Question about 1991 Cadillac DeVille

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Hi im bout to but a 1991 cadillac sedan deville its a v8 the guy im buying it from said it was running a little rough so he took it to a mechanic and had platinum plugs new wires distributer cap all put on it but i guess the 8th valve he says is bad and the \7th valve is only pushing a compression of around 70. he said the 2hr drive on the highway bringing it home may improve that though what is really gonna happen and how much is it going to cost me

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The engine is junk, do not buy this car! You'll be looking at a $4000. repair bill.
I love his rational though...the further away you get, the better it will be. Ya, for him!

Posted on Feb 03, 2010

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I was hooking a new stereo up in my 1991 Cadillac sedan deville and sparked a wire and now its running rough. what could it have did?


What you did was sent 12Volt Power through the Entire car. There is no way for ANYONE to know what damage you have caused. The Computer could be fried, Sensors, the list goes on and on as you can tell about putting the Old Stereo in and it working..

This is the same as Jumping your car and putting the wires on backwards... Only Worse, you bypassed the Security Features of the Fuses....

Sorry but you are going to have to troubleshoot every system to find out what damage has been done

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Engine wont start, BCM just replaced, inflatable restraint and check engine light on.


need to start with do you have any obd code with key turned on
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Sep 29, 2012 | 1991 Cadillac DeVille

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Can anyone tell me an accurate price to replace a bad generator with an alternator on a 1962 Cadillac Sedan Deville. My local mechanic wants to charge me $1200 and that seems a little expensive.


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If none of the 4 doors work check the relay for no fuse runs it. It is attached to a breaker although that breaker runs to the windows as well

May 22, 2010 | 1991 Cadillac DeVille

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Hi im bout to but a 1991 cadillac sedan deville its a v8 the guy im buying it from said it was running a little rough so he took it to a mechanic and had platinum plugs new wires distributer cap all put on...


You don't want to buy a car with bad valve/s. The engine is losing compression in those cylinders and will end up rebuilding quickly or sitting on the road for a tow. Just hope you look at another CADILLAC and let this one pass. Engine failure waiting to happen

Feb 03, 2010 | Cadillac DeVille Cars & Trucks

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88 deville wont shift into 3rd gear,im wondering if it is the pressure switch.


Possibly in a "Safe" or "Limp home" mode. If so, have a look at the wiring harness on the transmission. I'll bet that the seal around the lid on it is failing. Clean the harness up, and reseal the lid on. If this does not fix it, have a mechanic look at the shifter linkage.

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Replacing a 1991 cadillac sedan deville air compressor


The lines should be differant sizes.. Did you check it? Ther should be a diagram on the cover over your radiator showing you the set up.. Hope this helps..

Aug 26, 2009 | 1991 Cadillac DeVille

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1991 cadillac deville .


did this happen overnight

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