Question about 1990 Cadillac Deville

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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

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  • 30 Answers

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.

Posted on Nov 15, 2014

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Posted on Jan 02, 2017

  • 16 Answers

SOURCE: 94 buick park ave runs great but with a light load

Several possibilities having to do with the torque converter clutch and TCC solenoid:

1. Replace transmission fluid, use a synthetic Dex VI, do a complete flush with pan removal and filter replacement

2. Check all grounds related to the transmission control solenoids, clean them and ensure good electrical contact.

3. Rebuild transmission, the TCC friction material is worn out.

Posted on Jan 07, 2010

  • 286 Answers

SOURCE: When putting van in gear the engine runs rough

how about putting the van in drive with one foot down hard on the brake and rev the engine, does it smooth out now? if it smooths out, i would pull the air cleaner tube to the throttle body and spray the throttle body with carb cleaner, be careful if using the red tube, I have had it blow off before into the intake, not good, open the accelerator and spray it out really good, it will to start until all the cleaner clears out.

Posted on Jun 29, 2010

  • 25 Answers

SOURCE: 1999 Cadillac Deville Transmission rattling

Could be tranny mounts, or it could be your differential going bad. Also, if you have a 4.9 instead of the 4.6 Northstar then there has been an engine swap, and you could be experiencing ATM or ECM problems.

Posted on Jan 09, 2013

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1 Answer

Grinding when applying gas engine temp light dings on but doesn't stay on it happens when I try to dig deep and when im shifting gears but then it smooths out at a constant speed


the light could be low coolant level sensor in the radiator top tank
Acceleration moves the water away from the probe breaking contact and putting the light on
grinding could be from a failing cv or "U" joint in a drive shaft

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Converter seems to be clogged... That sounds like all the symptoms of a converter

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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

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1 Answer

When putting van in gear the engine runs rough


how about putting the van in drive with one foot down hard on the brake and rev the engine, does it smooth out now? if it smooths out, i would pull the air cleaner tube to the throttle body and spray the throttle body with carb cleaner, be careful if using the red tube, I have had it blow off before into the intake, not good, open the accelerator and spray it out really good, it will to start until all the cleaner clears out.

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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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I would first replace the FUEL FILTER. If problem persists, make sure exhaust is not partially clogged like a clogged catalytic converter. Hope this helps

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have ypu checked the fluid level in it? if the fluid level is good, you might want to replace the fluids in it

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