Question about 1991 Cadillac DeVille

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1991 cadillac deville .

Was getting 21 gallons per mile went down to 12 miles per gallon not getting any bitter how do i fix

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  • Anonymous Jan 02, 2009

    i have the same problem dont know what to do help me tooo any one

  • tomcat10 Jan 05, 2009

    No obvious symptoms, it just started to get 3-4 MPG less. It could be a bad plug but I cannot see how to remove the plugs.

  • Anonymous Mar 17, 2014

    my 1991 cadillac deville is idled up to high and need help to fix the problem

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1991 Sedan DeVille runs great but starting occasionally gives me trouble. Starter strains to turn over. Have taken this in to two mechanics and neither could duplicate the problem. Electrical checked out ok. Today it finally gave up the ghost. Engine was warm but it wouldn't turn over, click or anything. One guy came by and said his friend had a similar problem and it turned out to be a sensor. I can't figure out which sensor could cause this problem. Any ideas email me at valentinebarbara at hotmail dot com.

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Posted on Oct 12, 2008

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Did this happen overnight

Posted on Sep 22, 2008

  • blaze042078 Nov 13, 2011

    My 91 sedan deville is doing same and sputters when gave gas and has gone from 22mpg to 11.4 and happened fast replaced plus wires distribator cap and rotery button and keeps droping mileage can some one help me

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I changed my fuel pressure regulator in my 92 sedan deville and now i get worse miles per gallon than before


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I have a 1987 cadillac deville with apoox 85000 miles on it fuel pump went out I drop the tank and replaced the pump. I can not get a proper reading on the fuel guage (digital) I have taken the gas tank...


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If I've travelled 2082 KL in a 12 month period how much fuel would I have used in an SUV


Depends on how you drive, how long you let it warm up, etc. If it was getting say 20 mpg, it would use about 65 gallons to go 1294 miles (2082KM), Do you know how to check your fuel mileage? When you fill up, zero the trip meter, or write down the miles, next time you fill up, get a receipt with gallons (liters) on it and write down the miles, divide it by the number of gallons, this is miles per gallon. 200 miles divided by 10 gallons equals 20MPG . zero the trip odometer again and next tank you can figure it again. I write the miles on my reciepts so anytime I want I can check. Hope this helps.

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I change my plugs now I get 8 miles per gallon & car shuts down after travling 20 miles


What brand of spark plugs did you use? I typically like to use AC Delco Platinums for anything GM. They must also be gapped properly. If it has the 4.6L, they should be gapped at .050" (1.27mm)

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1987 cadillac gas milage went from 15 miles around town to 8.5


this is what I would do. I have the 1993 model and get 22.5 to 23 miles per gallon.
I would change the plugs, change the plug wires, change the fuel filter, change the air filter.
if you have done this lately then one overlooked item would be the coolant thermostat.

when you first crank the car and the engine is not warmed up, it runs in a "closed loop" mode and it gets bad mileage. the computer doesnt care about mileage at that point, it just wants it to run good.
after the coolant gets up to temperature, there is a coolant temperature sensor ( should be located screwed into radiator somewhere) that alerts the computer it is up to operating temperature. the computer then goes into a "open loop" mode and the computer then constantly changes the air fuel mixture to make the best out of emissions ,milage, and power,...
so, it it is not getting up to temperature it could be the coolant thermostat is stuck open. if you cant remember when the last time its been replaced then you may want to go ahead and do it.
if that dont work, it could be the coolant temperature sensor itself.
When I was carpooling in my caddi I drove 7 miles down the road to catch my ride. I get 15 miles to the gallon. and spend more on gas then if I just drove by myself. when I drive to work my self (35 miles) I get 23 miles to the gallon with stop and go averaging speed of 50

Apr 29, 2009 | 1987 Cadillac DeVille

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