96 850 GLT Dies at stops, RPM drops only at night

kyle208 · Post by **kyle208** » 17 Apr 2014, 23:29

Issue has occurred for the past 3 months or so. When driving at night, the rpm drops from about 1500/2000 - 1000/1500. Also, sometimes when I come to a stop the car will die completely, and it may take 2 or three attempts to start again. Because it doesn't happen in the day time I think the cold air may be a factor.

Recently I cleaned the mass airflow sensor and the throttle body with appropriate cleaners, this seems to have had no effect. A mechanic I met suggested it may be the idle air control valve, but I want to be sure of that before spending over $200 for a new one. I have only had the car for 4 months, but previous owners took great care of it.

Any suggestions would be helpful, thanks.

kyle208 · Post by **kyle208** » 17 Apr 2014, 23:31

There are no other symptoms I've noticed and no OBD II codes.

Post by **Ben850** » 18 Apr 2014, 01:20

The things to check the IAC valve for would be broken / cracked hoses. Possibly the valve itself being dirty or sticky.
Clean valve with carb./ throttle body cleaner. Replace cracked IAC hose/s. I had seen one in the junkyard that was likely there for a cracked IAC hose. What a shame for them. I found useful parts.

Neither fix, or both should add to more than about $40.

Also, do a visual of all vacuum lines you are aware of. If you are not aware of yours, they may be indicated on a tag located on the underside of your hood. You can search this site as well.

Good luck.