High Revs After Drive
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Cadillac Seville / Cadillac Eldorado Forum Discussion, High Revs After Drive in Past Cadillac Vehicle Discussion; I'm kind of stumped. My RPMs are going up to 1100-1200 after a drive when I shift in to park. ...
  1. #1
    Yaemish is offline Cadillac Owners Connoisseur
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    High Revs After Drive

    I'm kind of stumped. My RPMs are going up to 1100-1200 after a drive when I shift in to park. If I turn the car off and back on, drive around the block, go back in to park it won't happen. Only on legit drives when the car has be going for a few minutes.

    Today a new symptom started. I was going 40-50 and the RPMs just kind of stayed high and I didn't feel the car shift where it normally does. I did the IAC back in December to fix a stalling problem so I know that is good. This new thing today kind of reminds me of what it felt like when the CAT was going bad (but got a new one of those last summer).

    I've got two codes, the old P0410 for secondary air (pump is new and I hear it run from time to time, I think electrical connector may be bad and have a new one to install). Or that pump code could be coming from one of those valves being bad. I'll start with the connector. The newer code is P0442, maybe that is tied to one of those valves being bad? Would the P0442 cause the RPM issue?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: High Revs After Drive

    When was the TB last cleaned?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it.
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    Re: High Revs After Drive

    P 0442 = EVAP system (air) small leak. MAYBE during the drive - but EVAP does not bleed fuel vapor and air air to the throttlebody at less than XX steady mph or before XX minutes at XX steady mph.

    https://obdii.pro/en/model/gm

    As posted, TB cleaning, search for vacuum leaks.

    Your 2002 EVAP and vacuum diagrams .............. click to enlarge, follow the prompts at the lower edge of the picture.
    Attached Images

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    Yaemish is offline Cadillac Owners Connoisseur
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    Re: High Revs After Drive

    Thanks for the replies guys. The TB is probably pretty clean. I do that stuff pretty regularly. Tonight when I was investigating a new sound from coming out of the driveway (rear stabilizer bar decided to snap), the RPMs were doing the low bounce thing. Its almost as if the new Delphi IAC is already going bad.

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