Defective modulator valve.
That transmission is all computer controlled. No vacuum lines on it.
Vehicles with an automatic transmission may have lines that carry transmission fluid from the transmission to a separate tank on the bottom of the radiator.
on some cars there is a automatic transmission modulator valve that tell by vacuum when to shift gears. If that valve goes bad you will get tranny fluid in your lines.
There are no vacuum lines running to the automatic transmission.
on the top of the transmission its on the transfer case with 3 vacuum lines coming out of it.
Must be transmission fluid leak somewhere, and it's getting fluid on the exhaust. I'd be looking at the lines to the cooler first.
No, Not on that year. That trans. is computer controled.
I need a lay out of all the vacuum lines for a 1991 Chevy van.
how do you hook up vacuum lines in a 1988 Chevy nova
The vacuum lines are on the roof.
ontop of the tranny
It depends on which distributor and transmission you have. The stock distributor has one vacuum line going to it. An autostick transmission has one line. If you have a manual transmission and a Bosch 009 distributor like most people do, you have no vacuum lines.