At the time I bypassed the valve atop the valve cover I used a hand pump tester on the modulator and it had a bad o-ring under a plastic cap which the vacuum tube attached to. When I replaced the o-ring my slipping/late shift was unchanged. After bypassing the valve I had a nice shift.

I put a new vacuum pump kit in about 2 years ago and at the time I saw no difference in any of the symptoms that prompted me to install it. All works well except the engine will not stop if it has been just started, it must run for 2 to 3 minutes before it has sufficent vacuum to stop. The power locks will function for about 2 or 3 minutes aftrer the car is shut off.

Should I find ALL vacuum leaks and repair them?

Should I replace the modulator?

What should the vacuum be at the main truck line at idle?

Thanks,

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tadco


82 300TD Wagon

previous diesels
82 OLDS 5.7
84 Ford with 6.9 LT
80 300D