Question about 1993 Cadillac DeVille

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My 1993 cadillac deville sputter when i excellerate then shut off also shut off when idleing new wires and plugs already install

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  • bishopkuy Oct 13, 2010

    DO NOT HAVE A MAF SENSOR

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OK, check for spark in each spark plug wire using the spark tool.

Then, check that all of the injectors on the 4.9L engine are working by listening for clicking with the assistance of a stethoscope on each injector.

If either system, spark or fuel turns out to be bad, the computer might be the culprit.

I have a 1990 Cadillac Deville that would miss badly due to a fuel injector not firing, and it turned out to be a bad computer.

One can get one for about $80 from a salvage yard.

Posted on Oct 14, 2010

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Hi! Two things to look at. The TPS (throttle position sensor) may be faulty that's why it sputters. Have the MAF (mass air flow) sensor be checked too. If you have a faulty MAF you'll have unusual idling and the engine may go off. Hope this shed some light and thank you for using FixYa!

Posted on Oct 13, 2010

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1 Answer

I have an 88 Cadillac Deville. 2 months ago I had a new fuel pump put in. It's making a whining noise and the car keeps dying and sputtering. What else could be the problem to make the pump go out?


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1 Answer

1994 Cadillac DeVille. Why is it sputtering, backfiring and shutting off while driving?


Could be one of several things:
  1. Bad ignition coil or coil wire;
  2. Bad plug wire(s);
  3. Timing belt slipped or broke;
  4. Static timing off (unlikely, unless distributor came loose);
  5. ECU defective;
  6. Contaminated fuel (requires complete fuel replacement);
  7. Bad crankshaft position sensor;
Best place to start your diagnostic is by reading out stored codes using an ODB-II reader, and check the systems indicated by the codes.

May 11, 2015 | Cadillac Cars & Trucks

1 Answer

Replace ignition wires 1993 cadillac deville


Not sure I understand the question.
If you are replacing the switch and the wiring plug you would splice the wires together.
Do you need the diagram for the switch ?

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Jul 28, 2013 | 1993 Cadillac DeVille

1 Answer

1992 Cadillac Deville ideals really slow and miss's when I step on the throttle


Do this frist and then if the miss is still there have the spark plugs and plug wires replaced.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Aug 07, 2012 | 1991 Cadillac DeVille

1 Answer

1993 deville 4.9 missing at idle and intermittant missing at speed. Has new wiring harness new plugs, new ignition coil etc


CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS,CLOGGED FUEL INJECTORS WILL CAUSE ENGINE TO MISS, MAKE SURE SPARK PLUG GAP IS 0.060, LEAN MISFIRE FROM WEAK FUEL PUMP,CHECK FUEL PRESSURE SHOULD BE 40 - 50 PSI. IF EVEVY THING CHECK OUT OKAY,MISSING PROBLEM COULD BE LOW CYLINDER COMPRESSION OR INTAKE MANIFOLD AIR LEAKS.DO A COMPRESSION TEST IF NECESSARY.

Apr 08, 2011 | 1993 Cadillac DeVille

1 Answer

My 1995 Deville has a idling issue, replaced new water pump, map sensor and idle control valve...still not fixed. .any sugestions??


Many times this issue can be caused by a dirty air filter, I would start there if you already
haven't done so.

Also, if you haven't recently changed your spark plugs and wires you may consider pulling
out atleast one spark plug to look at its condition.

Jan 22, 2011 | 1995 Cadillac DeVille

1 Answer

1993 cadillac deville sputter whjen excelarate adn also when idleing then cut off new plugl aND CAP AND WIRES INSTALLED ALREADY THE PROBLEM IS STILL THERE


Run a compression test or take it to a shop and have it put on a scope, you need to make sure you have the basics of a good engine first, while misfires can and usually are electrically related they can be from mechanical problems as well. With a scope you can isolate the cylinders that are at fault and also stick a vacuum gauge on the engine to see if it is steady no needle bouncing around, which would indicate valves, cam etc.

Oct 13, 2010 | 1993 Cadillac DeVille

1 Answer

I recently installed a fuel pump on a 1993 cadillac deville. i also changed the filter,emission control,plugs and wires. it fired up and ran for about 14 minutes. it ran very sluggishly then quit. i have...


was it the correct fuel pump with the propper psi?
have you checked you wires to make sure none got crossed. are the spark plugs propperly gapped?

Mar 07, 2009 | 1993 Cadillac DeVille

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