fuse again. Now at this point, whenever i put a new fuse in, it blows. I let the car sit for 3 days and came out and tried it again. Now, the fuse didnt pop, but i wasnt getting fuel prime or spark either! This is driving me nuts cause its not consistant to track with things changing day to day. I ve traced the pump wires and they all look good. Changed the pump relay several times...no change. changed 5 different pumps..nothing. Ignition switch too...nothing. Is the ECU a common issue with these cars? It just seems that these components arent getting proper signal to energize at the right time. I ve also changed the crank and cam sensors too..... Ignition relay? But if this didnt work, the car wouldnt even turn over... Help guys, this is my first post here as a true subie member...hope theres some ideas! thanks in advance! Link to comment Share on other sites More sharing options...
Cougar Posted August 13, 2005 Share Posted August 13, 2005 You don't state what fuse you are replacing. It would help to know what the number of the fuse is so we could see what is being fed by that fuse. Part of the problem seems to an intermittent connection since things worked ok after you cleaned the wiring connections. Link to comment Share on other sites More sharing options...
5.0f303 Posted August 13, 2005 Author Share Posted August 13, 2005 hey, Sorry, it was the fuel pump fuse in the main box under the hood. ITs the green 30 amp. There are 2 i believe for the pump, which are side by side with each other. Only the one blew. Link to comment Share on other sites More sharing options...
Cougar Posted August 13, 2005 Share Posted August 13, 2005 If you don't have anything to test for voltage with then you need to purchase a test light probe at least or a voltmeter. You need to see where voltage is getting to when this problem happens and not guess at it. I have some wiring info for a '97 model and will check that when I get home in about a week. I don't know if the fuse is powering something else but it seems that it may be considering the current rating. Since you replaced all the suspect items it would seem something else is causing the problem. It is strange that it either doesn't work at all or blows the fuse intermittently. Link to comment Share on other sites More sharing options...
Cougar Posted August 20, 2005 Share Posted August 20, 2005 Checking my manual, it shows that fuse going to MB-3 which feeds the ECU, fuel pump relay, OBD-2 service connector, and the main relay. The main relay feeds voltage to the oxygen sensors, pressure sources switching solenoid valve, and purge control solenoid valve. I would suspect the problem is near the oxygen sensors first. Link to comment Share on other sites More sharing options...
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