Now hot idle problem

[Matt Beaubien]

It started doing it again on the way home from work.  The only way I could
get it to idle was to give a good bit of throttle.  It wants to die when
shifting gears, and will die if left in neutral long enough.  Drivability is
actually ok, and it pulls just great at 1.4/1.5 bar.

I grabbed some dinner after work, and then went to work on the car some
more.  Of course I can't replicate the problem.  I let it idle for 15
minutes and nothing happened.  I heat soaked it for a bit and let it idle
some more.  Nothing happened.  I drove it around for 5 minutes and nothing
happened again.  Ugh.  I tried disconnecting the throttle switch and it
didn't do what it was doing before.

My thought is that it is something electrical.  It wasn't as warm after work
as it was during the day, and I didn't have this problem a week ago when it
was cooler.  It reminds me of my flaky fuel pump relay that would make the
car run crappy at the _exact_ same point on the drive home.  Flaky
electrical devices seem to be affected by a time at temperature situation.
Sounds much like what I'm experiencing now.

So, what's electrical and affects the idle air and/or fuel.  I can pretty
much guarantee it's running lean when this happens, though it could be
ignition.

Place your bets now!

TIA,

Matt Beaubien
'86 5kt
'73 911E

----- Original Message -----
From: "Matt Beaubien" <mrbeau0 at yahoo.com>
To: <quattro at audifans.com>
Sent: Tuesday, June 26, 2001 1:02 PM
Subject: Now hot idle problem


> I still have my cold-start problem (unrelated, it's
> been around for months), but yesterday I suddenly
> developed a hot-idle problem.  I was coasting to a
> stop in neutral when I noticed the brake pedal was a
> bit stiff.  I glanced down at the dash and noticed
> that the dash lights were on and the tach was at zero.
>  I cranked a bit and it fired back up.  This happened
> a few more times.  I poked around the engine bay and
> didn't see anything really amiss.
>
> I unplugged the O2 feedback to see if that would have
> any effect.  It seems to be about the same.  No
> obvious air intake leaks, though I don't no if they
> would cause a problem when hot.  The ambient is a bit
> hotter than it has been (~80F), but it was this warm
> ealier and didn't have any problems.
>
> New parts: fuel pump, MM hose, plugs, wires etc.
>
> It sure seems like it's running lean when it starts to
> miss.  I'll try monitoring the O2 signal when it's
> running but not missing.
>
> Any idea on why it's fine when cold?  Cold would be
> <~85C on the coolant temp.  Once it's warm enough for
> the fan to kick on is when I seem to have problems.
>
> Thanks (again) in advance,
>
> Matt Beaubien
> '86 5kt
> '73 911E
>
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