P0108/rough idle error code after fishtailing and spinning on the highway

[Adam Peacock]

This morning I had a a P0108 error code (Manifold Absolute Pressure/
Barometric Pressure Circuit High Input) come on after I lost control
of my 2000 Legacy GT 5speed on the highway - fishtailed about 4 times
and then did a complete 360 before coming to a stop (deer jumped about
a quarter second in front of me at 65 mph). Now the car has a really
rough, low RPM idle but is fine at speed. Does anyone know what the
cause of this could be?

-Adam Peacock
(e-mail address removed)

 

[Jim Stewart]

This morning I had a a P0108 error code (Manifold Absolute Pressure/
Barometric Pressure Circuit High Input) come on after I lost control
of my 2000 Legacy GT 5speed on the highway - fishtailed about 4 times
and then did a complete 360 before coming to a stop (deer jumped about
a quarter second in front of me at 65 mph). Now the car has a really
rough, low RPM idle but is fine at speed. Does anyone know what the
cause of this could be?

You scared the hell out of it.

 

[AS]

Look for a vacuum line that may have come off. Intake, throttle body
would be a good starting point.

 

[Carl 1 Lucky Texan]

Look for a vacuum line that may have come off. Intake, throttle body
would be a good starting point.

Good suggestion. I would also just clear the code and see if it returns.
I suspect it will, the rough idle seems to point to a real issue, but
sometimes clearing the ECU will work miracles.

Carl

 

[JD]

Good suggestion. I would also just clear the code and see if it returns. I
suspect it will, the rough idle seems to point to a real issue, but
sometimes clearing the ECU will work miracles.

Carl

It might. Subaru ECUs are adaptive. If it sees a code, it assumes
something is wrong and tries to compensate for it. I have cleared misfire
codes (from my wife leaving the gas cap off) and the car smooths out.

 

[AS]

Just wondering what caused your wife to misfire and what kind of gas cap
she has... i might one day need one for mine...

 

[JD]

Wives misfire constantly. Since only their creator can understand them and
they seem to communicate by telepathy or something, I doubt anyone will ever
figure out why they misfire. And when they do, the response is certainly a
code of some kind; and they don't need any kind of cap to do it...

 

[suburboturbo]

Wives misfire constantly. Since only their creator can understand them and
they seem to communicate by telepathy or something, I doubt anyone will ever
figure out why they misfire. And when they do, the response is certainly a
code of some kind; and they don't need any kind of cap to do it...







- Show quoted text -

JD

Sure wish I knew how to clear those codes. Mine misfires all the
time.
My Subaru runs fine though.

 

[Weaponer]

JD

Sure wish I knew how to clear those codes. Mine misfires all the
time.
My Subaru runs fine though.- Hide quoted text -

- Show quoted text -

A lot of times you can clear the codes by disconnecting the negative
battery cable for a couple of minutes. Of course, it will also clear
your settings on the radio.

 

[Todd H.]

JD

Sure wish I knew how to clear those codes. Mine misfires all the
time.
My Subaru runs fine though.

$70 at your local walmart and you'll have a code scanner that'll clear
and read them. I bought the nicer one at $100 and it's come in a lot
more handy than I'd ever think.

Or you can take the car to auto zone when they're not busy. They'll
scan and read the codes... but i dunno if they'll erase em though.

 

[JD]

JD

Sure wish I knew how to clear those codes. Mine misfires all the
time.
My Subaru runs fine though.

Chocolate and roses. My Scoobie runs fine too.

 

[clare at snyder.on.ca]

A lot of times you can clear the codes by disconnecting the negative
battery cable for a couple of minutes. Of course, it will also clear
your settings on the radio.

Won't clear a 2000 Sub. Codes are in NVRAM.