Question about 2002 Cadillac Deville

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1999Cadillac deVille runs rough at start up, but quickly smooths out. Replaced plugs and wires. Didn't help

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  • Cadillac Master
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Sounds like coolant leak into the cylinder(s). Pressure test cooling system, when unit is heated up. Pull plugs, leave under pressure. turn over, any fluid spraying out of plug holes.... Pretty expensive to fix, as the North star has head studs that fail in the block.

Posted on Aug 01, 2010

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Related Questions:

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Runs smooth then runs rough & rough back to smooth running.


If your check engine light comes on get it checked. To me it sounds like an engine misfire probably cause by a coil pack or spark plug wire going bad. The misfire should cause the check engine light to come on maybe even flash if the misfire is bad enough

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Have a 1990 cadillac deville engine runs smooth in park/,neutral when iput in gear and accelerate it shutters changed plugs / wires no help could it be tranny or cv joint no noises from either


Does idle rough in gear if so may have bad fuel injectors. not saying that it is not transmission or joints, need to make sure the engine is running properly first.

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Sep 12, 2012 | 2000 Pontiac Sunfire

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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

When i first start my car up it runs a little rough. i have replaced spark plugs, wires, a code code comes up and says it is running lean. after the first start of the day it runs smooth until it sits in...


a code for lean or lean condition typically indicates a vacume leak ,lean refers to too much air or not enough fuel too much air or more air than expected "leans" the fuel mixture, usually a vacume leak or a leak in the air intake system is the problem also i would have the coolant temp sensor checked out

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1 Answer

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...


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.

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2 Answers

Under heavy acceleration the car stumbles, runs rough


I am having the same problem with my mustang, have replaced tps, egr valve and sensor, clean maf, new plugs and wires, new fuel filter, cleaned throtle body and still having same problems....Please help!!!!!

May 29, 2009 | 2002 Ford Mustang

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