Question about 1992 Cadillac DeVille

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My 92 cadillac deville is loosing power after i drive it for so long. I press the gas and it doesnt rev up or speed up unless im barely pressing the gas pedal what is the problem??

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Check the air filter for a blockage. If you have a scanner, check to see that the TPS (throttle position sensor) is going all the way from 0% to 100% opening as you press the accelerator down all the way, while the ignition is on and the engine is not running.
Check for codes that might lead to a solution, if the above doesn't help.

Posted on Jul 03, 2010

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Weres the fuse for the gas opener in 99 deville


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My truck wont start unless i prime the carborator first, then it wont stay running unless i rev it high just before i put it in gear, or im accellerating...


To start with, you have a throttle body instead of a carburetor.
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I have a '92 deville, and am getting concerned...


Check fuel pressure regulator. pull vaccuum line off and see if gas comes out. If so, that is likely part of the problem.

Also- if more than 75000 miles on injectors- replace them, you may have some leaky injectors. This is their expected service life.

IF in the odd chance you had one of the last carburated caddies, replace the choke thermostat and make sure idle step lever drops out of the way when warm.

Otherwise for fuel injected engine replace in this order throttle position sensor, air temp and coolant temp sensors and clean Mass Airflow sensor by back flushing with electrical contact cleaner. These all contribute to the engine computer thinking the engine is cold and it is compensating by increasing engine speed. My assumption is these are all original to the car.

Jan 24, 2012 | 1992 Cadillac DeVille

1 Answer

Just want to know if the 1999 deville cadillac is fronmt or real wheel drive


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Dec 15, 2011 | 1999 Cadillac DeVille

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1992 cadillac deville looses power over 55 mph.


Have your Cat Converter checked, ASAP.

Apr 25, 2010 | 1992 Cadillac DeVille

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Started car and the diplsy showed 0 mph when driving, felt a hesation when pressing on gas pedle


check the vehicle speed sensor, that would explain the hesitation also cause the ecm is not reading car movement

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Press gas and let off and is still gains speed


check to see if you have a idle speed control

Nov 28, 2009 | 1994 Cadillac DeVille

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92 cadillac deville 4.9L starting problems


There should be a wire that runs from the ignition to the solenoid, check that the wire has power when you turn the ignition key, if it has power the solenoid may need replacing.
Check to see if you have power getting to the distributor and the spark plugs, if you have spark it is possibly in the fuel system

May 19, 2009 | 1992 Cadillac DeVille

1 Answer

My 92 cadillac sedan deville is idling very high and when i let off the brake it will increase in speed w/o pressing the gas pedal. any ideas?


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.

Feb 20, 2009 | 1992 Cadillac DeVille

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