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Old 03-17-2005, 11:52 PM   #1
jponcelo
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Member#: 83273
Join Date: Mar 2005
Outback Sport 1997 Outback Sport that stalls randomly

My father and I have a 1997 OBS (2200cc) that dies all of a sudden regardless of weather/temperature, road condition, engine temperature or time of day. Occasionally the CEL will come on, and sometimes the AT Oil temp lamp will come on. The ODBII device we've attached indicates an air flow low input (P0102). We've replaced the fuel pump and filter, and run some fuel injector cleaner through. Our current thinking is that it is a problem with the main relay or the fuel pump relay or even the ECM itself, but I have scoured the web looking for failures relating to those parts and havent found any.

Fuel economy is fine and everything runs great until out of the blue the car stalls and you have to restart. At this point we arent even sure if it's the fuel system or the electrical, so if any of you have any ideas I would be most greatful.

Thanks,
-Jon
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Old 03-18-2005, 07:18 PM   #2
Kevin Thomas
Street Racing Instructor
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Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

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Quote:
Originally Posted by jponcelo
At this point we arent even sure if it's the fuel system or the electrical, so if any of you have any ideas I would be most greatful.

Thanks,
-Jon

Jon,

What was changed, looked at or tinkered with prior to the problem starting? Don't think about what could of affected the problem. Just ask yourself if ANYTHING was different from what you normally did before the problem started. Did someone look at the engine? Was a vacuum hose pushed/pulled? Was it at a dealership or other shop for oil change? Did you let someone else drive it before getting it back and noticing this problem? Was a new battery installed? I mean ANYTHING....
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Old 03-18-2005, 08:09 PM   #3
jponcelo
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Well about November of last year the check engine light came on, and I think that's the only thing that changed, but it was a couple weeks later that the actual problems developed. I just got off the phone with a mechanic who said that it could actually be the air mass flow sensor circuit itself, as the default action the ECM takes upon receiving bad signals is to cut the throttle back, effectively killing the engine. But that doesnt explain the AT Oil Temp light, though I suppose the two could be unrelated.

Thanks,
-Jon

BTW, 176K miles on it
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Old 03-19-2005, 11:26 AM   #4
Kevin Thomas
Street Racing Instructor
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Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

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You did state that the code thrown was airflow low input. Here's what I suggest.

Make sure all your vacuum hoses are on secure. Also, make sure your airflow sensor is has a snug fit.

Purchase an electrical parts spray cleaner. Spray the airflow cleaner really good. This is all that may be needed.

If it still dies, then purchase another airflow meter from car-part.com. You can get one as cheap as $25 or so. And there are a ton of places you can purchase it from. I usually get my parts from the online junkyards in about 2 days or so. If this don't work, we can go from there.
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Old 03-19-2005, 06:16 PM   #5
Sober_One
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Member#: 83322
Join Date: Mar 2005
Location: Ottawa, Ontario, Canada
Vehicle:
2000 Impreza 2.5RS
Sylverthorn

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I would check your connectors and vacuum hoses, as mentioned, and then look for any wires that may be damaged. If you have to, take off the wire shields to get a good look at the wires.

It won't take too long to inspect all the wires and you don't even have to do them all at once. You can do a bunch at one time and another bunch at an other time. Just mark the wires or bundles with a tag of electrical tape to reminde you which ones you've already checked.

Simple damage to wire insulation can cause worlds of problems and the problems can act like ghosts, there one minute gone the next.

Because the AT Oil temp lamp and air flow low input (P0102) are not related in any way that I can think of... it sounds more like an electrical short or grounding problem to me.
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Old 03-19-2005, 07:43 PM   #6
STi Guy 69er
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Member#: 82648
Join Date: Mar 2005
Chapter/Region: W. Canada
Location: Medicine Hat
Vehicle:
2005 Impreza 2.5 RS
Black

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I agree. Check ur vacuum hoses and then any loose looking wires. If someones touched them there is a chance that they are damaged and could be grounding out and touching something they shouldn't. For AT oil light.. get it checked out.
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