I have a problem that no one can seem to figure out!!

[Steve Wood]

Never been pissed off at you!  sometimes you gotta forget science and try anything you got!

[we4turbobuick]

It is possible but not very probable.

You can check the o2 sensor voltage with a meter and see if it is showing that under the hood.

If it is not, then I would look at my grounds on the back of the head to be sure all are snugged down with no wires loose in the crimp on connectors and no wires broken off.

Otherwise, it would seem to be a fuel pressure problem.  Did you ever turn the fuel pressure up to 50 or more to see if the symptoms changed?

I turned the the fp up to 50 psi the car idled fine the o2's were in the 700-800`s but when you drive it still sputters.

[we4turbobuick]

can a ecm be bad or have issues without it throwing a code? I know that with the turbo tweak chip my o2's should be in the 700-800's. it keep falling below 100 or be stuck on 000. Are there any other parts or sensors can be bad that can cause this the only one that I can think of is the ecm ..... but im just guessing.

Steve's gonna get pissed at me again...but have you got a spare ECM you could try?

Cool do you live in denver, co?

[Steve Wood]

so it sounds like it is not getting fuel...I would guess that your fuel gauge is wrong and if it is a rail mount, I am not surprised.

But since it sputters when you drive it, I am thinking there is a delivery problem as well which may be the pump dying, or an obstruction in the fuel line, or filter.  Now, we need a fuel guage on a hose so you can set it on the windshield and see if it falls when you drive (pressure falls)

Brad's one of those Canadians....

[Steve Wood]

What do the O2s do when it starts to sputter....it may well be something other than the fuel system

[we4turbobuick]

What do the O2s do when it starts to sputter....it may well be something other than the fuel system

When it starts to sputter the o2`s stay stuck on 000 or below 100

[Steve Wood]

so they say the car has run out of fuel.  Need to confirm that with a fuel pressure reading

[we4turbobuick]

is there a issue with the walbo pumps ? I just put one on two months ago .... can it be going out already ?

[Steve Wood]

Some think they are more problem prone than others and a couple of years ago, the one that started with F in the parts number was failing left and right.  Some say it was fixed, but, I am not so sure.  There are also a lot of counterfeit Walbros reportedly on the market...but I have seen other brands fail as well.  Saw a new DW pump fail recently.

Then, there are problems that occur because the hose in the tank that goes to the pump was not tightened enuf, or was overtightened and cracked the hose....and problems with the ground wire, etc. 

A fuel pressure test will tell the tale.

Given that the o2s stopped going to 000 at idle with an increase in pressure, I am guessing that was the gauge and the o2 sensor is working properly.  Given that they fall to 000 when driving and the car sputters, it seems to me that you have a fuel delivery problem.  I would guess a pump problem but it could be electrical, or the pump hose, etc.

I am like Ronald Reagan, I only trust when I can verify

[we4turbobuick]

can a bad injector O ring cause this ?
 

[Steve Wood]

not in anyway I can conceive

You will avoid a lot of grief with these cars by owning a decent fuel gauge....way too many have been blown up from lack of fuel.

As a quick check, you can pull the schraeder valve out of the end of the fuel rail, slipping a hose over the threads, stick the hose in a gallon container, touch the fuel pump test lead to the back of the alternator battery post and see if it pumps a gallon in one minute, or less.

That's not necessarily a good test for running under boost, but it should tell you that you have enough fuel to at least drive it around.   I would let it idle for a bit to warm the pump up a bit

[we4turbobuick]

what is a fuel pump test lead?

[Steve Wood]

It is one of the two connectors that come out of the wiring harness just below the alternator.  The fuel pump test connector is the one with a single wire.  the one with two wires is the tach test connector where you can connect a test tach

[we4turbobuick]

It is one of the two connectors that come out of the wiring harness just below the alternator.  The fuel pump test connector is the one with a single wire.  the one with two wires is the tach test connector where you can connect a test tach

I think I see a problem ...... there is a wire already plugged in the fuel pump test connector its going to the fuel pump hot wire kit that the last owner installed ... so that's raising red flags to me right now !!!! should anything be plugged in the fuel pump test connector ?

[Steve Wood]

it goes hot when the key is turned on for a couple of seconds.  It makes a good trigger for a hot wire relay.  that is the way my cars are rigged.

If you put 12 volts to it, the fuel pump will run even with the key off.

As the car is hot wired, you need to leave it connected while applying voltage to it