Question about 1991 Cadillac Seville

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Mph car goes to 45 46 mph then loses speed with gas pedal down max speed 45 then a whiny sound oil is rich

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  • KellOfWax Feb 11, 2009

    I'm having the same problem, but I replaced the catalytic converter, to no avail. Same problem, getting worse every day. Now, it's starting to die randomly. Thinking fuel filter and/or injectors. Any help??

  • Anonymous Mar 22, 2014

    The car will start when I give it gas but will cut off as soon as I release the gas pedal. I also notice oil on the ground, black and thick. Please help!

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  • 52 Answers

Sounds like a burnt out catalytic converter. I had this problem with one of my sons caddy's we replaced the CAT and it was fine. But it could be the the fuel injector (s) are clogged. Do you use injector cleaner when you gas up once a month??

Posted on Oct 13, 2008

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Loud ticking noise on driver side as speed hits 50mph gets louder as mph goes higher but noise gets quieter when mph goes down. If I do not reach 30-45 mph it will not tick, what is causing it


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When slowing down the transmission feels as if it is jerking in to the next gear.


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into drive,let car accelerate without any gas(do not touch pedal)to max speed (about 30/35mph).stop,then with 1/3rd gas pedal,accelerate to max speed(do not move foot)stop,then foot hard to floor,upto about 60mph,then stop.then only using a max of 1/3rd gas pedal,drive for about 15miles.you have just reset the drivetrain computer setings....the car is fitted with a computer controlled fuzzy logic gearbox,it will try to make you drive as eco as poss,but if used harshly the gearchange can be harsh up and down.....
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from standstill,put car in drive,no gas,and let the car reach max speed(about 30 ish)then.
from standstill using 1/3 gas pedal (do not move gas foot)let the car accelerate to max speed.
lastly, put car in drive and floor gas pedal(make sure you are alone)then
drive as economically as you can, the gearshift patern will then adjust to your driving style(takes about 50 miles)You will feel the car go from fluid to mechanical drive as a kind of slight drop in revs then ...engage.
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