Questionhi roland this car has 2.5 v6 it will run for a short time then die and has no spark checked for codes and there are none replaced crank sensor distributor and tried a pcm with no help,is it possible a failing fuel pump could cause a no spark condition? i tried swapping the asd relay with another one in the area same part # and no joy. any help would be appreciated.
AnswerHi Steve,
That is always frustrating when there are no codes. Are you sure that the spark dies before the engine rpm begins to drop or does it disappear when the engine comes to rest?
It should keep sparking until the engine comes to rest if the ignition system is o.k. You could be loosing fuel supply pressure. Or the ASD may be cutting out the spark, the fuel pump. and the injectors simultaneously.
If it is cutting out after several seconds of what seems like nurmal idling then I wonder whether you might be dealing with an anti-theft system which is alarmed. That is how they prevent theft by starting but then quickly dying.
Do you have an anti-theft system on the car and is there any visual indication from the dash light for that system that it might be in the alarm mode? The alarm can be cancelled by locking then unlocking either front door.
The asd provides power to the fuel pump, coil, and injectors simultaneously so they should not cause the ASD to shut down unless, as you tried, the crank or cam sensor signal stop being sent to the PCM.
If it is starting then stumbling and dying without true loss of spark, then I would check the egr valve to see if it might be stuck ajar. Lubricate the valve stem and test its motion by inserting the tip of a screwdriver in the slot of the stem and move it in and out to be sure it closes firmly.
So, reflect on those possibilities and see what you can find. Write me back. If I'm maxed out, use the "thank and rate tab" where there is an opportunity to "comment". I get an alert that you have sent me a message and will then respond. If I stay available all day, it becomes overwhelming.
Roland
