Question about 1993 Cadillac DeVille

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When pressing the gas the car stalls and backfires

When i press the gas the 1993 cadillac sedan deville stalls and backfires then when i turn the car off and start it again it will not start any diagnostics

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Posted on Jun 26, 2009

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There are to many things that can cause the problem you have. Best thing we can do is get the DTC codes to understand better why your car is doing what it's doing.
The On Board Diagnostic (OBD) was designed on vehicles equipped with electronic fuel injection so you can generally retrieve the codes yourself. No need buying a scanner or running to any parts stores to check the engine light. This system is called obd1 and applies to most vehicles made before 1995 for domestics.

For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.

Counting the codes being flashed is almost quickest way to understand the Vehical's Engine Management and performance and most of the codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. 
Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Finally after performing repairs on the culprit code, always go for a road test to confirm if the problem is fixed.

Good luck and here is a link with the OBD codes, let me know if you need more help. http://chevythunder.com/199295_lt1_trouble_codes.htm#Code 28

Posted on May 10, 2009

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Posted on Jan 02, 2017

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What causes the throttle body to chatter when key is activated?


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Where is the fuel filter on a 1993 cadillac sedan deville i need to change it


Since we are limited in the amount of space we can use, I will have to give you a link to the step by step instructions.

http://www.ehow.com/how_6190439_change-filter-1993-cadillac-deville.html

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My car doesn't miss when I press on the gas right away but when I slow down then press the gas it misses and backfires.It idles perfect?


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1991 cadillac sedan deville has excess pressure in gas tank and stalls making right hand turns as soon as fuel gauge shows 9 gals.


SOUND LIKE FUEL PUMP GOING BAD.BUT CHECK THE EVAP CHARCOAL CANISTER FILTER IF GAS SOAKED REPLACE IT REPLACE GAS CAP MAKE SURE GAS CAP IS THE PRESSURE VACUUM TYPE.ALSO CHECK VACUUM PURGE VALVE VACUUM HOSE TO CARBURETOR AND CHECK VACUUM HOSE TO CHARCOAL CANISTER FOR BLOCKAGE RESTRICTION OR BROKEN AND MISSING.

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My 93 cadi deville touring sedan seems to be overheating. there is water in the radiator and in the resevoir but smells like its overheating when i turn it off. it also feels liek its going to turn off...


Hello, mona_felipe and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
1993 Cadillac DeVille, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose an overheating
1993 Cadillac DeVille
Pay attention to the block test part of the instructions.

Get more tips and tricks from a professional about your vehicle from: twitter.com/acoates23234
Thanks for the vote, and good luck!

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Oct 18, 2010 | 1993 Cadillac DeVille

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My 1993 cadi deville keeps flooding. gas fills-up in carbator when I turn key on. What's this?


first, the 1993 cadillac deville should have a throttle body not a carburetor. And, I think it has ported fuel injection to each cylinder with a fuel injector for each cylinder if it's like my 1990 Cadillac Deville.

Jun 20, 2010 | 1993 Cadillac DeVille

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Acceleration problems


This firing order diagram would not post in the clarification request for some reason, use this diagram with the information in the clarification request.


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Jun 19, 2010 | 1997 Cadillac DeVille

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Have a 91 cadillac sedan deville left the inside


Security system is active, look in your owners manual to deactivate

Jun 14, 2010 | 1989 Cadillac Sedan DeVille

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89 Cadillac sedan deville when car is on the service engine light comes on and have to disconnect the battery to restart the computer


Disconnecting the battery will neither clear the code, nor stop the light from coming on. Press OFF and WARM together on the a/c panel to read codes. Once repair is made, codes can be cleared by pressing and holding the OFF and HI buttons

Mar 25, 2009 | 1989 Cadillac Sedan DeVille

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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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