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1997 Chevy Cheyenne Vehicle looses power under load

Tiny
PAPABEAR99
  • MEMBER
  • 1997 CHEVROLET CHEYENNE
  • V8
  • 4WD
  • AUTOMATIC
  • 248,000 MILES
My 1997 Chevy P/U looses power under load, like when I'm accelerating or climbing a hill. The problem first started when I replaced the vacuum idle motor. I've replaced the fuel and air filters. When it looses power the max speed I can get is 15mph. Putting it into neutral, the max rpm is 3000. When the vehicle is working right, the rpms will go to at least 5000. Help.

Bob
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Thursday, September 9th, 2010 AT 9:05 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check the catalytic converter for a broken bed material. If you have a vacuum gauge, attach it to manifold vacuum, raise the idle to 2000 rpm, if the needle starts to drop, the exhaust is plugged, pieces of broken converter can lodge downstream in the pipes and mufflers, and intermittently move, allowing exhaust to flow. As it shakes loose, it allows the exhaust to flow enough to drive it.
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Friday, September 10th, 2010 AT 3:12 PM

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