Question about 2004 Cadillac Deville

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Why does my 2004 cadillac idle too high one day and too low the next?

My cadillac started out dying unless i held my foot on the gas when coming to a stop. now it idles too high one day and too low the next.

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Anonymous

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Posted on Jan 02, 2017

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Anonymous

  • 1 Answer

SOURCE: 1994 Cadillac Eldorado Northstar High idle

I am not sure if this will help you but PO27 is listed as "Open Throttle Signal Switch" which could mean that your throttle position sensor needs replacing. Although with Cadillacs, it could mean anything. I hope this helps...

Posted on Feb 03, 2009

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cadman000

Eric Heifetz

  • 607 Answers

SOURCE: my 92 cadillac sedan deville is idling very high

sounds like the ISC ( idle speed control ) motor is being told by the computer to extend or else its possibly binding. Located on the drivers side of the throttle body . Also check for binding aceelerator linkage. One other thing that might sound strange is check the floor mat by the gas pedal. Sometimes gets jammed.

Posted on Mar 29, 2009

Anonymous

  • 1392 Answers

SOURCE: Cadillac stalls when foot off gas

IAC motor, or dirty throttle body.

Posted on Jul 14, 2009

MNfisherman

Nate Stansfield

  • 11896 Answers

SOURCE: 2001 Cadillac Deville won't stay on after turning

EIther the IAC or throttle postion sensor is dirty or faulty. Or leaky vacuum hose somewhere. As long as it is not missing and running weird, then you may have bad coil packs.
You can go to autozone.com and register for free online repair manual for your vehicles if you need it.

Posted on Jan 06, 2010

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Rocky Degelman

  • 444 Answers

SOURCE: 2004 cadillac deville engine idle races and stalls

Is your check engine light on while your driving? If it is get a hold of a scran tool to find out what codes are showing.Or most auto parts supply stores have one end will check it for codes, Most of them don,t charge to check it out for you.

Posted on Oct 26, 2012

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3 Answers

When i come to a stop the car wants to die unless u keep ur foot on the gas


Hi Wendi:
If the engine runs fine except when you don't have your foot on the gas, maybe the idle stop needs to be adjusted. With the engine off, have someone step on the gas pedal while you look at the linkage at the carb. There should be a plate with a screw in it that keeps the butterfly valve from closing completely. This can be adjusted with the engine running. (SAFETY FIRST - MOVING PARTS CAN BITE)
If the engine will only run at not nice too high RPM, chances are that the idle jet in the carb is plugged, and a carb cleaning and possibly overhaul may be needed.

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4.9 clean throlle body / tps adjustment and or replace / minuim idle air adjustment and idle control motor adjustment and or replace
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Idles roughly, then low when stopped or in park, then dies. Decreasing gas mileage. Slow to accelerate


Sometimes that's caused by a vacuum leak near the manifold area.

Sometimes air in the coolant will cause an idle problem. Air will keep the air temp sensor from sending proper info.
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It starts but will not idle. if you take your foot off the gas it dies. sometimes it will run good and i take it around the block it will die when i come to a stop unless i put it in neutral and keep my...


Possible areas of concern are:
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A faulty gas cap can cause the sensor to come on.
Clean out the throttle body with a cleaner and see if the idle improves.

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