What's the fuel pump pressure?
Was it really only 6-months it sat or could it have been longer, making the gas closer to a year old?

 

Gas could be a year old. But customer treated the fuel woth Sta-bil fuel stabilizer. Not sure if that makes a difference.

 

Fuel pump was replaced 1 year ago when he was having related issues by another mechanic. OEM parts were used-not aftermarket.

 

Fuel stabilizer doesn't always work.... Year old gas is going to be nasty, regardless of what he put in it..... How much gas does it have? Have you added any more? Burned thru much?

 

Put in 10 gallons yesterday. It had a quarter tank before that. I had suspected bad gas yesterday and put the 10 gallons in after resetting the PCM and test driving it. Am getting ready to test drive it again right now after unplugging the front O2 sensor.

 

Disconnected the front O2 sensor as you suggested. Drove van for 1 hour in stop and go. Stalling has stopped
Should i replace the sensor or does this indicate another problem.
Thanks very much.

 

Replace the sensor. NTK, or Denso sensors ONLY please. Skip Bosch, these engines don't like 'em.

 

how would the o2 sensor make the van stall,does it make the van run too rich,and then just shut off, Ive not heard of this before,,,,

 

O2 sensor measures oxygen in the exhaust stream. If it becomes inaccurate, the PCM starts basing injector pulse on bad information, and you get odd problems. Removing the O2 sensor from the equation, and the stalling stops, indicates that the O2 sensor has indeed failed, the PCM just can't figure that out. O2's have MANY failure modes that WON'T set a code. Without it, the PCM tends to run the engine a bit on the rich side, so, you get rough idle as well. There may also be other issues contributing to the problem..... When's the last time the engine had a tune up? How are the cap and rotor? Plug wires? Are they routed per the TSB?? (a good set of plug wires will alleviate some of the issues the TSB addresses, it was all about cross-talk on the wires, and firing the wrong cylinder at the wrong time.....)

Replace the sensor, reset the PCM so it forgets everything it learned with the bad O2 sensor, and let it relearn. If everything else is up to snuff, it *should* take care of the problem.

 

I never knew that , thank you very much for that reply, I’m always learning something new here,,,,thanks,,,