1991 Cadillac DeVille Logo

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keith rash Posted on Jul 01, 2012
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How to fix code e98 1991 deville

Obd1 code e98 what needs to be replaced car shakes at idle

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Stephen

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  • Cadillac Master 21,873 Answers
  • Posted on Jul 01, 2012
 Stephen
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Probably two different issues.

The code is saying the computer sees the engine RPM is too high when shifting between park neutral and drive.
The rough idle would be something else.

3 Related Answers

Anonymous

  • 5 Answers
  • Posted on Mar 12, 2012

SOURCE: my cadillac deville has a code PO85 on it what does it mean

You just need to clean the throttle body. Take the air duct off and hold the throttle blades wide open (engine off). Spray the throttle bores beneath the blades with carb cleaner and scrub with an old tooth brush. clean the back side of the throttle plate also. The junk and gunk is plugging up the air flow past the blade at closed throttle and the idle speed control is running out of authority to open the blade. It just needs a thorough cleaning. Disconnect the negative battery terminal for 30 seconds when you are done to reset the idle learn offsets.

While you are in there and have the blades of the throttle body wide open....see those two tubes sticking up at you from the floor of the manifold?? Those are the EGR delivery tubes and they are NOT supposed to be full of carbon.... Rod them out with a piece of stiff coat hanger wire and carb spray to get them cleaned out.

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Anonymous

  • 19 Answers
  • Posted on Jun 30, 2009

SOURCE: 2001 Cadillac DeVille shakes while idling

the tune-up or the motor mounts

Anonymous

  • 85 Answers
  • Posted on Jan 28, 2010

SOURCE: Idle on my 1992 cadillac deville is very low

no take that ****** out and give it a bath in carb cleaner 20 mins coat with wd 40 reinstall if its better by a new one any way only a temporary fix dont////dont turn any screws

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