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jazzmaster, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2951
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93 chevy pickup 350 engine surges at idle

Resolved Question:

93 chevy pickup 350 engine surges at idle
Submitted: 6 years ago.
Category: Chevy
Expert:  jazzmaster replied 6 years ago.
hi ,it is very possible that the egr valve is stuck open a little or that you have a vacuum leak,also does the injectors look as if they are both putting out the same amount of gas?,do check the egr first as this was a problem with these trucks ...guy
jazzmaster and 4 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
Hi,the injectors are working as they should and the egr valve seems to be working for i can watch it when i increase the throttle from under the hood
Customer: replied 6 years ago.
Hi Guy, Just went out and cranked the truck and was watching the egr valve when i was slowly accelerating the truk from under the hood i could see the egr valve opening and closing repeadedlycausing the surging and when i disconnected it ,the egr valve, it ran fine
Customer: replied 6 years ago.

what causes this to happen

Expert:  jazzmaster replied 6 years ago.
the egr is weak and or dirty try cleaning it out with carb cleaner if that doesnt work then you can either buy a block off plate at a parts store or make a solid gasket for it ...guy..

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