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Old 11-10-2007, 02:02 AM
nscarr nscarr is offline
Wrenched User
 
Join Date: Sep 2006
Location: Seattle
Posts: 97
Quote:
Originally Posted by alfa 75 View Post
Probably a dumb question but hell, I'm new to these cars-- what's the line going into the airbox?

got a picture of that line?


what i'd look at, in terms of vacuum:

check and see if the modulator is holding vacuum--a new o-ring is probably helpful--just pop off the modulator cap and replace, if needed.

i like to check the vacuum right at the transmission's modulator by putting a three-way connector with long vacuum line attached to gauge, then check while parked and look at the profile while revving--should drop at higher rpms--opinions on profiles vary but something like 10" vacuum at idle down to zero at full throttle with a more-or-less linear drop with respect to rpm. (you can also T into the line in the engine compartment, obviously; should be the black line.)

maybe that helps? at least for starters...
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1980 300D (non-turbo, 421k miles)
1984 300TD (turbo, 305k miles)
1985 Vanagon (170k miles)
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