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D_Ryan 03-05-2007 08:24 PM

IP shutoff affected by temp

Any idea what could be causing my Cali-spec 1985 300TD to not want to shut off when the ambient temperature is 40 or below? At temperatures above that, shutoff occurs immediately as the key is turned, but if it is cold outside, the car will run on for 30 seconds or more, with the revs slowing and finally stopping.

Haven't had a chance to put a Mity-Vac on it yet, likely that will be this weekend's project, but I can't imagine what in the system could be affected by temperature...

Thanks in advance


Craig 03-05-2007 08:28 PM

Probably a vacuum leak at one of the rubber vacuum line connectors. Cold temperatures will tend to make the rubber hard and more leaky if it is marginal. Start by looking at all the vacuum connectors under the hood.

bgkast 03-05-2007 08:29 PM

You have a vacuum leak somewhere. The rubber fittings get harder when it is cold causing a faster leak. Get your mighty vac out and get testing! :)

Shorebilly 03-06-2007 07:24 AM

Also of note.....
The Climate Control (Klima) is effected by if one of the diaphragms is could possibly cause a similar symptom......


barry123400 03-06-2007 10:00 AM

I would think the vacuum leak afecting the shutoff is just afecting your climate control as well when cold out. Wherever it is. If vacuum is disconected from the climate system when off it may be an indicator of where the leak may be. For all I know the climate system could be under constant vacuum though.
You could quick test that by seeing how the car shuts down cold perhaps with the climate control off. Temporarily plugging a line might give separation as well. Really though your mity vac should quickly give some indication of where the leak or leaks are at cold temperatures. You unfortunatly have to do these tests out in the cold.

kerry 03-06-2007 11:09 AM

Shorebilly has it. Try pushing the far right climate control button before shutting off in cold weather. If it shut off fine, you've got a vacuum leak in the climate control, probably a bad pod. Could be the footwell pod. If you have the system set on automatic, that footwell pod will activate when the heat turns on. could be others also.

mespe 03-06-2007 11:38 AM

We all know that diesels don't like the cold, below 40 your baby wan't to keep warm by continuing her idle,,, :silly:

As far as leaky rubber vacuum connectors, wouldn't a little vegetable oil soften up the rubber? It sure does on the rubber stoppers that prevent the fuel door from having metal on metal contact. softens those puppies right up.

bgkast 03-06-2007 02:05 PM

It could also gum up the vacuum system. Those rubber connectors are cheep.

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