Have you checked the valve that is operated by the idle control unit?
Is the fuel pressure correct?
Checked very carefully for vacuum leaks?

Larry A.

On Jan 15, 2008 8:29 AM, Edward Duntz <eduntz@hotmail.com> wrote:

> I got a few responses for advice when I posted a few weeks ago but am
> still having problems. Any further thoughts are appreciated. Here's the
> short version of what's going on.
>
> This is a 1987 Wolfsburg with about 140,000 miles. Stock 2.1 engine,
> recent head gasket, front and rear main seals, clutch, and ring job.
>
> After the van sat for over a year waiting for a water pump and a front
> heater fan, it came back from the mechanic with a high and variable idle at
> atart-up, especially in below-freezing temperatures, and when I first take
> off, the van stumbles and hesitates for about ten seconds, then runs fine,
> but still a high idle until it reaches normal operating temperature.
>
> Here's what's been done- replaced temp II sensor, checked and adjusted
> throttle body and switch, tried two other AFMs, tried one other idle control
> unit by the tail light. Nothing seems to make a difference. I suppose the
> other AFMs and idle control units could have been bad, but they were
> supposed to be in good condition.
>
> If anyone has any other ideas, I'd sure appreciate them.
>
> Thanks,
> Ed Duntz in CT
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