1991 Cadillac Brougham Car Stalls When I Com eto a stop.

JGROFF05

MEMBER
1991 CADILLAC BROUGHAM
V8
2WD
AUTOMATIC
181,800 MILES

I am unable to figure out what is wrong with my car. When I am driving and come to a stop light or sign sometimes it will stall out on the final downshift or it will stall out while I am sitting there. I have replaced the fuel filter, checked the vacuum lines and replaced the egr valve and cannot figure it out. I was thinking maybe an IAC valve or perhaps the vacuum line from my air intake to my brake booster. Also my check engine light is on. I am not sure what it is. Please Help and give me a good place to start or a good suggestion.

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Clean out the IACV don't work disconnect the torque converter clutch solenoid and see what happens then report asap.

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Thursday, March 19th, 2009 AT 4:23 AM

FACTORYJACK

MECHANIC
4,159 POSTS

I believe you have an idle speed control motor, not a valve. This unit has a nose switch incorporated into it that senses when the throttle is closed, so the ecm can start controlling idle. If it senses the throttle in a closed stated when it is not, it will retract fully. It thinks the speed is too high for a closed throttle, and results in a stall when the throttle physically closes. At the throttle cam, where the cable connects, you will see this motor. If you lift the throttle by hand, and press on the isc plunger, you will see it retract. If it stalls and you look and see the plunger retracted, this could most likely be the fault.