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Old 01-06-2010, 01:28 AM
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whunter whunter is offline
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,359

Originally Posted by MotorCityMadman View Post
We had a cold snap around here lately. It was down to -36c at night and about -25 during the day. It's now -15c. Now the fuel shutoff doesn't work and the brake boost works for a few applications and then is gone. The fuel shutoff problem in the cold happened last year in the cold as well but not the brake problem.

Is this indicative of moisture in the system? Or is this a vacuum problem, ie. a poor pump or leak? What are your experiences those of you in cold environments?
Hello Ted

I would guess that the issue is in the engine vacuum pump.
The valves get stiff/hard with age, and extreme cold can cause them to not seal = vacuum loss.

Vacuum Pump Rebuild Thread

"Hen's tooth" 1985 300D vacuum filter dark black

Vacuum Pump Repair Kit, For Piston Type, Includes Seals and Valves
MB# 000 586 17 23

Cool name...

The MotorCityMadman
Ted Nugent

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Last edited by whunter; 01-06-2010 at 01:04 PM.
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