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Old 06-20-2010, 12:22 PM   #1
wr-ecks
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Default Help diagnose problem please.

We picked up a 90 Legacy L 2.2l last night for a super good deal but only because it has an issue the PO couldn't solve.

The car shuts off randomly, it could take 30 min or it could shut off every few seconds. It doesnt buck or throw any codes or give any warning at all. It very much feels like an electrical problem as opposed to a fuel problem. Every single time it fires right back up with no hesitation or waiting.

Its been to a couple shops but all it sounded like was done was some minor stuff like looking for loose grounds and making sure no wires were chewed through. The PO didn't want to pay a shop to guess at it and throw parts at it so he sold it to us. Any ideas?

Im thinking maybe the ECU???
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Old 06-20-2010, 01:03 PM   #2
Frogsthatmoo
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The shutting off thing sounds exactly what happened to me when my MAF went out. I don't know if the 90's car uses a MAF, but if it does happen to, that could be something to look at.


And when I say it sounds exactly what happened to me, i mean, identical.
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Old 06-22-2010, 11:23 AM   #3
Murphy's Law
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is it down on power and/or is it hard to start? does the engine just stop or a misfire and die?
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Old 06-22-2010, 12:00 PM   #4
Tessai
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Quote:
Originally Posted by Murphy's Law View Post
is it down on power and/or is it hard to start? does the engine just stop or a misfire and die?
Quote:
Originally Posted by wr-ecks View Post
The car shuts off randomly, it could take 30 min or it could shut off every few seconds. It doesnt buck or throw any codes or give any warning at all. It very much feels like an electrical problem as opposed to a fuel problem. Every single time it fires right back up with no hesitation or waiting.
.


As for the issue, I know OP said that they had checked for loose grounds... how about extra grounds? I had another car like this where someone had ghetto-rigged a negative battery terminal cable in an attempt to relocate the battery, but a botched stereo install could do the same thing. See if you've got any extra wires tapped in to the battery terminal cable that is grounding where it shouldn't be.

In my case I had a wire that had enough slack to swing side to side. It ran under the car and would ground out against the trans and killed the car.

Just a thought.
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Old 06-24-2010, 11:29 PM   #5
wr-ecks
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Sorry about the long pause inbetween posts. finally upgraded to Windows 7, Vista sucks bad. Anyways...

Update: Works been nuts so I havent had much time to work on it but I swapped the ECU, I found one at the local pull a part for 10 bucks so I grabbed it. Somebody broke the MAF so have to wait on that, ECU didn't solve the problem so next on my list is the MAF. autoparts store wants 220 bucks for one so I think I'll wait until I can get one for cheap for the wrecking yard so I at least know my 220 bucks is going to fix it.

I'll look around for weird wiring stuff but I don't think that would be it. The PO just used it for a commuter and never isntalled any kind of aftermarket anything as far as I know. Still has the stock deck and all. It used to run fine and then suddenly stopped one day.


It never starts rough, always starts right up no problem at all. Dies almost instantly. It bogs for a second then dies.
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Old 06-28-2010, 11:53 AM   #6
Jessekrs123
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Most likely it is the MAF, but also check that your crank and cam sensors are functioning properly. My crank sensor burnt out and needed replacement because my car would bog. Definitely check the MAF first, and most likely that will be the problem. If it still is not the problem, crank and cam sensors for the 1st gen legacys are very expensive because they come with the wire and all. You cannot just disconnect them at the sensor like with the 2nd gen models.
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Old 07-02-2010, 10:45 PM   #7
wr-ecks
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Hello again. It was the MAF. it run like a champ for a few days now. Thanks for your help, im sure it would have taken me a few more guesses before I got to the MAF so If I happen to run into any of you I owe you a beer. Thanks again!!
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Old 07-02-2010, 11:24 PM   #8
Jessekrs123
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^^^ Glad to hear your car is good to go now.
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