Question about 2001 Cadillac DeVille

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Why does my cadillac deville run rough for the first minute or two after starting it up in the morning?

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Choke not operating correctly, may try some carb cleaner spray on it to let it work more freely, G/L

Posted on Mar 19, 2011

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Where do I find the knock sensor on a 1994 cadillac deville 4.9 engine?


Knock sensor is on the right (passenger) end of the engine, and will activate if at least one of the cylinders is misfiring. Your rough running engine can be caused by many many issues - I suggest you start with plugs and plug wires.

Oct 10, 2014 | 1994 Cadillac DeVille

1 Answer

My 1996 Cadillac Deville takes too long to start if it hasn't ran for a while, and when it does start, it runs rough for at least 15 seconds.


Check fuel pump & pressure,may be failing

Have you worked on the car at all, in the last couple
years, or just driven it,that could be a factor also

Mar 27, 2013 | 1996 Cadillac DeVille

1 Answer

1991 Cadillac Sedan Deville idling rough


True of many cars. Happened to me too many times, fourin
or domestic.

Dec 03, 2012 | 1991 Cadillac DeVille

1 Answer

At startup, car runs rough. After short time it clears up and runs ok. I put in Seafoam to remove possible moisture in gas.


Have someone start it for you in the morning while you stand behind the car. After it starts, smell the exhaust. See if it smells sweet, kind of like maple syrup. Also are you having to add antifreeze. If yes to both, you might have a head gasket starting to seep.

Jun 17, 2010 | 2002 Cadillac Deville

1 Answer

When i first start the car it runs rough and when I take off it blows out a gray cloud from the exhaust and then runs fine and idles fine at lights and stop signs, Only a problem when I first start it


My 1997 cadillac deville started up rough for the first 15 seconds then the problem went away as I ran it. Also, it blew a cloud of sweet smelling fluid when I would shut it off hot and restart a few minutes later.It's a blown head gasket.

But, there is a $33 solution from Bar's Leaks that worked for me from Advance Auto. It's available at most reputable auto parts stores. If the leak is small enough it will seal.

Jun 08, 2010 | 2000 Cadillac DeVille

2 Answers

Ot fire.1999 Cad. Deville (41,000 miles-Northstar). Started engine this morning (14 degrees F) and the car was idling as normal. After a few minutes, it began to idle rough and eventually stopped running....


Hi there. Sounds like it could be fuel pressure. Did you try unscrewing the cap on the fuel rail to see if fuel sprays out or just drips? I'd check that first..

Jan 11, 2010 | 1999 Cadillac DeVille

1 Answer

97 deville northstar was running fine now wont start


The faulty component was the fuel pump relay.

Apr 18, 2009 | 1996 Cadillac DeVille

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