2001 vw eurovan 145,00 milesI do son work on my family cars the problem is that start and die the obd codes po300 po340,po301,po304,po306 I test coil and spark plug wires are one all good change the spark plugs because have wrong plugs then I change intake monifold gasket was a little oil leak check fuel injector resistance all like perfect I clean then a replace the o-rings 3 on each one I put everything back then I have the same problem as before one time start running and was perfect this happend some times but after you turn it off and start again start and die I found that the secondary air injection pump wong go on pump is ok I test it out this is what I working on now I have a hart time finding the air pump relay using alldatadiy book show a #53 location 15 but there is 4 relay with the same number anyway I test the secondary air solenoid is good I took out the conbination-valve or combi-valve and is ok a little dirt but works that is expense like $250 I trying to see the air pump work all this system works with the computer I don't know how this system have to do with start and die I know iit work must on cold start If I press the gas about 2000 rpm will keep running and then you let the gas go slow and keep running but maybe in 4 cylinder a bad mis I keep it a few time gets normal hot like 185-190 and some times run like new car when is running good you can try a/c electrict fans all work the way should be. any idea about this I will apreciated
I've had start & die problems with two EVs (2001 &2002) that were caused by the ignition switch (electrical portion). The die issue occurred first, with no other symptoms. After a year or so other issues started (headlights going dark while driving, etc) and changing the switch cured all on both vans.
Cheap part, easy to change, and a common trouble spot.
Thank you for reply I may forgot to mention that the first obd code was po340 is about the cam sensor I change it and the code is coming back on the pending side with others like po300,po301,po303,po304,po306 po340 sometimes one time while running bad like in 4 cylinders using the scanner I erase the pending codes and start working perfect when is like that you can turn ac on and works very well if turn if off will start again but with the same problem bad idle and dies,in this car there are two cam sensor is like number 1 and number 2 I change number 1 that is the code po340
I plan tomorow 9-30 to test fuel-pressure and possible air filter change today I add about 5 gallons off gas and a sea fom can it may have water on the gas tank gas is very low I doing this for a freind
after I get it running ok I have to work on the secondary air system is not working the pump,solenoid,combination-valve or combi-valve all are good but possible a relay bad or wires problem.