RPM increases in idle without touching pedal

2001 CADILLAC DEVILLE
101,000 MILES • V8 • 2WD • AUTOMATIC
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JAMES NELSON
  • MEMBER
  • 1 POST

also on the highway it will run over 65 MPH with
touching the pedal.
Feb 6, 2011 at 3:44 PM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
Is there a check engine light on? It could be result of faulty TPS, or possibly a vacuum leak. A not so obvious area for a vacuum leak is the plenum boot between the intake and throttle housing, this usually splits on the lower portion, and intake pressure changes can change the characteristic of the leak.
Feb 10, 2011 at 4:18 AM
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