long story short, i picked my car up .. drove it home..
car was practically on empty, i filled it up...
drove it 1 block, gave it some power... and it started sputtering and misfiring.

the car almost stalls but doesnt let itself stall.
on the highway it feels totally fine, on the street it feels like its running on 1 cylinder.

durametric is saying there is a misfire on every cyclinder, except one

we replaced the fuel, spark plugs, and the MAF... and still the same issue...

what do you guys think the problem could be ?

 

i have the portable UMW flasher device. How do i put this piece of **** in stock mode ?

 

i was going to say fuel , but you said you already replaced it, did you run it just to get the old fuel out of the lines ?

how about the coils ?

 

Tappet solenoid bracket?

 

Any chance you picked up some trash at the bottom of the gas tank and it got into your injectors?
Just a thought.
It happened to me on another vehicle and it did the same thing.....didn't idle worth a darn but would run almost normal on the highway.
Not sure if the same would hold true with a P-car.

 

i think they looked at the coils also
almo, what is a tappet solenoid bracket ?

 

nope, not the injectors. they looked into that as well

 

Just a thought... I have seen two cars with this issue... one threw a CEL at 3000 and instantly went away, other kept the CEL a bit... check out post #23 in the below thread.

https://www.6speedonline.com/forums/...e-light-2.html

 

Given that you are getting misfires on all cylinders, it is not a "cylinder specific" problem.

Think something that feeds all cyls...fuel pressure regulator, fuel filter... have yoy monitored fuel pressure? Usually a clogged in fueling (ie filter) will show itself at increasing throttle (when it is calling for more fuel). Classic is that it runs fine at idle and part throttle, then msifires and limp at WOT

All I got.

A

 

I also have the UMW OBD device. Stock is usually #1. Put it in the OBD, the green light goes on. Push down on the button until the red light begins to flash. Let it go, wait till the green light comes back on steady and the red light goes off. Turn off the ignition, and pull out the device. Remember, you can always call Kevin.

 

Hope you resolve your problems soon! Keep us updated tks!

 

Any codes?

 

???? fuel pressure regulator, too high pressure would give the same problems.

 

thanks guys.
the only codes the durametric is showing is misfires and seconday airpumps (on both banks), and MAF code.

gonna try more trouble shooting today.

 

Clean MAF or swap with another one (if available). Check the spark plugs and or coils. I'm sure you know about the upgraded ignition coils (997 part #)