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94 Cadillac DeVille: Car would only run for 20

94 Cadillac DeVille: Car would only run for 20 minutes then shut off and not restart. I replace coil, had Ignition module tested, tested pickup coil and anti theft in steering column. Could it be the PCM? Thank you for you're help.

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When the car has the crank/no start, at that point see which is missing. Test for fuel and spark. I think it has to do with fuel, a tired fuel pump or relay. But remember to check the oil sending unit. If it fails it will shut down the fuel system.

Posted on Jun 18, 2009

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My cadiliac is a 1995 sudan deville and it runs for a while then just shuts off after 20 or 30 minutes it will start and go for while the shut down . I have changed the distributer cap ECM and coil dont...


I also have a 1995 Deville 4.9L with the same shut down problem. I replaced the ignition module, with no effect on the problem. So, I took it into a Cadillac Dealer who said it was the "hall effect switch" and lower wiring both of which are on the under side of the distributor. To get to this switch, you need to pull out the distributor assembly. If you do this, you have to make sure you mark the position of the gears.. otherwise you will screw up the timing. I didn't want to sink any more $'s into the car, so I sold it for $2K. Hope you have better luck. Zak

Oct 06, 2010 | 1995 Cadillac DeVille

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I have a 1995 Cadillac Sedan Deville with 109k miles. I bought it new, and it's been without any major problems. Now there is a consistant engine shut down problem after driving or at idle for 7 minutes...


I have a similar issue with a 94 DeVille. Runs for a while then shuts down. Fuel pressure is good (I drove around with a pressure gauge attached and it still shut down with no drop in pressure). I've replaced the idle control and ignition module - no improvements.
I too have code P012 showing which to (potentially) the crank position sensor - which I can't seem to locate.
Any luck on your issue?

Sep 07, 2010 | 1995 Cadillac DeVille

1 Answer

1994 Cadillac deville will start, but once key is released the car dies, No lights on dash and speedometer needle climbs then falls. You can maintain pressure on the ignition switch and the car will run...


replace the computer. 94 el dorado 94 seville 94 de ville computers are the same just make sure its the 4.9l motor u have . because the computer will make the car run real bad if u do not get the correct computer

Feb 01, 2010 | 1994 Cadillac DeVille

1 Answer

94 deville shuts down driving or idling w/n start till cooled down. changed coil and fuel filter, ignition module tested good.


Check the egr system for when the engine gets to operating tempreture the egr should open to keep the engine running correctly

Jan 18, 2010 | 1994 Cadillac DeVille

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94 deville shuts down when motor gets hot


sounds like you are having a coil problem

Jun 12, 2009 | 1994 Cadillac DeVille

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if your cap has a hairline crack in it yes it can make the car run very badly

Aug 19, 2008 | 1994 Cadillac DeVille

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have the converter checked out,,,if its clogged it wont allow the car to run right and youll have no power

Aug 13, 2008 | 1994 Cadillac DeVille

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