Quote:
Originally Posted by weldbead
moderator:
sorry i screwed it up.. i voted for greater than 30 seconds..in fact my pump runs(i stopped timing it after 60 seconds)
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> 30 sec would include 60+ I would think. In any case you have a significant leak that requires attention.
Using a Mitivac (hand vacuum pump) one can isolate the problem fairly simply.
Here's a schematic of a 90, but the other years are quite similar, except the MAP switch is located under the ECM on the 90, but is under the plenum on 91+ cars.
The place to start is with the rubber connector on the plastic vacuum line, located on the plastic line, just as the line goes under the plenum. Pull it apart and put your thumb over the end of the tube. If the vacuum pump shuts off, then the problem is under the plenum (sorry). Otherwise the pump itself or the tubing or check valve is suspect.
Once under the plenum, you can use a Mitivac to apply vacuum and proceed to "divide and conquer" until the leaking component(s) are isolated.
The plastic vacuum line I've seen packaged in rolls at AutoZone. It can be cut to length and shaped with a heat gun or possibly a hair drier. Rubber connectors can be had in generic form as well as vacuum solenoid switches.
Stopping here, because this is OT. But, begin another thread (if you haven't already) and we can help ya isolate the issue, if need be.
P.