Question about Cadillac DeVille

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2003 cadillac deville rough idle with blinking ses light. Changed the plugs, (AC OEM), Fuel filter, coil (used) Rear, ran lucas injector cleaner last month, Air filters engine and Cabin, Was setting misfire & lien air fuel mixture codes, Then just lien air fuel mixture, now after coil change, car running rough with flashing light

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Have the head gasket checked,pretty common on these

Posted on May 07, 2010

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I added some Lucas fuel injectors cleaner to my 94 Cadillac deville and feels a lil rough while driving? Is this common


possible that the cleaner has loosened up gunk that is now in the nozzle and not spraying properly
run the fault codes

Mar 03, 2017 | Cadillac Cars & Trucks

1 Answer

I have a 97 deville concours with northstar that keeps giving me a P0300 code and SES light?


wrong
cars seldom idle rough when warming up if the injectors and electronics are in good condition
P0300 refers to random misfires which is the rough idle when warming up
the history in the fault codes is the fault report generated but not maintained as the fault rectifies itself
the ses is probably telling you to service the system--clean the injectors , fuel filter or check fuel pressure

Jan 05, 2017 | Cars & Trucks

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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

On my cadillac devill 2003 Rough idleing when it reaches normal tempretuer and check engine light gets on


CODE SCAN VECHICLE SOUND LIKE SEVERE CYLINDER MISFIRE, COULD HAVE BAD SPARK PLUGS OR WIRES.BAD IGNITION COILS,COULD HAVE DIRTY FUEL INJECTORS,SLIGHTLY CLOGGED FUEL FILTER MANY THINGS WILL CAUSE MISFIRE BUT CODE SCAN VECHICLE SEE WHAT CAUSING ENGINE MISFIRE.

Oct 24, 2011 | 2003 Cadillac Deville

3 Answers

2003 SATURN VUE SERIVE ENGINE SOON LIGHT IS BLINKING ON AND OFF RAN THE OBDII READER AND CODE P0304 CYLINDER MISFIRE CAME UP I CHANGE SPARK PLUGS AND BOOTS BUT CAR STILL DRIVES ROUGH SHAKES AND WHEN PARKED...


The P0304 indicates the #4 cylinder is misfiring. The flashing light means the cylinder is not firing at all...It could be several things causeing it, coil, wires, plug, injector or vacuum leak. Do not drive your vehicle until you have this repaired, as it will lead to further more costly problems. Good luck, i hope this helps.

Jul 27, 2011 | 2003 Saturn VUE

1 Answer

I have a 2003 Expedition 5.4L Triton. Two days ago, with low gas (38 miles to empty), engine started running rough. Code read P0302, misfire cyl. 2. Since it had 113K miles, I figured its time to change...


Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Randy

Dec 02, 2010 | 2003 Ford Expedition

1 Answer

Is there a way to clean out the fuel injectors. my car hesitates on start up and when pressing gas pedal


using injector cleaner is your best bet. I recomend lucas or seafoam injector cleaner. You might want to replace your fuel filter first if you have not already done so. Hope this helps.

Apr 27, 2010 | 1997 Cadillac DeVille

2 Answers

1995 Cad. Deville. Engine light on, runs rough especially on idle. I was told that maybe the emc monitor may be problem? DDT


When was last time you replaced, fuel filter, plugs and wires, and had the injectors cleaned.

Sep 08, 2009 | 1995 Cadillac DeVille

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