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High RPM's

Tiny
ERIC DILLON
  • MEMBER
  • 1995 CHEVROLET LUMINA
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
My son has the car listed above it has a 3.4(oddball) V-6. Sometimes the rpm's race way up, drops to normal, or below normal then stalls. What could cause this? I have sprayed cleaner on the mass air flow sensor. The thermostat has been changed. Today it raced up to 4000 rpm's. Any help would be greatly appreciated.
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Sunday, August 6th, 2017 AT 7:13 AM

1 Reply

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Maybe take the IAC off and clean it and the hole it came out of with a spray can of 'throttle body cleaner'. See my link:

https://shop.advanceautoparts.com/p/bwd-idle-air-control-valve-21812/3488764-P?searchTerm=iac

you can also clean the throttle body's butterfly on both sides.

Many times a vacuum leak (loose/cracked hose/or plastic related components) will cause the elevated rpm. You may hear it hissing. I would look for those first, before cleaning the parts.

The Medic

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Sunday, August 6th, 2017 AT 1:52 PM

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