Re: 5kcstq: Continued warm-up trouble

[Aleksander Mierzwa <alex@matrix.pl>]

At 13:32 15.09.98 -0700, Wallace White wrote:

>I'm still having trouble with the car when it's cold. In the morning,
>after an overnight low of ~50 (just a guess), it starts just fine. It
>runs just fine for about one minute, and then starts stumbling. It often
>dies at this point, unless I modulate the gas pedal just right, and then
>it is very difficult to get it to start again. Sometimes it then
>backfires. After running for 15 minutes or so (well after the temp gauge
>shows plenty of warmth), it has gotten over it and it runs fine.

Wallace,
I can think of three things to check.
First is the the warm-up regulator. This is the thing bolted to the left
side of he engine block with two fuel lines and an electric connector
attached. Unfortunately, to reliably check it's operation one needs a fuel
pressure gauge. You can, however, check if there's a voltage (12V) present
on the electric connection after starting the car.
Then there's the temp sender for idle controller. It is located on top of
the upper coolant flange. It's resistace should be about 1000ohms when cold
and about 100ohms when hot.
Finally there's identical sensor under the said cooland flange. It's for
ECU and the resistance values are identical as for the idle controller sender.

Aleksander Mierzwa
Warsaw, Poland
mailto:alex@matrix.com.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)