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1989 Chevy Blazer w/ surge

Tiny
YUREWICZ
  • MEMBER
  • 1989 CHEVROLET BLAZER
  • 100 MILES
Have a 1989 chevy blazer with 350 engine that surges. Any ideas? Need to get this thing on the road
Monday, July 11th, 2011 AT 2:31 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Surges at idle or at cruising speeds? What have you checked or done so far?
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Monday, July 11th, 2011 AT 3:14 PM
Tiny
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Surges at idle. Tuned up, changed throttle body gasket and changed egr
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Monday, July 11th, 2011 AT 3:41 PM
Tiny
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First elimate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Monday, July 11th, 2011 AT 4:01 PM
Tiny
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I had already done that. Sorry forgot to list on work done.
Any other suggestions?
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Monday, July 11th, 2011 AT 5:53 PM
Tiny
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Sorry forgot to mention I already tried that. Any other ideas?
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Monday, July 11th, 2011 AT 6:08 PM
Tiny
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Check the EGR base plate under the TBI for exhaust leakage
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Monday, July 11th, 2011 AT 7:01 PM

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