this thing has had this problem for a while, has been sitting for two years. I thought it was a transmission solenoid, because its throwing code 621 only. but it seems to run rough and stall even in park, and is short on <NOBR id=itxt_nobr_0_0 style="FONT-WEIGHT: normal; FONT-SIZE: 100%; COLOR: darkgreen">power</NOBR> in drive and reverse. put fresh gas in it and started right up, ran like a top, then chugged and stalled in park, put more gas in it, ran good then chugged and stalled in park. it has newer plugs and wires, could this be an o2 sensor?

 

Not likely, the motor doesn't even look at the O2 until the engine is at operating temp. Pull the codes and check fuel pressure.

 

the only code i get is 621, which is the trans solenoid #1. its an e4od tranny. where do i get a fuel pressure gauge?

 

Some parts store will rent or loan them, have a look around.

 

I was looking at it again a little bit ago, it seems to have white steam coming out of the exhaust, i think it smells like coolant but it could be just rich exhaust. Does the egr cause rough running and steam like this if its bad?

 

No the EGR won't cause that kind of problem, if it's cold outside there will be a lot of visible water vapor in the exhaust until everything is really hot. If there are no sensors codes present you can pretty much eliminate all the EFI stuff as the source of your problem, it comes down to fuel and spark after that, hence the suggestion to check the fuel pressure.

 

Thanks, I ll try to look on the internet and find a fuel pressure gauge, probally cheaper that way. I ll let you know if I find out anything else today.

 

ok, even tho I dont have a way to test fuel pressure yet, I decided to go out there and do it the old fashioned way by poking the fuel test port with a screw driver. the fuel gushes out fast. I found there is a lot of air in the fuel rail. every time I bleed the air out, it starts back up. runs for a minute or so and then stalls again. I have to keep adding a 1/2 gallon of gas every so often or it wont start at all regardless of how much I bleed it out. this is in the rear tank because the front fuel pump dosent work anymore. it seems like the fuel pump is sucking up air. there is probably 3 or 4 gallons in the tank because Ive added about 5 gallons this weekend already and its only ran about 20 minutes total.