Question about 2002 Cadillac Deville

2 Answers

Intermittent High Idle, Dies on cold starts, bad mileage

I have a 2002 Cadillac DeVille with 131,000 miles on it. It has the 4.6 NorthStar motor and digital dash. Recently, when I pulled in my driveway and put it in "Park" the RPM's raced to like 1800 RPM. I tapped the accelator thinking maybe the choke was stuck or something, and it rev'd even higher to 2300 RPM. After about 30 seconds it slowly came back down to normal RPM's in the 625 range. I shut it off and wrote it off. Today it did the exact same thing to me. Only this time, after I started it again it died. I started it again, it died. AND again only this time I pressed on the accelerator and it started cutting out. Finally it ran ok. It also seems to be getting horrible gas mileage. 12.5 MPG average. Any clue what might be the problem here? Any input would be greatly appreciated.

Posted by on

  • harleynut102 Feb 01, 2009

    Thanks to dbwest for your input. Greatly appreciated. Brian, I am going to my friends house tomorrow and he has one of those OBD II. I will get the codes and post them tomorrow. The "Service Engine Soon" light is on. I appreciate the help guys. I will get the codes posted early afternoon tomorrow. Have a great evening.

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 150 Answers

These cars are notorious for intake manifold leaks. This could also be a throttle position sensor. If you have a MIL (check engine light) I would scan it with an OBD II scanner and pull the relevent code off the scanner it will give us a much more accurate direction to proceed

Posted on Feb 01, 2009

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 10 Answers

Check the EGR valve. if the valve gets stuck open the rpms will rev up to prevent the car from stalling. this will happen if the car has been driven on the highway for a extended time on lower mileage cars. sometimes you might also notice that the ac cuts out after long highway  driving when the valve sticks open 

Posted on Feb 01, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How to check coil packs and spark plugs wire with a multimeter. ..having random/ multiple misfire P0300...need to know their spec? 97 Cadillac Deville, 4.6 engine/Northstar


I don't think you really understand what this fault code means, it means that likely all the engine cylinders are misfiring at random no set pattern, not any particular cylinder. I would start with checking for engine vacuum leaks like the intake manifold gasket. that is all I can say since you provided no make, model or year and engine type and size information.

Sep 21, 2016 | 1997 Cadillac DeVille

2 Answers

Check engine light flashing check engine soon smell of gas and not running smouth


Check engine light flashing means there is a bad misfire , it flashes to tell you your damaging your catalytic converter . You need to have it check , you don't won't to have to replace the catalytic converter . Can cost up to $1,000.00 . Flashing Check Engine Light CarMD

Feb 03, 2016 | 2004 Cadillac Deville

1 Answer

Please help; my Cadillac Concours 1995 use fuel ? tooooooooo much in 100 km use ? 35 liters (9 gallons) without any smoke or missing. What is problem and how can I fix it????


Cadillac DeVille Mileage ' Fuelly

www.fuelly.com > Cars > Cadillac
There are 53 Cadillac DeVilles with reported gas mileage parked at Fuelly. ... Any Submodel, d'Elegance (1), DTS (1), Concours (2), DHS (4), Base (13), Other (32) ... 4 Vehicles; 27 Fuel-ups; 5,215 Miles Tracked; View All 1995 Cadillac DeVilles ... 2 Vehicles; 9 Fuel-ups; 1,664 Miles Tracked; View All 1991 Cadillac DeVilles.

Used 1995 Cadillac DeVille Features & Specs - Edmunds.com

www.edmunds.com > ... > DeVille > 1995 DeVille

Edmunds.comFeatures and specs for the 1995 Cadillac DeVille including fuel economy, transmission, warranty, engine type, cylinders, drive train and more.Missing: 100km

Cadillac history 1997 - Motorera

www.motorera.com/cadillac/cad1990/1997/cad97d.htm
History of Cadillac automobiles for 1997. ... 1997 CADILLAC DEVILLE ... Fuel Economy City/Hwy, 13.8 l/100 km - 9 l/100 km (20.4/31.2 mpg-imp) (17/26 mpg US).

Jan 25, 2016 | Cadillac Cars & Trucks

2 Answers

I recently bought a 2002 Cadillac deville the steering column has been changed and the car will not start


Cadillac Deville 2001 won't start, engine won't ... - CarGurus

www.cargurus.com > Questions > Cadillac > DeVille

CarGurusJan 21, 2014 - Cadillac Deville 2001 won't start, engine won't turn over - My cadillac won't start. ... Crank not starting - service theft system in dash: There are 2 starter ....I have a 2002 Cadillac ... that all of a sudden stopped turning over ...

2001 cadillac northstar cranks but wont start. - YouTube

? 3:50
https://www.youtube.com/watch?v=t5SBKPut7G8
Mar 30, 2014 - Uploaded by eastcoasthoopty
2001 Cadillac wont start thought it was the chip in the key but it was ... I have a 2002 Seville In the morning I start my car noproblem, once its ...

Cadillac Deville 2001 won't Start - YouTube

? 0:43
https://www.youtube.com/watch?v=aUdX_Vnt1qI
May 10, 2013 - Uploaded by Shane Moore
Cadillac Deville 2001 won't Start .... i have a 2002 cadillac DTS. My issue is it will not idle, it will not start unless you have your foot to the gas all ...

2001 cadillac deville starting problem - YouTube





Dec 29, 2015 | Cadillac Cars & Trucks

1 Answer

2002 Cadillac Deville Blower motor


Try checking the ac relay.Thank you for asking and I hope this helps you.Please leave me a 4 thumbs up.

Jul 20, 2010 | 2002 Cadillac Deville

1 Answer

Overheating engine, no leakage, some white smoke when cold,


1 st drain the oil if excessive for it will just aggitate in the oil pan and it will not pump through the oil pump resulting in internal engine damage. The belt should be replaced every two years on any Northstar motor. A tune up is also recomended as well with high milage

Feb 04, 2010 | 1998 Cadillac DeVille

1 Answer

1994 Cadillac Eldorado Northstar High idle


I am not sure if this will help you but PO27 is listed as "Open Throttle Signal Switch" which could mean that your throttle position sensor needs replacing. Although with Cadillacs, it could mean anything. I hope this helps...

Dec 15, 2008 | 1994 Cadillac DeVille

Not finding what you are looking for?
2002 Cadillac Deville Logo

871 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

60867 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...