P 0506 again - low idle speed
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, P 0506 again - low idle speed in Past Cadillac Vehicle Discussion; 2003 Deville w/ 125K miles. Every couple of months it will not idle stalls out . Can't be TB cleaning ...
  1. #1
    bobstanster's Avatar
    bobstanster is offline Cadillac Owners Fanatic
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    P 0506 again - low idle speed

    2003 Deville w/ 125K miles. Every couple of months it will not idle stalls out . Can't be TB cleaning or it would be a full time problem , same with vacuum leak , the problem would be constant not intermittent .

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: P0506 again!!!!!

    P 0506 - http://myweb.accessus.net/~090/dtcobd2.html

    Thanks for the definition (I changed your thread title to better reflect the problem)

    "Idle speed low" can be several things, not simply the IAC. Vacuum leak problems normally cause fast idle, IAC passage problems cause low idle. TPS (Throttle Position Sensor) can cause idle faults. Excess engine loads (aftermarket batteries and alternators) can cause low idle problems. Air filter new within 12,000 miles ?

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    bobstanster's Avatar
    bobstanster is offline Cadillac Owners Fanatic
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    Thread Starter
    Problem was pretty bad then we had very unusually warm weather and the problem went away . What gives ?

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    Re: P 0506 again - low idle speed

    Eliminate the free stuff first and clean the TB.

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