Question about 1994 Cadillac DeVille

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Service engine soon light

My service engine soon light comes on when my car idles. Why?

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This could be the shocks that needs changing,I have the same problem and they do cost alot.I am presently trying to substitute the original but still waiting for an answer.

Posted on Sep 15, 2008

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Posted on Jan 02, 2017

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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

2002 Buick Rendezvous CXL will idle very high & idle too low & stall when going slow or stopping.Replaced IAC valve. Service engine soon light not on, but service vehicle soon light always comes on.


Check for applicable trouble codes. Some of the national brand auto stores will check codes for free.

You may need to clean the throttle body and clean those small passages. With a high idle block off mouth of throttle body, should have a big effect on the idle? There are several issues that could cause idle to act up. Vacuum leak--maf and or map sensor. Don't replace anything unless testing points you in that direction.

Nov 18, 2015 | Buick Cars & Trucks

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I have a 2008 Beetle with a 2.5 litre engine. The engine service soon light has been coming on for the past 4 to5 months. We have replaced the spark plugs, number 5 cyl coil, changed the battery, serviced...


In most cases the check engine light indicates a sensor is bad. Have a mechanic scann it and if so replace it.....hope this info helps and if so Please leave rating on this post and good luck..

Aug 15, 2012 | 2008 Volkswagen New Beetle

1 Answer

Service soon light on,cuts off when at idle,hard to start back.


The information below was complied by me, it explains what causes the check engine light or Service Engine Soon light to come on and the process of finding the cause.

When the Check Engine light or Service Engine Soon light (depends on make) is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.


Mar 17, 2011 | 2000 Nissan Altima

1 Answer

When ever the reduce engine power light comes a 2002 trailblazer 4.2 the suv act like it dont want to change gears and idles real high.


Need to have the engine scanned to see what part of the system is causing the service engine soon light to come on and to see what's causing the idle to be really high.

Aug 06, 2010 | Chevrolet TrailBlazer Cars & Trucks

2 Answers

Service engine soon light is on again....


buy yourself a scanner [ebay] only cheap & learn to do it yourself with its manual it comes with alist of error codes & their meaning
costs less than the last time!

Jul 20, 2009 | 2007 Nissan Sentra 2.0 SL Sedan

1 Answer

(1995 Cadillac Eldorado) - Service Engine Soon light is on.


If this problem just started I would try to get a jump on it. It will be easier to track down if the light just started coming on. Otherwise other problems may come into play and the mechanic will need longer to sort them out. At around 70.00hr.Cheapest fix is to try and drop in a set of plugs. Good luck.

Jan 11, 2009 | 1995 Cadillac Eldorado

1 Answer

1994 s10 service engine soon light


Have you had the truck scanned for codes? If so, what was the code, codes? Why did you replaced those listed parts. Can you hear any hissing noise coming from the engine or engine compartment?

Sep 04, 2008 | 1994 Chevrolet S-10

1 Answer

Service engine soon light


You need to have the vehicle scanned or pull the code out with a code reader,and address/fix the code.If you do not repair the problem,you can clear the code,but the service engine light will come right back on.To clear the code,you can disconnect the negative terminal on the battery for at least 20 minutes,then reconnect the battery,but the car is going to be hard to get to idle,because sometimes the computer has to relearn how to idle the engine without stalling.Good luck.

Jul 10, 2008 | 2002 Buick LeSabre

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