Fw: Odd engine problem on a rainy day . . chug, chug, chug, chug

[SJ]

Update:
Went to same store today, afternoon. Sunny dry day, temp was about 45-50.
One mile drive.
Started car after it sat for about 10 - 15 minutes.
Started ok, rough idle . .gas peddle had no effect. Cleared up in about 5 -
10 seconds. Some hesitation when coming off idle. After a few minutes it
cleared up . .no more problems.

I think the Ignition is eliminated as the cause of the problem.
I'm thinking one of the temperature sensors is telling the CPU that the
engine is fully warmed up when its not, and I'm getting a lean mixture.

How many temperature sensors are there? Is the MFT sensor the main one that
I should be looking at?

SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q


----- Original Message -----
From: "SJ" <syljay at optonline.net>
To: <quattro at audifans.com>
Sent: Thursday, December 25, 2003 12:32 PM
Subject: Odd engine problem on a rainy day . . chug, chug, chug, chug


> It was cold, foggy, and raining yesterday. Temperature was about 50 F.
> Oregon style weather.
>
> Drove the 90 100Q to the store . .about 2 miles away. Parked and shut off
> engine.
>
> Came out of store in about 20 minutes, started engine.
> Started up ok, but sounded like it was running on one cylinder. Pressing
> down on gas pedal did not change the RPM . . .chug, chug, chug, chug . . .
.
> sounded like a one cylinder diesel engine on the African Queen.
>
> I let it run this way for about 30 seconds or so . .figuring it was wet
and
> something in ignition was misfiring. Maybe it would dry out a bit.
>
> After about 30 seconds or so, the problem cleared up, no more chugging,
gas
> pedal worked.
> I drove home gingerly. There might have been a slight hesitation or
stumble
> going from idle to part throttle . . I'm not sure. I was very easy on the
> throttle because I didnt want to be towed home.
>
> Today, I sprayed the ignition wiring, coil, booster with WD 40. Weather is
> sunny, dry, 35 F.
> Car started up with no problem. No missing, no hesitation.
>
> The ignition wires and cap and rotor are about 1 year old. Maybe 4k miles
on
> them. Same for the plugs.
> ISV valve was cleaned about 500 miles ago . . nothing was wrong with it .
> .just preventive maintenance.
>
> Any ideas?