Question about 1990 Cadillac Deville

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1990 cadillac deville 4.5l runs rough and missfires. Checked fuel pressure and for vac. leaks, both ok. have replaced plugs, wires, cap, rotor, performed injection service. no results. Hooked to scope and diag. bad distributor. repaced distributo, still have same problem. What next?

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  • Cadillac Master
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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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Posted on Jan 02, 2017

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1992 Cadillac Seville 4.9L hard starts and runs very ruff,then will not stay running.Awful smell of gas as well.


you may have bad or very dirty fuel injectors causing too much fuel into the cylinders causing rough running and smell of gas. do you have a fuel leak or too high fuel pressure.

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2000 gmc jimmy 4x4 p0300. Replaced cap, rotor, wires, plugs, map sensor, checked icm. Nothing has helped


Just a thought,pull the dist.cap and make sure the rotor has
no side to side play ,thinking maybe a bad upper bushing in
the dist.Also,if the EGR valve has carbon and soot built up
on the piston it will make it idle really poor ,but run ok.
Might pull the EGR and clean it with intake cleaner.
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I have a 1991 Cadillac Deville with a V8. It won't pass smog. Has high co. I replaced the egr valve, charcoal canister, spark plugs, spark plug wires, cap and rotor, catalytic converter, oxygen sen


Hello! when you say you checked the MAP sensor what do you mean? Did you take voltage readings at idle ? A vacuum leak is the likely culprit, especially to the MAP...The minor shake at idle being the major clue...Send a comment...guru..saailer

Dec 24, 2011 | 1991 Cadillac DeVille

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Tuned up car changed 02 sensor full tank of fuel still running rough


Oxygen sensor only report the condition of the engine the rough running condition can range from a worn sparkplug wires to worn sparkplugs to valve problems to injector problems. with the cadillac deville a tune up should be the first attempt to smooth the rough idle with the inspection of the cap and rotor cap and rotor do have a tendancy to arc internally and create misfire so does sparkplug wire that can leak spark voltage to ground and create misfire. the spark plug wire especially if they are brittle and hard can create issues

Apr 23, 2011 | 1990 Cadillac Deville

1 Answer

Car was running great. driving home all of a


Here are a couple of guesses for things to check: vacuum leak (low vacuum pressure), worn distributor cap or rotor, incorrect timing, clogged fuel injectors, malfunctioning fuel pump (low fuel pressure), ignition module on its way out. I hope these suggestions help you out.

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Car off rd for 1yr. when i picked car up drove it ran rough on like 6 out of 8 cyl 1990 cad deville, mech. checked every thing said posibly fuel injectors at cyl 2and 4, car runs rough, miss or stalls new...


did you use the gas that was in the tank? when gas sits for that long the oil and water separate. this is the most common reason that cars run like **** after sitting for so long. you may want to siphon the old gas out and put new in.

Apr 24, 2009 | 1990 Cadillac Deville

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