Check engine light and stalling

C

casper

We have a very elusive problem. I hope one of you has had the same and
can give me some clues. The CEL light comes on, and the engine misfires
until restarted. The code is P1507, which says Idle Air failsafe. We
have replaced the idle air motor, the throttle sensor, the computer
(twice), and triple checked all wiring and connections. We spent $ at
two dealers who said they had fixed it by replacing sensors, but it
repeated within half an hour. My local mechanic friend is tearing his
hair out. Does this ound familiar to any of you? (not the mechanic
tearing his hair out; I know that's familiar).
 
casper said:
We have a very elusive problem. I hope one of you has had the same and
can give me some clues. The CEL light comes on, and the engine misfires
until restarted. The code is P1507, which says Idle Air failsafe. We
have replaced the idle air motor, the throttle sensor, the computer
(twice), and triple checked all wiring and connections. We spent $ at
two dealers who said they had fixed it by replacing sensors, but it
repeated within half an hour. My local mechanic friend is tearing his
hair out. Does this ound familiar to any of you? (not the mechanic
tearing his hair out; I know that's familiar).
Does the misfire happen only at idle, or also when driving? The code makes
it sound like it should only occur at idle.

Mike
 
I had a Honda that had a very intermittent idling problem at startup...
turned out the idle air control valve was all gunked up... the local
mechanic cleaned the valve up and the problem never returned.
 
xblazinlv said:
Good luck dealing with Subaru dealers, they never can seem to
"duplicate the problem"


I would take it elsewhere and see if they can figure out the problem
for you.

Mine can. Slightest thing wrong with it, they do the diagnostics and do an
excellent job. I suppose it's easy to snipe when only one side of the story
is written about--and anonymously.
 
I have just encountered the identical problem on my 98 Subaru Forester. It
is driving my mechanic and me crazy. Did you ever find the source of the
problem and what did you do to repair it? Any help would be greatly
appreciated.
 
Casper, and any one else with this problem, my mechanic found the gas cap
seal was no good. He replaced the cap and the car now runs perfectly. We
tried all the same things you did with sensors and the computer. Got the
same cel code 1507 about Idle Air and throwing the car into Fail Safe mode
when slowing down and then downshifting into 3rd gear. The dealers will
attempt to sell you everything. Gas cap-$29.95
 
Still looking. Someone suggested a gas cap - we tried that first, and I
just did again - no luck. If you get anywhere, please let me know, as
will I for you. Thanks.
 
I wish it were that simple. We tried that first, and I just tried
again, just in case. Our mecahnic says it's nothing to do with the evap
system.
 
In message <(e-mail address removed)> - "casper"
:>
:>I wish it were that simple. We tried that first, and I just tried
:>again, just in case. Our mecahnic says it's nothing to do with the evap
:>system.
:>

I'm just tuning in to this thread... On my '94 Legacy the CEL has recently
started coming on (it goes off within a minute) and the engine has started
surging. Oh yeah, when these things are happening there's a "clicking" sound
(like a relay) coming from behind the dash (left side, I think).

Replacing the gas cap had no affect.

Rob
 
I'm just tuning in to this thread... On my '94 Legacy the CEL has recently
started coming on (it goes off within a minute) and the engine has started
surging. Oh yeah, when these things are happening there's a "clicking" sound
(like a relay) coming from behind the dash (left side, I think).

Replacing the gas cap had no affect.

Rob

Follow the information in this link to retrieve the trouble code(s)
that have been stored, this should point you to the cause of the
problem. -
http://www.troublecodes.net/Subaru/
Also note that on a 94, which is OBDI, the gas cap is not an issue.
OBDI systems do not monitor the integrity of the fuel tank and
evaporative system as OBDII systems do. You could drive around all day
with your gas cap off and not set any codes.
 
In message <(e-mail address removed)> - (e-mail address removed)
writes:
:>
:>
:>>I'm just tuning in to this thread... On my '94 Legacy the CEL has recently
:>>started coming on (it goes off within a minute) and the engine has started
:>>surging. Oh yeah, when these things are happening there's a "clicking" sound
:>>(like a relay) coming from behind the dash (left side, I think).
:>>
:>>Replacing the gas cap had no affect.
:>>
:>>Rob
:>>
:>
:>Follow the information in this link to retrieve the trouble code(s)
:>that have been stored, this should point you to the cause of the
:>problem. -
:>http://www.troublecodes.net/Subaru/
:>Also note that on a 94, which is OBDI, the gas cap is not an issue.
:>OBDI systems do not monitor the integrity of the fuel tank and
:>evaporative system as OBDII systems do. You could drive around all day
:>with your gas cap off and not set any codes.

Thanks for the info!! I'll try to dig into the codes this weekend.

Rob
 

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