96 Gmc 1500 Help!!!

[LPC]

96 GMC 1500 - STARTS BUT WON'T STAY RUNNING
parts replaced: ac delco fuel pump, fuel regulator, distributor cap, rotor button, wires & plugs, temp. sending unit.
starts, runs for 5-10 seconds, can't accelorate, and dies. try again-does samething over & over.
fuel pressure reading between 55-65 at all times
WHAT THE HELL IS THE PROBLEM?????
ANY IDEAS????

[MrBillPro]

What about fuel filter?

[LPC]

Fuel Filter Has Been Replaced 2 Times During This Problem. If U Can Think Of Anything Eles Please Let Me Know Thanks

[flair666369]

not to insult you, but did you check for any OBD codes? or check the vaccuum system?

[LPC]

Not Insulted At All.thanks For The Help.
Scan For Codes With Obd1.
Passed No Codes. I Have Tryed This 3 Or 4 Times, On Codes. Checked All Over No Vac. Leaks. Replaced Crank Post. Sensor Also No Luck Still Having Same Problem

[shell1990]

Whats the mileage, it could be the fuel injectors

[70camaro]

Is '96 OBD 1, or OBD 2? My 97 is OBD 2, maybe you got the wrong scanner?

[flair666369]

they started OBD II mid 95 i beleive, so it should be OBD II, a chiltons/haynes manual should say for sure. Remember the three basics for "fire" is fuel/air/spark(ignition). Compression is a key role too for engines. Unfortunately sensors or as i like to call them, "pain in the *ss sh*t that gets in the way", have just as big of an effect, but rule out the four basics first.

[flair666369]

I'm an idiot, there is a haynes manual sitting right next to me, let's take a look see, shall we?......

TROUBLESHOOTING

Engine starts but stops immediatley......

1-Loose or damaged wire harness connections at distributor, coil or alternator.

2-Intake manifold vacuum leaks. Make sure all mounting bolts/nuts are tight and all vacuum hoses connected to the manifold are attached properly and in good condition.

3-Insufficient fuel flow.

(again, spark/air/fuel)

FUEL PRESSURE

V6 and small block V8 engines ..... 60 to 66 psi
7.4 V8 engines ......................... 56 to 62 psi

FUEL INJECTOR RESISTANCE

Central SFI systems (V6/V8) ...... 1.37 to 1.36 ohms
MPFI systems (7.4L V8) ............. 11.4 to 12.6 ohms

Did you check to see if fuel was actually coming out of the injectors?

If you have any other questions that I can look up in my book, give me vehicle specifics and ask, and i'll see what I can do.

Note: I've read elsewhere on this site (I forget where or for which application of truck) that the aftermarket fuel pump had insufficient power/pressure. OEM pump from the dealer worked, this might be the case, but from the sounds of it probably not.

[LPC]

Originally Posted by flair666369

I'm an idiot, there is a haynes manual sitting right next to me, let's take a look see, shall we?......

TROUBLESHOOTING

Engine starts but stops immediatley......

1-Loose or damaged wire harness connections at distributor, coil or alternator.

2-Intake manifold vacuum leaks. Make sure all mounting bolts/nuts are tight and all vacuum hoses connected to the manifold are attached properly and in good condition.

3-Insufficient fuel flow.

(again, spark/air/fuel)

FUEL PRESSURE

V6 and small block V8 engines ..... 60 to 66 psi
7.4 V8 engines ......................... 56 to 62 psi

FUEL INJECTOR RESISTANCE

Central SFI systems (V6/V8) ...... 1.37 to 1.36 ohms
MPFI systems (7.4L V8) ............. 11.4 to 12.6 ohms

Did you check to see if fuel was actually coming out of the injectors?

If you have any other questions that I can look up in my book, give me vehicle specifics and ask, and i'll see what I can do.

Note: I've read elsewhere on this site (I forget where or for which application of truck) that the aftermarket fuel pump had insufficient power/pressure. OEM pump from the dealer worked, this might be the case, but from the sounds of it probably not.

the fact that it runs tells me their is fuel coming out of the injectors

[CobraCDN]

Any idea what the Resistance should be on my TBI Injectors (1992 GMC 2500,4x4, 350) Thanks