SURGES

  • Tiny
  • cutlass4bbl
  • 1989 Oldsmobile 88
  • 103,000 miles

My car surges at start up Idling. And while warm. When I go e it some has it stop but sometimes does it while I keep steady pedal pressure on the freeway. Would this be an egr problem? It just had a tuneup.

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Tuesday, April 23rd, 2013 AT 7:11 AM

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  • Tiny
  • cutlass4bbl
  • Member

Meant to say when I give it some gas it stops.

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Tuesday, April 23rd, 2013 AT 7:16 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,265 posts

First eliminate 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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Tuesday, April 23rd, 2013 AT 7:32 AM
  • Tiny
  • cutlass4bbl
  • Member

Just cleaned the throttle body but notice at the egr it's leaking. Sprayed some water on it and sure enough it was bubbling by one corner of the gasket. The car has sat for a long time. Before I bought it and the egr body is pretty rusted. I can hear it hissing while the engine is idling and it runs tough but when I spray around the egr with carb cleaner it smooths out. And lol yes I know it's not smart to spray carb cleaner around hot parts. Could I just take the egr off, replace the gasket and clean the egr valve and fix the problem or should I get a new egr?

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Tuesday, April 23rd, 2013 AT 10:13 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,265 posts

There is no problem with using carb cleaner to find vacuum leaks. We do it all the time. I can't tell you what it's going to take to fix your particular vacuum leak. It depends if it's leaking through the gasket or the valve itself.

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Tuesday, April 23rd, 2013 AT 11:31 AM

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