Question about 2004 Cadillac Deville

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I have a 04 cadilllac dts,the check engine light is on and it idles rough and i smell oil burning after it runs awhile. i replaced the mass airflow sensor. the code read random misfire. whats goin on?

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  • Expert
  • 271 Answers

There could be many problems with car, or no problems at all. A check engine light sometimes comes on just because there is a wire shortage. Other times there could be a problem. It is best to take it to a mechanic to do further diagnostic tests.


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Posted on Dec 12, 2012

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  • 1,207 Answers

First, try to get a obd2 code scanner to erase the code.

Posted on Dec 12, 2012

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Posted on Jan 02, 2017

m036_094
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SOURCE: car stalls, oil light comes on, smoke from under hood

sound like the overheating of the engine did some internal damage. ethier an intake or head gasket or maybe even a warped or cracked head. worse case senero would be a cracked block. check the oil see if it looks milky like a grey sludge. most likely it is a head gasket. have a leak down test preformed to confirm. the labor for the head gaskets is 9 hours for 1 or 11.5 for 2. I would replace both and have the mechanic check the heads and block for cracks while he has it apart.

Posted on Jan 04, 2009

  • 1 Answer

SOURCE: P0340 CODE COMES UP,SENSOR REPLACED

i have 2000 cadillac deville runs really good it has a po340 engine code runs good b when i come to a complete stop the engine idles up and down only at a complete stop what do i need to do

Posted on Oct 28, 2009

  • 1 Answer

SOURCE: Oil disappearing with no visible leaks and engine not using oil.

Check out this thread and take your Caddy for a couple of Wide Open Throttle runs on the Interstate. Clears out the carbon buildup on the rings that is causing oil blowby.

http://townhall-talk.edmunds.com/direct/view/.f1078f6/0

Posted on Jan 02, 2010

  • 752 Answers

SOURCE: rough idle. rpms drop. misfire.

try your coil packs they go over your sparks or do plugs first and see what happens do affordable first

Posted on Feb 01, 2010

  • 1 Answer

SOURCE: 95 cadillac eldorado engine stalls rough idle check engine light is on

I have a 95 eldorado that is starting hard and idling rough. Also noticed gas pedal fluctuating. I have been told it is the Fuel Pressure Regulator. Does that sound reasonable?

Posted on Jul 09, 2010

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1 Answer

I have 1995 chevy lumina with the3100 engine. It starts fine but idle is rough and has loss of power and smells like unburnt gas.


How long since overall tune-up? Any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum, something of that nature. Does it run ok off-idle?

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Hi, is your air filter clean,any trouble codes,throttle body clean,idle air control passage clear,idle air control module.

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Check engine light is on and the car runs rough at idle only. There is also a burning smell when I exit the car coming from under the hood. What could be the issues?


have a parts store pull code, to see what sensors r at fault, tps throttle position sensor may need adjust, oxygen sensor needs replaced, may have two ? both need replaced. gas cap might b faulty ? in any event, the trouble code must b cleared out from computer, after repaired is made. if engine light comes back on, reclear it. sometimes intermittant sensor problems occur, engine light comes back on. well, the gas we buy with ethanol is killing our engines, put some fuel stabilizer in @ next fuel up. but try some fuel injector cleaner first, winter gums up injectors, soooo ! fuel filter replacement is always in need, people don\'t get it, replace all filters, air, fuel, oil, get it ? maintenance is a necessary evil. u change yur clothes ever day, right ? well, same thing., good luck, ken

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Check the mass airflow sensor. Possible dirt build up.
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check the egr valve, it may need to be replaced.

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Runs rough,smells like not burning all the fuel/misfire


have vehicle scanned for the trouble code some thing is going and the code will give u ur starting point most auto stores will scan for free such as auto zone / advanced auto --if it smells like rotten eggs or like sulfur most likely catalytic converter going

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Why is my grand 2004 grand cherochee idoling rough


The idle air control valve (IAC) may be stuck or failing. This solenoid-type device controls the airflow into the engine at idle. It is fed control input signals from the engine's computer. Over time, the IAC valve may become dirty from EGR gases and carbon, etc. It may have a worn pintle (valve head) or the return spring may be weak or broken, causing a rough idle or even stalling from an over-rich fuel/air mixture. The second thing to have checked is the throttle position sensor.TPS. These devices will "flag" a fault on your vehicle's onboard OBD-II computer, which a decent code reader/scanner can display and clear. Third, a dirty throttle body housing/venturi can cause rough idling and poor response. A special cleaner is needed to remove oil and carbon residues from the specially-coated inner surfaces of the throttle body. Fourth; you may have a Mass Airflow Sensor (MAF) that might be failing/malfunctioning. Some vehicles use these instead of the Manifold Absolute Pressure (MAP) Sensor, which you may have. These sensors need to be checked and verified that they are functioning properly. Fifth; check/change your vehicle's fuel filter, and verify proper/adequate fuel pump pressure and flow performance. Don't run your vehicle below 1/4 tank of fuel...doing this sharply reduces the life and cooling of the in-tank electric fuel pump. These are not cheap, or easy to replace!

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1999 Buick Regal GSX won't stay running......


It's probably the mass airflow sensor and/or oxygen sensors.

Jun 18, 2009 | 1999 Buick Regal

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