944s stalling at idle occasionally

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william_b_noble - 05 May 2004 04:40 GMT

remote diagnostics is hard. My daughter has a 944s that she says stalls on
occasion when she comes to a stop, but otherwise runs fine, and always
starts back up OK. Normally it idles at 800 as it is supposed to, but
sometimes it just drops right to zero. Because it starts right back up, I
don't think it's the DME relay or DME, the only thing I can think of (until
I see the car) is the idle control valve (or idle bypass valve, or whatever
you call that thing underneath the intake manifold that bleeds air past the
throttle plate to adjust the idle).

anyone got any other suggestions as to what to look at? I'll see the car
Saturday

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Bill

also check out http://www.home.labridge.com/~wnoble

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ApogeeEng - 05 May 2004 20:43 GMT

Ask her if the A/C is on or off when she has the problem. If on, have her turn
it off and see if the problem persists.

The reason I suggest this is that the Auxilary Air Valve (the thing under the
intake manifold to which you refer) becomes more critical under the load of the
A/C

Larry
'86 944 NA
'87 944S.

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william_b_noble - 06 May 2004 05:47 GMT

I've asked awaiting reply - that's a good thought since the AC has a feed
into the DME that was intitally causing trouble (see prior rather long post
explaining what I ultimately found). My guess is that this isn't the
problem though - we shall see.

Any more ideas? I don't see how a crack in the rubber hoses or air plenum
could cause this in such an intermittant manner, but it's certainly another
possibility - the car's old and of course the rubber is getting hard. And
maybe it's a special "S" thing - they are the only ones with a hall effect
sensor on the distributor, for example. ????

> Ask her if the A/C is on or off when she has the problem. If on, have her turn
> it off and see if the problem persists.
[quoted text clipped - 6 lines]
> '86 944 NA
> '87 944S.

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