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Old 12-19-2007, 08:43 PM   #1
Danny Boy
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Default Starts, but can't stay running....

Car: 1999 2.5RS
Background: Just put it back on the road after ~4 months of sitting outside. I started it and drove it around every couple weeks though.
Problem: Car starts, and idles for a couple seconds, then immediately dies.
Weird stuff: NO CEL's, or any idiot lights. All gauges are normal.

What I'm thinking....
1. Bad gas? it has been sitting for a while
2. I took in water through my COBB CAI w/ fender liners removed and screwed something up. No hydrolock because it still starts.
3. ???????


Thanks for all input.
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Old 12-19-2007, 09:01 PM   #2
y0ungsubi3
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altenator?
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Old 12-19-2007, 10:27 PM   #3
Danny Boy
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could be, but would there be a CEL for that?
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Old 12-19-2007, 11:04 PM   #4
PhilSine
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Vacuum leak?
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Old 12-20-2007, 11:27 AM   #5
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Oops, forgot to log off..
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Old 12-20-2007, 11:33 AM   #6
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Okay...

(and IE manages to prove why I use Firefox on a daily basis)..

Basically, I second the whole vacuum leak thing. Does the 99 have a MAF or MAP?
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Old 12-20-2007, 01:05 PM   #7
Danny Boy
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Maf.


-
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Old 12-20-2007, 01:09 PM   #8
Danny Boy
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Which would be the most likely vacuum lines? Anybody know? I just looked around the engine bay and couldn't find any obvious ones disconnected.

I also took out the air filter (cobb CAI) and cleaned it. Man was that thing dirty. Once it dries, I'll put it back in. Maybe that was the problem.
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Old 12-20-2007, 04:32 PM   #9
PARANOID56
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fuel filter? if its been sitting for a wile, gas can gel and mess up a few things
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Old 12-20-2007, 06:27 PM   #10
Danny Boy
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bump.
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Old 12-20-2007, 06:46 PM   #11
formula91
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I was thinking it was the alternator, because the 2.5RS has a pathetic alternator. I dunno if it throws a CEL or anything like that though.

Nevertheless it could be that. *shrug*

Bad gas is definitely possible, but it doesn't happen that easily. Even 4 months outside shouldn't gunk it up enough to stop fuel flow. But it is a possibility.

To be honest it could be a lot of things..

I had a family of mice taking and storing dog food in the exhaust pipes of an old SUV that wasn't used for months. That was IN a garage. Think of the possibilities when it's sitting outside. (That is not a joke. It's 100% true. The mechanic flipped out when he saw dog food come tumbling out of the exhaust. lol)

Just using my example to prove my point.

That being said, check for any kind of blockage in the exhaust... lol

Or in any kind of the intake lines and manifolds. Who knows what might have gotten stuck in there.

:\
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Old 12-20-2007, 08:18 PM   #12
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Possible MAF is going? What I typed before (using Firefox now) was that before my MAF went, I had like a 1/4 tank of gas in the car and it acted like it was out of gas. I put more in gas and for some weird ass reason it started.. Anyways, the MAF problems snowballed from there. It didn't throw a code when it first started either. Goes along with a vacuum problem too.. If nothing else pans out, maybe try cleaning the MAF and seeing if it helps.

Actually, if it's the MAF, you should be able to disconnect it and see if it stays on, although I think by the time I could/had to do that I had a couple of CELs and horrible gas mileage.

Just a suggestion..
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Old 12-20-2007, 08:50 PM   #13
Danny Boy
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To answer a few questions/comments.

1. alternator - when I had the car running, a voltmeter read ~14V for the alternator.
2. MAF - I replaced my MAF a little over a year ago.
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Old 12-20-2007, 09:07 PM   #14
Subie Gal
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Quote:
Originally Posted by Danny Boy View Post
To answer a few questions/comments.

1. alternator - when I had the car running, a voltmeter read ~14V for the alternator.
2. MAF - I replaced my MAF a little over a year ago.
yeah but you just said you sucked in a bunch of water a while ago

if you filtered water through the intake
the MAF could have been compromised

I would not rule that out.....


now... you said you "screwed something up" when you took on this water

what EXACTLY happened?
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Old 12-21-2007, 01:15 AM   #15
Danny Boy
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Quote:
Originally Posted by Subie Gal View Post
yeah but you just said you sucked in a bunch of water a while ago

if you filtered water through the intake
the MAF could have been compromised

I would not rule that out.....


now... you said you "screwed something up" when you took on this water

what EXACTLY happened?
I didn't say that very clearly. What actually happened is that I started from a stop in a puddle (~.5" so very small) and then did WOT to merge with traffic. Then the car just stalled.

What I was saying is that there might be a SMALL possibility that I sucked a little water in through my CAI through the fender-liner-less fenders.

Today I took apart my intake and found moisture in the filter element, and a tiny bit of moisture (very small amount) on the screen before the MAF. It was 100% dry at the throttle body.

I now think this may be MAF related. However, the last time my MAF went out (about a year ago) a CEL also went on. Is it possible that the MAF is screwed up, but isn't triggering a CEL?
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Old 12-21-2007, 01:51 AM   #16
renyo
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Like I said my MAF didn't trigger a CEL for awhile when it was borked.

In a somewhat related story, (full stock intake was on including at that time the fender liner) while I was driving through water that was way too deep I think I did something to the engine cause it would surge and cut out at random times (and random throttle positions).. the next day it all dried out.. could've just been a fluke or maybe i got water in one of the sensors and had to wait for it to dry.. no codes though... Maybe with the CAI it had an easier time getting in, but I figure if anything were going to happen it would've happened around the time when you went through the puddle..

Another question though, did you replace your old MAF with a new or used one? When I replaced the first one it ran fine for about a year, then it quit so I had to get a third one. The third one has been going strong for the majority of the life of the scoob though...
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Old 12-21-2007, 02:30 AM   #17
Danny Boy
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Quote:
Originally Posted by renyo View Post
Like I said my MAF didn't trigger a CEL for awhile when it was borked.

In a somewhat related story, (full stock intake was on including at that time the fender liner) while I was driving through water that was way too deep I think I did something to the engine cause it would surge and cut out at random times (and random throttle positions).. the next day it all dried out.. could've just been a fluke or maybe i got water in one of the sensors and had to wait for it to dry.. no codes though... Maybe with the CAI it had an easier time getting in, but I figure if anything were going to happen it would've happened around the time when you went through the puddle..

Another question though, did you replace your old MAF with a new or used one? When I replaced the first one it ran fine for about a year, then it quit so I had to get a third one. The third one has been going strong for the majority of the life of the scoob though...
It was new OEM subaru.
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Old 12-21-2007, 04:55 AM   #18
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Quote:
Originally Posted by Danny Boy
It was new OEM subaru.
Ok so the new airflow sensor probably didn't just randomly die. Although from what I understand they're pretty fragile..

You said you can get it to idle for a few seconds before it dies.. Does it ever get stable enough for you to tell if it feels rough or does it die too fast? Have you ever revved it when it was alive for the couple of seconds?
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Old 12-21-2007, 09:00 AM   #19
Danny Boy
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Quote:
Originally Posted by renyo View Post
Ok so the new airflow sensor probably didn't just randomly die. Although from what I understand they're pretty fragile..

You said you can get it to idle for a few seconds before it dies.. Does it ever get stable enough for you to tell if it feels rough or does it die too fast? Have you ever revved it when it was alive for the couple of seconds?
Yes. But yesterday, it completely died on me. Now it doesn't start at all. Turns over, but doesn't start.
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Old 12-21-2007, 09:23 AM   #20
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I'd discard any thought of the alternator. I'm betting on fuel delivery.
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Old 12-21-2007, 09:59 AM   #21
Subie Gal
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Quote:
Originally Posted by LetItSnow View Post
I'd discard any thought of the alternator. I'm betting on fuel delivery.
or air-fuel mixture.

you can try cleaning the MAF

but I would recommend you either....

get the car into a subaru tech for proper diagnosis

or try to self diagnose...

starting with a new MAF, pull and check all plugs, and ecu reset
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Old 12-21-2007, 10:08 AM   #22
Danny Boy
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Quote:
Originally Posted by Subie Gal View Post
or air-fuel mixture.

you can try cleaning the MAF

but I would recommend you either....

get the car into a subaru tech for proper diagnosis

or try to self diagnose...

starting with a new MAF, pull and check all plugs, and ecu reset
I already reset the ecu to no avail. I felt like I had exhausted all my own knowledge, so yesterday I towed it to my subie dealership to see whats up. Hopefully they'll be able to get to it today.
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Old 12-26-2007, 11:43 AM   #23
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Turns out that the timing belt had skipped a couple teeth. They replaced the timing belt and tensioner and thankfully no valves were bent, so now it runs good as new.
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