97 K3500 7.4l spitting, sputtering, backfires, and stalls

[454cid]

It acted the same spitting sputtering and stalling

That must mean something else is throwing off the info coming from the MAF, then.

What does the voltage look like on the front O2 sensors? What's the MAP sensor doing? I've never had to deal with the MAP sensor, so I'm not sure how it would affect the engine running. O2s can casue misfireing, although your fuel trims don't look horrible.

 

[1998_K1500_Sub]

It acted the same spitting sputtering and stalling

Confirm: You unplugged the MAF and then drove it while the MAF remained unplugged. Y/N?

That was @454cid's intention.

 

[Agibson]

O2B1S2 .170
O2B2S1 .155 to .120
O2B2S2 .095

 

[Agibson]

Confirm: You unplugged the MAF and then drove it while the MAF remained unplugged. Y/N?

That was @454cid's intention.

Wouldn't even run long enough to get out of driveway

 

[454cid]

Wouldn't even run long enough to get out of driveway

Did you just try it once, or did you restart it?

 

[454cid]

O2B1S2 .170
O2B2S1 .155 to .120
O2B2S2 .095

Sensor 1 on both banks, sensor 2 doesn't change fueiing.

.155 to .120 is pretty low. Was it steady, or did it go higher and then come back down and repeat? These readings would indicate a lean condition, which kinda makes sense given that your MAF was reading low.

 

[Agibson]

O2B2S1 is between 165 to 700

 

[Agibson]

Did you just try it once, or did you restart it?

I try to restarted bearly could keep it running. Let it cool down for an hour or so started ran rough than would run fine. Unplug it again ran good than would shut off that happen a couple of times

 

[454cid]

O2B2S1 is between 165 to 700

Assuming .165 and .700 that's low, but that's the same sensor you posited before. What bout bank 1, sensor 1?

 

[Agibson]

About the same as before