My 1990 chevy k1500 stalls when i turn my headlights or heater fan on .. I have replaced my tps sensor.. Coolant temp sensor and map sensor. But the problem remains and only does it when i run either

Chris Turk

Asked by Dec 10, 2015 at 07:17 PM about the 1990 Chevrolet C/K 1500 Extended Cab LB 4WD

Question type: General

1 Answer


Check for vacuum leak. Spray carb cleaner around vacuum lines and listen for idle change. If it does u have a leak. U can also safely plug main vacuum line at booster(BUT DON'T DRIVE LIKE THIS), and see if it doesn't stall. If it doesn't then it indicates leak. These motors are very vacuum sensitive and I had similar issue. Also sea foam through main line is great for cleaning and can helphelp. It has instructions on back ofbottle.

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