'88 Vette manifold vac. issue.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
'88 Vette manifold vac. issue.
In park manifold vac is well into the green, and increases with throttle.
Pull into drive and vac drop out of green and goes lower with throttle.
On short test drive engine sputtered with throttle application.
I've checked all flex lines and all seem ok and no "hissing".
Any suggestions on where to look are much appreciated.
Pull into drive and vac drop out of green and goes lower with throttle.
On short test drive engine sputtered with throttle application.
I've checked all flex lines and all seem ok and no "hissing".
Any suggestions on where to look are much appreciated.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Thanks for the info on the 700R4, I couldn't find that info in my FSM. Still puzzling that manifold vac drops only when in gear??
I haven't touched the intake manifold with mods, save for the TB coolant bypass.
I have used the throttle set screw to increase idle, I'll back off that screw and use the std idle adjustment procedure.
I haven't touched the intake manifold with mods, save for the TB coolant bypass.
I have used the throttle set screw to increase idle, I'll back off that screw and use the std idle adjustment procedure.
