Why does the engine stall occassionally when the air cond is on? No codes. Have replaced crank sensor, throttle position sensor and ecm since these parts may not give out codes when stalling. It stalls when in drive but will start back up immediately. Problem happens only when the air cond is on but cannot duplicate when the car is in the repair shop. No starting problems. Fuel pressure is fine.
Stalling on 1990 Buick LeSabre
by Visitor in Roselle, IL on March 16, 2010
ANSWER by patrick mannion on March 16, 2010
I hate replacing parts without testing them and confirming they are bad. Your engine has an idle speed control valve mounted on the throttle housing. When electrical loads are applied or the air conditioning is turned on the computer in your car receives a signal a "load" has been turned on and should compensate by raising the idle speed, perhaps there is a problem with this control valve or associated wiring. .
This car was idoling high, I fixed that problem in the beggining it was idoling high and stalling, when coming to a complete stop or slowing down. So now the idoling problem is fixed but every time...
The next day i can drive 2 blocks and it starts to stall it feels like lm running outof gas took it to shop they said problem was fixed next day same thing now they say i need mass air flow sensor ...
The mass air flow or crankshaft position sensor may fail causing the engine to stall intermittently. Proper diagnoses will be necessary to determine the cause of any stalling condition.
Have had the car stall when service engine light comes on, other wise it will keep running but will hesitate or act as if it is missing.(chugs). This is only at times then runs fin when it does sta...