Eratic Idle in Park 89 Volvo 760T

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wouter2 - 20 Oct 2004 20:41 GMT

Vehicle idles eractically in park from 900K to 15K back and forth all the
time. With Aux Air Valve house pinched idle ok.

What's the problem?

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Peter K L Milnes - 21 Oct 2004 01:36 GMT

I would suggest that the inlet tract (including Idle Air Control Valve ) is
in need of a thorough clean up. VOC recommend task is done every two years
to keep system on the ball.

Cheers, Peter.

> Vehicle idles eractically in park from 900K to 15K back and forth all the
> time. With Aux Air Valve house pinched idle ok.
>
> What's the problem?

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wouter2 - 22 Oct 2004 22:08 GMT

I replaced the tract and value with a new one. Same problem.

Any other suggestions

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Peter K L Milnes - 22 Oct 2004 23:55 GMT

Do you mean that you replaced all the inlet tract from filter to manifold?
The idea is just to clean it thoroughly. This includes the MAF, throttle
body, throttle stop microswitch and Idle Air Control Valve along with all
the hosing and electrical connectors. It is a good idea to ensure that the
PCV system is also clean and clear.

Cheers, Peter.

>I replaced the tract and value with a new one. Same problem.
>
> Any other suggestions

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