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1995 Oldsmobile Aurora Hesitates at 45 mph

Tiny
AURORAPROB
  • MEMBER
  • 1995 OLDSMOBILE AURORA
  • V8
  • FWD
  • AUTOMATIC
  • 132,000 MILES
I just bought a 1995 Oldsmobile Aurora with 132,000 miles. When you start moving its fine but at 45 mph the rpm's drop from 2500 to 1500 and the engine hesitates and sputters and there's a clunking sound coming somewhere in the under the hood but if you give it gas the rpm's go up and it does fine with some sputtering. Also if you floor it, it hesitates through all gears. I can feel the Idle air control pushing against the gas pedal when I let off the gas. The I.A.C also clicks about 7 times when you turn the car to on but don't start it and when you shut the engine off. I've checked everything the injectors, fuel/air filter, hoses, catalytic converter, and even sprayed the throttle body with cleaner and cleaned the butterfly valve. WHAT'S WRONG WITH MY CAR!
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Monday, June 16th, 2008 AT 4:05 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Is your check engine light on? EGR could be sticking. IAC would be suspect if car had idle or coasting problem, but EGR MAP and TPS could be suspect.
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Monday, June 16th, 2008 AT 4:24 PM
Tiny
AURORAPROB
  • MEMBER
  • 2 POSTS
No the check engine like or service engine soon light is not on and the computer says all monitored systems are ok.
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Monday, June 16th, 2008 AT 10:07 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
The sensors we are talking about are involved in open and closed loop operation, and can be slightly out of range, and not picked up by the ECM.
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Tuesday, June 17th, 2008 AT 5:19 PM

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