Question about 1996 Cadillac DeVille

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My car kills when at idle. has low r/min at idle.

I had my egr valves replaced and my fuel system flushed and engine decarb but it still seems to kill. when i start it up the 1000r/min goes down to between 1 and 0 and when im at idle it does it to. for a while it didnt kill but it kill on me again when i stopped. when i start it right back up and hurry and drive it it runs fine but then i stop and sounds like it is about to kill.

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  • Cadillac Master
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Check the Idle Air Ctrl (IAC) motor. It should allow air to bypass the throttle plate when starting and at idle. if it is not working it could cause veh. to stall.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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1995 chevy tahoe 4wd. 5.7 liter when cooled down, starting is normal . Right after, engine almost stalls but Idle air control kicks in and keeps it running. eventually it is idling but rouph. On...


If your vehicle has one, and I think it does, check your EGR system. If the egr valve is full of carbon, it can be partially open, creating a vacuum leak. If the egr valve solenoid is bad, it could be opening the valve at the wrong time, also creating a vacuum leak. Unplug the egr vacuum hose, plug the open end of the hose and start it and see what it does. A picture of the egr is below.
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Car would not start so replaced battery, then alternator; Ran great for roadtrip then shut down on the freeway. Can hear the fuel pump, so replaced the fuel filter; has spark. Has fuel. Wires are in good...


WHEN A CAR SHUT DOWN ON HIGHWAY OR FREEWAY.YOU CAN STILL HAVE FAULTY FUEL PUMP.IT COULD BE RUNNING BUT THE FUEL PRESSURE CAN BE TOO WEAK.THE 2.5 ENGINE FUEL PRESSURE IS 6.0 TO 7.0 PSI AND THE 3.3 ENGINE FUEL PRESSURE IS 37 TO 43 PSI. ANOTHER THING CHECK TO MAKE YOUR COOLANT IS NOT LOW.LOW COOLANT CAUSES ENGINE GET TOO HOT SHUT OFF.CHECK PVC VALVE AND EGR VALVE MAKE SURE THEY ARE NOT STUCK OPEN OR DISCONNECTED.AND MAKE SURE IDLE SPEED IS NOT TOO LOW YOU IDLE SPEED IS ON THE FACTORY STICKER UNDER THE HOOD.

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99 Daewoo Leganza DTC P0301


When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc.

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow.



P0301:

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

P0302:

Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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1 Answer

Egr low circut malfuntion


  1. Check the EGR control system and EGR valve with the engine fully warmed up and running [engine coolant temperature over 76 °C (170 °F) ]
  2. With the transaxle in neutral and the throttle closed, allow the engine to idle for 70 seconds .
  3. Abruptly accelerate the engine to approximately 2000 r/min , but not over 3000 r/min .
  4. The EGR valve stem should move when accelerating the engine. Repeat the test several times to confirm movement.
  5. If the EGR valve stem moves, the control system is operating normally.
  6. Remove the vacuum hose from the EGR valve and plug the hose end.
  7. Connect a hand vacuum pump directly to the EGR valve
  8. Check whether the engine stalls or if the idle is unstable when a vacuum of 20 kPa (6 in.Hg) or higher is applied while idling.
this is the test procedure but I would suspect the EGR TRANSDUCER SOLENOID

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HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.


Try replacing the ignition control module it is located under the distributor cap Cost is around $30.

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