Bypass o2 sensors

Nad_Yvalhosert said:

Strange. I reread your first post and it said nothing about being on a private road. Would've been nice to know...

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So I just looked around in Pineville, WV 24874, USA since that's where the OP's location is listed... which btw is only about 3.2 miles at its widest point..

Presume a 0-60 time of... pff let's be generous since she's a Vortec and say 8 seconds.. assume the vehicle weighs in the ballpark of 2800kg.. insert math here

Using that we can come to a rough estimate of 30 seconds for a 0-120, which would a whopping 804 meters of roadway. Let's toss on another 196 meters of stopping distance just to come up with an even 1 mile for simplicity. So now.. at least a 1 mile stretch of privately owned roadway in the OP's listed postal area, that's straight enough to actually achieve all this..

Admittedly it's kinda hard to see all the roads, but I'm pretty sure this happened on the 97 going East out of town.

Why meters when we’re talking MPH?

Ztoxic_Helix said:

it doesn’t have no codes except what was already there

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So what codes "was already there"?

I really think the OP ought to pull the codes from the ECU and then report the findings.

Given the symptoms I would expect the CEL should be glowing brightly.

There's not much point in speculating about the problem, given the limited amount of information provided.

Jesse_Wenting said:

at least a 1 mile stretch of privately owned roadway

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Q) How many private roads would be drivable at 120MPH?

A) ?

Caman96 said:

Why meters when we’re talking MPH?

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It makes for "familiar math", since many technical types are handier with the MKS system of units (meter - kilogram - second) than they are the Imperial system (feet - slug - second) or the FFF system (furlong – firkin – fortnight)... at least for "back-of-the-napkin" quick math.

Wouldnt a tps or iac surge or idle funny if not adjusted right or malfunctioning?

Ztoxic_Helix said:

I got a 1998 GMC Sierra 1500 5.7 vortex, 4l60e true duals exhaust, but I can’t figure out how to do the o2 sensors, I would much rather bypass them if possible, cause it says there supposed to have 4 o2 sensors, but I can only find the ones for the 2 at the top, my motor just revs up and down at 30, but past 30 runs great till I drop back down to 30 again, and it spits and spudders when I go from dead stop to up hill, but I know there nothing wrong with Tranny, got it up to 120 last night no problem, got mad at and wanted to blow it, done bought 3 transmissions for it

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You can find almost everything you need to know, here:

1998 GM Service Manuals - Four volume set

GMT400 CK Service Manual Project

Download these and give them some study.

Also wasnt 98 factory with dual exhaust assuming the front of the exhaust is untouched?

SUBURBAN5 said:

Also wasnt 98 factory with dual exhaust assuming the front of the exhaust is untouched?

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I know my 97, had OE dual exhaust up to the muffler. The OE muffler was a 2 in, 1 out muffler. Then it went over the rear end, and I think it turned down just after the spair tire.

Ztoxic_Helix said:

I just can’t figure out why it won’t drive normal or go up hill good, if I go from dead stop to up hill it acts like a map sensor is bad, but at 30 mph the motor just revs up and down for a few seconds, but only after you drop from a higher speed

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Is the transmission slipping at 30 mph? Why would it "revs up and down for a few seconds" if you're (theoretically) still accelerating to 120mph on your private road?