Question about 2002 Cadillac Deville

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I have a 2002 Cadillac deville 106,000 miles engine lopes unsteady revs up to 650 rpm in drive while stopped at a stand still. It then drops to 500 irregularly almost stalling the engine only does it when warm. Just got it out from the dealer who replaced the map sensor and told me it was fixed but obviously not. Please give me some direction on this I have obd ll scanner and very mechincally inclined but broke because I don't have another four hundred dollars for another dealer visit

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  • Cadillac Master
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Well the dealer should take care of it for free if it is the same problem. Call them and take it back.

Posted on May 29, 2017

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  • Cadillac Master
  • 786 Answers

Try unplugging vacuum line from the EGR valve and plug the hose with a 1/4 inch bolt.

Posted on May 29, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

emissionwiz
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SOURCE: 2002 Cadillac Coolant sensor

The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment

Posted on Oct 08, 2008

MrScary66613
  • 1990 Answers

SOURCE: 1997 CADILLAC DEVILLE D' ELEGANCE need to replaced air suspension

Try going to a Local Mechanic or Repairing them Yourself. Either way is a LOT Cheaper.

Posted on Jan 21, 2009

  • 202 Answers

SOURCE: MAP sensor 1994 Cadillac Deville

The map sensor shouldn't cost more than 50 bucks or so. It is very easy to change, and can be done w/ simple tools. It mounts to the intake manifold. There is a wire connector that plugs into it. Just remove the two mounting bolts, and the connector, and it will pop right off. This is not a tough repair, so it can be done in about 10 minutes at most. This should save a trip to the repair shop!

Posted on Mar 27, 2009

  • 94 Answers

SOURCE: 2004 SRX Sputters, looses power, and stalls, on occasion

You would be better off going to a Cadillac Dealership and paying the diagnostic fee. Spend $65 to find out what the real problem is rather than replacing parts until the car runs properly. This way you get it from a Cadillac Technician. Once you know what the problem is you can decide on where you want to have it service. Because you are paying for the diagnostics you shouldn't feel obligated to have it done at a Dealership. Please leave me good feedback if you feel this has helped.

Posted on Jul 09, 2009

1fastbob
  • 301 Answers

SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Posted on Oct 22, 2009

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Hi I drive a 2006 corrolla with 70,000 miles. I noticed the idle slowly but surely gettin a litttle rough and lower. This only starts to happen after I have been driving for about 5 min. It usually happens...


It's been almost 2 years since you posted the question so it's likely you will not see my answer to your question.

First, do NOT make any adjustments to your throttle body idle setting. The screw most likely never budged since 2006 so you should not touch it since this is not the root cause. But yes it is wise to check all vacuum lines as "craig" suggested.

I have a 2007 Corolla CE, 1.8 liter VVT engine, 5 speed manual transmission which I bought new from the dealer. Currently has about 108k miles on it. After about 4 or 5 years in cool to cold weather it started doing the same thing. I researched it online then asked my local Advance Auto Parts person who confirmed my hunch. It is known as "idle hunting" when the engine is cold, in colder outside temperatures the idle rpm's will increase up to roughly 2000 rpm then drop to idle, then back to 2000 rpm, then repeats multiple times. Then after driving a short distance, stopping and running at idle, the idle speed may drop to 600 or 500 or as low as 400 rpm, running quite roughly but still keeps running. My Corolla normally idles smoothly and steadily at 800 rpm when warm or hot. The idle hunting or low idle rpm will typically correct itself when the engine warms up enough.

The problem: the intake manifold gasket has aged and shrunk a bit, allowing engine compartment air to get pulled directly past the gasket and into the cylinder head intake port. This causes an imbalance between the reduced air filter airflow sensed by the Mass AirFlow (MAF) sensor versus the actual air/fuel ratio versus the engine rpm versus the oxygen level in the exhaust stream. The gasket will shrink more as the temperature under the hood drops, allowing more air to flow past the gasket. The Engine Control Unit (ECU) is simply trying to do its job as programmed by increasing fuel delivery to compensate for the overall imbalance, then when rpm's get too high it will reduce fuel delivery.

The solution: purchase a new intake manifold gasket for roughly $10 to replace the stock gasket. Mine is a thin orange polymer gasket with round cross-section which seals around all 4 intake ports. You can search for instructional video of how to install it on YouTube.

I purchased one but did not install it yet. I am sure this will resolve the problem since all other suggested fixes I found on the internet did nothing but unnecessarily frustrate the owners.

Apr 03, 2011 | Toyota Corolla Cars & Trucks

1 Answer

My car dies when I drive for a short time.


Check O2/mapp sensor. Also if you can elaborate on the behavior of the engine as it stalls, is there smoke, does it race then suddenly die out or does it barely run at a very slow unsteady idol until it floods out?
Check O2/mapp sensor. Also if you can elaborate on the behavior of the engine as it stalls, is there smoke, does it race then suddenly die out or does it barely run at a very slow unsteady idol until it floods out?
Answering with as much detail as possible will help get a more definite answer.
Good luck.

Apr 04, 2010 | 1985 Cadillac DeVille

2 Answers

2002 Hyundai Elantra 100k miles - 2.0l - running rough


sounds like the throtle position sensor is miss alined or the idle screw is backed off

Dec 16, 2009 | Hyundai Motor 2002 Elantra

2 Answers

Mr.


sounds like a misfire (dead hole)

Nov 11, 2009 | 1995 Cadillac DeVille

1 Answer

2004 clk 500 unsteady idle rpm, could it be the


RUN down to Advance Auto Parts and buy a can of "SeaFoam" and add to your gas tank per instructions...drive for at least 100 miles and the problem should be gone. If not, one or more of your O2 sensors are most-likely fouled (lousy fuel quality these days).
Good Luck

Jun 22, 2009 | 2004 Mercedes-Benz CLK-Class

1 Answer

2002 chrysler concorde lx low idle


with a 2002 Concord 3.5 V-6, what should the rpm be at 60mph? 70 mph?

I'm not sure if the overdrive gear is lost in the tranny, but the transmission light is on.

Thanks

Apr 05, 2009 | 2002 Chrysler Concorde

2 Answers

Intermittent High Idle, Dies on cold starts, bad mileage


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

Feb 01, 2009 | 2002 Cadillac Deville

2 Answers

Motor is reving up and then back down


torn intake boot on 2000+ Northstar requires removal of intake manifold along with injectors-about 4 hour job not just 2 clamps as suggested. New seals required could also run past $100 so $500 is not unreasonable

Dec 26, 2008 | 2002 Cadillac Deville

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