1998 Cadillac El Dorado self acceleration

1998 CADILLAC ELDORADO
204,000 MILES • V8 • FWD • AUTOMATIC
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SDICATALDO
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  • 2 POSTS
while driving the car will accelerate on its own and when you stop and put it in park the engine revs up to 3000 rpms. does this occasionally and it's dangerous.
Jun 18, 2009 at 7:35 AM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
Is there a check engine light that goes along with this. Does it feel like the gas pedal sticks, or has some dead space. You could have a faulty IAC valve or dirty passage, a failing TPS sensor, deposits in the throttle bore, or faulty/sticking throttle or cruise cable. What causes the idle to come to normal, restarting?
Jun 18, 2009 at 10:39 PM
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SDICATALDO
  • MEMBER
  • 2 POSTS
it seems to go back to normal after turning it off for a bit
Jun 19, 2009 at 9:42 AM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
It really needs to have a scan tool hooked up to see what is telling it to idle high, or what is causing it to idle high. You didn't mention whether a check engine light was on.
Jun 20, 2009 at 1:48 AM
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