Question about 1994 Cadillac DeVille

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I just had the head gaskets replaced on my 94 deville...it came back to me running rough...but running...after checking the spark plugs and wires to make sure they were all good...they are...the guy who did the work told me the timing might be a little off...she does hesitate when I take off from a stop....but I also found a vaccuum line with an open end and Im not sure where that goes...I checked the cruise control diaphram module because the cruise quit working too..but it doesnt go there...any suggestions??

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  • Expert
  • 43 Answers

Check for clogged fuel injectors or fuel filter, and check for bad fuel pump

Posted on Nov 07, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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chiquititas
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SOURCE: 1994 Cadillac DeVille Concourse - Runs rough?

The "check engine" light will "light" when there is a malfunction in the engine management system. The fault code is then stored in the computer. The computer must be scanned to retrieve these stored faults to pinpoint the malfunctioning component. We recommend buying your own scanner and doing it yourself. With a pocket scanner you can check for fault codes to find out why the light came on in the first place. You can clear your cars trouble codes after you replace the malfunctioning sensors.

Posted on Jun 26, 2008

  • 74 Answers

SOURCE: No Spark in 95 Cadillac Deville 4.9

crank senser controls spark and injecters

Posted on Aug 26, 2008

  • 4 Answers

SOURCE: 98 Catera goes into "Limp Mode" after warm up.

have you check you ignition coil packs.

Posted on Jul 21, 2009

  • 534 Answers

SOURCE: 99 deville head gasket leak?

A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Posted on Sep 21, 2009

Testimonial: "thx..my car is not overheating.only had to pull off road once.it does get to 233 sometime."

duane_wong
  • 6826 Answers

SOURCE: 1990 cadillac deville 4.5l runs rough and

Had a computer on my 1990 Cadillac Deville bad, after changing plugs, wires, cap, fuel injectors, egr valve, etc.

The computer was not firing an injector and i had a miss and rough running mostly at 35 mph on the roads. It bucked like a bull.in a rodeo.

Posted on Jul 02, 2010

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1 Answer

We think that it stopped running due to no fuel. the engine ran rough ever since. Seems to be flooding to the point that fuel was getting into the oil in the sump. Running rough ever since.


Get a cylinder compression test done to check head gasket and to check head is not warped or cracked.
if head gasket or head problem = one cylinder may be affected causing fuel could get into the oil via a blown head gasket. if one cylinder not firing it would run rough.

Has the engine been over heated recently ?

May 06, 2016 | Cars & Trucks

2 Answers

Misfire in two cylinders


Check to see if the two cylinders misfiring are on the same coil pack. If so, change the coil pack in question.

This happened to me on 1997 Cadillac Deville Limousine.

Also, check for a blown head gasket with compression test.

Jul 04, 2010 | 2001 Oldsmobile Aurora

1 Answer

1997 cadillac deville- misfires on cylinder #1 when cold and starting up, and also when hot and left off for a few minutes, and then restarted. Runs rough for 15 seconds or so, and then the problem goes...


It sure is. If a plug is truly wet, the energy for the spark will travel through the moisture, rather than across the gap. The fuel air mixture flowing into and out of the cylinder serves to ventilate the cylinder, drying the plug.

Plus, that air is preheated, so that would accelerate the drying once warming up got underway.

You really need to have that head gasket replaced. If this questionable repair gives way (and it almost certainly will), you can get enough water in the cylinder to start breaking things on startup without any warning.

Jun 29, 2010 | 1997 Cadillac DeVille

2 Answers

1999 buick 3.8, was running rough with white smoke.


white smoke tells me engine coolant is mixing with the combustion chamber. you have leaking head gaskets

Feb 07, 2010 | 1999 Buick LeSabre

1 Answer

I have a 1990 Cadillac Deville that has been sitting for approximately a year. I have put a new battery, new plugs, and it has fuel and is getting fuel pressure. It will not start, it turns over but will...


If it was running fine prior to sitting, then the timing is probably OK. If it was sitting because of a blown head gasket then that's another story.
Did you check the pressure with a guage or just by probing the test port and watching fuel come out?
Make sure you are getting spark (probe the plug wire as close to the plug as possible with a test light or remove the plug from the engine, put back in wire and watch the plug for spark). If good move on to the coil, etc. Check the ignition relay.
Check the compression

Jan 07, 2010 | 1990 Cadillac Deville

1 Answer

I have a 94' Jeep Grand Cherokee Laredo. I have white smoke when ever I'm stopped or parked, and it idles a little rough at those times also. I've changed the plugs, spark plug wires, valve cover gasket,...


White smoke generally indicates a blown head gasket or cracked cylinder head, permitting coolant to enter the combustion chamber. You may see a small amount of antifreeze on spark plugs, or, you may see a loss of compression in one, sometimes two adjacent cylinders. Have you had any unexplained coolant loss?
If smoke is present, does it do this all the time or only when first starting? (don't forget, water vapor is a by-product of combustion) Watch other vehicles...is yours smoking more than theirs?
Other than this, intermittent rough running can be caused by nearly anything in either the fuel or ignition system. You will need to check codes and do testing to determine which system(s) need attention. Your spark plugs can also be a good reference when testing. After plugs have been in service for a while, they should all have pretty much the same colouring on the insulator surrounding the electrode...any variation is a clue to which cylinders are malfunctioning.

Jan 31, 2009 | 1994 Jeep Grand Cherokee

1 Answer

1994 Cadillac DeVille Concourse - Runs rough?


The "check engine" light will "light" when there is a malfunction in the engine management system. The fault code is then stored in the computer. The computer must be scanned to retrieve these stored faults to pinpoint the malfunctioning component. We recommend buying your own scanner and doing it yourself. With a pocket scanner you can check for fault codes to find out why the light came on in the first place. You can clear your cars trouble codes after you replace the malfunctioning sensors.

Jun 26, 2008 | 1994 Cadillac DeVille

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