| Re: Rare 89' Coupe Deville - Problems
I think without even playing around your idle problem would be resolved by replacing the ISC motor and the TPS. Had the same types of things on my 89 STS with the 4.5
It's also possible that the gasket under the throttle body is leaking. I had to replace mine as well but I'm willing to bet it's one or both of those sensors.
The good thing is these cars are extremely easy to work on. You could probably do all the work yourself in an hour or two with some basic hand tools.
Coolant loss is another issue.
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Ownership:
89 STS (1 of 1893) - FOR SALE
02 Blue Onyx DTS
01 DTS:
Custom installed Volant CAI
Custom PCM
Body color engine components
Cruiser Alloy wheels
EBC brakes
Eibach springs
Corsa exhaust
Sportwing Spoiler
Semi-custom interior
Custom quad Hi-Beams
Future Plans: More interior work.
Memberships:
National and regional Cadillac & LaSalle Club
Proud Volunteer - Northstar Tuning Project
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