How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask jazzmaster Your Own Question
jazzmaster, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2951
Type Your Chevy Question Here...
jazzmaster is online now
A new question is answered every 9 seconds

93 chevy pickup 350 engine surges at idle

Resolved Question:

93 chevy pickup 350 engine surges at idle
Submitted: 7 years ago.
Category: Chevy
Expert:  jazzmaster replied 7 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 3 other Chevy Specialists are ready to help you
Customer: replied 7 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 7 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 7 years ago.

what causes this to happen

Expert:  jazzmaster replied 7 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..