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Continual stalling while at idle (repost) 200 1979

uid 15053's pic
posted by  Dylan Berichon on  Tue Oct 9 17:57 CST 2007
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last visit: Thu Oct 23 17:22 CST 2014
[RELATED]

(This is mostly a repost, seems my last thread has fallen through the cracks.)

Regarding my '79 242. M-46, 417K miles.

The car has decided to start stalling. It's as though there isn't enough fuel getting into the mixture. So I'll adjust the idle screw and all is dandy! ...at least for a few minutes. Then the same thing happens.

Now the screw is at the maximum of it's adjustment, which I know is not right, and it still stalls.

I disconnected a vacuum line and the car started idling more like it should, so it seems there's a blockage somewhere, but I can't figure out where. I also tried unplugging the O2 sensor to see if it was bad, but there was no change.

One mystery to me is that AC Idle compensator deal, pictured here:



(picture from my '80, but the same part).

I unplugged one of the vacuum lines going into that thing and now the car at least stays running... it's running rough though. I don't think this could cause the problem, but you never know. AC is switched completely off.

So now to keep the car idling, I have one of the above pictured vacuum hoses disconnected. I also still have to have the idle screw cranked to full other wise it will stall. It is idling fast, but at normal idle (about 900K) it will stall.

Maybe not related, but the car has been running a LOT rougher when cold. In fact, the past couple of days when I've started the car cold I get a backfire. Not good. Replaced the fuel filter, no changes.

Anyway, I'm totally stumped. Any ideas are welcome.

Thanks as always.
--
Formerly 'HearToTemptYou'






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