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96 Yukon 5.7 Won't Start In Moist Air

menujet

By menujet
in Ask A GM Technician

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menujet New Member

menujet

Posted
Posted

My 96 yukon runs great after it starts. It starts all the time except when the air is moist out, e.g. after sitting overnight in rainy or snowy weather. Then, it will cough like it's getting spark but behaves like it's firing out of time.

 

I am wondering if my crankshaft or camshaft positioning sensors are malfunctioning in the moist air. I found the crank sensor and removed, cleaned and reseated the connector. The cam sensor, I have not been able to locate. I need to sell the car and since it has low value (200K miles) I am hesitant to replace a lot of parts on an experimental basis.

 

The check engine lite does not come on, so I am presuming no codes are getting stored.

 

Any suggestions would be greatly appreciated!

minibike132 Senior Enthusiast

minibike132

Posted
Posted

+2 and check the distributor body screens for blockage. Thats usually the main problem the cap and rotor moisture is where the blockage manifests till you notice it.

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