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Matt
Matt, Engineer
Category: Subaru
Satisfied Customers: 20599
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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Subaru Forester: , a friend of mine has a 97 Subaru forester.

Customer Question

Hello, a friend of mine has a 97 Subaru forester. Not sure how many miles, but it will randomly shut off while driving, not while slowing down or stopping, while he is driving. We have replaced o2 sensors, fuel pump, fuel filter, and fuel pump relay. No changes. At this point I am starting to believe it is an electrical issue. It has a new battery and alternator in it as well. Would a bad ignition switch cause this kind of issue? It usually starts right up after it dies, but I am running out of ideas and he is running out of money. Any suggestions help
Submitted: 1 year ago.
Category: Subaru
Expert:  Matt replied 1 year ago.
HelloI'd agree that it does sounds like an intermittant electrical issue as these will come and go This could be a wiring issue as things tend to expand when hot and its possible a poor or partial electrical connection is being pushed apart on one of the major sensors so check the connection plug and wiring to the following;Airflow meterCrank position sensorCam position sensorO2 sensorThrottle position sensor unplug each in turn and use some switch / contact cleaner spray on the pins to ensure its all grease / dirt free Also worth checking the connections to the fuel pump for the same reason - unplug each in turn and give them a good squirt of switch / contact cleaner - Not WD40 and also unplug and inspect the main power relays and fuses for signs of overheating or corroded terminals - so the ones for the ECU and the fuel pump And also unplug the wiring loom connections in the engine bay one at time and inspect for corroded or recessed pins.
Expert:  Matt replied 1 year ago.
hi do you still need help?

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