Tonyrodz's Tahoe Build Thread

[Tonyrodz]

Hoping, that’s the word lol. I should have known but all I can do from here is hope Tony. I’m not much help since I can’t be there. I’d figure it out if we’re neighbors for sure but we’re about as far apart as possible.

Thx Mark, I appreciate that. This thing has been a real *****, I think ever since the 1st 6.0 went. Most days I just want to burn it or drive it over a cliff--like they did on Roadkill. But I can't afford to get rid of it --so I'm stuck with it--just like ******!

 

[Tonyrodz]

Does @Scottydoggs have a Tech2? Thinking you could try his so you’d know if the problem is the truck or the Tech2.

I don't think he does.

 

[Dantheman1540]

This thread is making my hair turn grey. It seems like everybody else has thought of just about everything. Its kind of hard to read back and collect all the symptoms and evidence is there any way you can make a detailed list of the symptoms and what has been checked. I know it's sorta redundant but sometimes one little thing is assumed and so everyone will skip it and that ends up being the simple solution.

 

[Scottydoggs]

Does @Scottydoggs have a Tech2? Thinking you could try his so you’d know if the problem is the truck or the Tech2.

i dont, just the hpt.

 

[Rocket Man]

Thx Mark, I appreciate that. This thing has been a real *****, I think ever since the 1st 6.0 went. Most days I just want to burn it or drive it over a cliff--like they did on Roadkill. But I can't afford to get rid of it --so I'm stuck with it--just like ******!

Ah **** now you got ******? Dude.

 

[Tonyrodz]

This thread is making my hair turn grey. It seems like everybody else has thought of just about everything. Its kind of hard to read back and collect all the symptoms and evidence is there any way you can make a detailed list of the symptoms and what has been checked. I know it's sorta redundant but sometimes one little thing is assumed and so everyone will skip it and that ends up being the simple solution.

Man! That makes perfect sense to do, but honestly I wouldn't even remember where to start.
This issue really started when the shop welded on a new O2 bung on the ps collector. I replaced that O2 because it was lazy-- @Scottydoggs plugged his hpt laptop into it for me and got the readings, saying the ps readings were lazy. I bought a new O2 but it wasn't really stating in because the threads were stripped in the old bung. While it was in--the new O2--it ran fantastic! Didn't sputter or pop and had plenty of power. The next day I drove it to the shop for the new bung--the ride there was fine, but the O2 finally had popped out.
Anyway the shop welded the new bung, and they must've had the new O2 in it when they did.

Which was the beginning of it running like shit. My gf drove it home, and I was in my work van, so I didn't know there was an issue until we talked. It sounded fine idling while in park. Taking it for a ride it popped and was breaking up.

There were never any codes, and we all thought it was the O2 that had gotten ruined.
I replaced the O2 today--but I just let it run for a few minutes, I didn't let it warm up. These are the numbers I got off the tech 2--

So the new O2 is in now but I haven't taken it for a ride since it was snowing all day. So @Dantheman1540 I might've skipped around a little bit, but this is where it stands as of now. Any ideas? Not sure if I mentioned it--no codes.

 

[Tonyrodz]

Not that it means much--this is the mileage as of today.

 

[sonic_the_hedgeh]

I believe the switch modules themselves get programmed not the BCM. That’s why they work when you pull them off the other truck. That’s the way stuff works on the NNBS platform. There’s a programming function in the Tech2 for the switch modules. But maybe there’s no programming in the NBS I’m not sure.

Did you check the grounds under the truck first? I had a problem with mine not working and found the grounds on the driver's side underneath by the frame rail were rusted. Cleaned those and they worked fine. Had to use my dremel tool to get it really clean.

Sent from my LM-V600 using Tapatalk

 

[Dantheman1540]

Not that it means much--this is the mileage as of today.View attachment 270181

Just wondering did you deactivate decel fuel cutoff? Not sure if that's something that can be messed with using a tech 2 or not but my understanding is it just helps MPG a tiny bit by not throwing fuel at a motor that's slowing down. totally unrelated to your problem tho (I think)

So if the truck ran great to the shop with the new O2 in the old bung then we know it's either totally an intermittent issue likely electrical or it has something to do with that O2 or its circuit.

I think @sonic_the_hedgeh idea is pretty valid I had some weird trailer light issues unit I pulled those grounds off and cleaned them then repainted over them. With your mileage and salt issues they could be really rotten.

Another possibility is a bad sensor out of the box but since it is reading I would doubt that. It's also strange that the truck isn't throwing any codes for the O2.

Is there any way you can reset the LTFT with the tech2? Maybe you had a failing O2 so long that it started to write a ton of LTFT corrections which are now affecting the truck.

Is there any way to scan for misfires with the tech 2? or for knock retard?

 

[Tonyrodz]

Just wondering did you deactivate decel fuel cutoff? Not sure if that's something that can be messed with using a tech 2 or not but my understanding is it just helps MPG a tiny bit by not throwing fuel at a motor that's slowing down. totally unrelated to your problem tho (I think)

So if the truck ran great to the shop with the new O2 in the old bung then we know it's either totally an intermittent issue likely electrical or it has something to do with that O2 or its circuit.

I think @sonic_the_hedgeh idea is pretty valid I had some weird trailer light issues unit I pulled those grounds off and cleaned them then repainted over them. With your mileage and salt issues they could be really rotten.

Another possibility is a bad sensor out of the box but since it is reading I would doubt that. It's also strange that the truck isn't throwing any codes for the O2.

Is there any way you can reset the LTFT with the tech2? Maybe you had a failing O2 so long that it started to write a ton of LTFT corrections which are now affecting the truck.

Is there any way to scan for misfires with the tech 2? or for knock retard?

I've cleaned those grounds already--they weren't that bad. Also when I had disconnected the old O2 I never got a code either, which I thought was strange. I'm not sure if I can reset ltft with the tech 2. Is that possible @swathdiver , @Doubeleive @Fless ?
Def isn't misfiring. This is at idle.

Thx for all the ideas @Dantheman1540, keep 'em coming if you can think of anything else.

 

[George B]

I noted that you didn’t let it warm up after changing that sensor. You should take it for a ride and get it up to temp. Then share a video of the live O2 data at idle. Not sure on the fuel trim reset. For all we know after what he had for plugs in it there could be a mix and match of injectors too. Wouldn’t be surprised but with a dead O2 the LTFT would be way out for a while until you drive it.

 

[Tonyrodz]

I noted that you didn’t let it warm up after changing that sensor. You should take it for a ride and get it up to temp. Then share a video of the live O2 data at idle. Not sure on the fuel trim reset. For all we know after what he had for plugs in it there could be a mix and match of injectors too. Wouldn’t be surprised but with a dead O2 the LTFT would be way out for a while until you drive it.

That makes total sense @George B. Hopefully I have flex fuel injectors in it--but I doubt it.

 

[Doubeleive]

I've cleaned those grounds already--they weren't that bad. Also when I had disconnected the old O2 I never got a code either, which I thought was strange. I'm not sure if I can reset ltft with the tech 2. Is that possible @swathdiver , @Doubeleive @Fless ?
Def isn't misfiring. This is at idle.

Thx for all the ideas @Dantheman1540, keep 'em coming if you can think of anything else.

yes you can reset the fuel trims it's pretty easy just browse the menu I forget where it is at under special options or something like that. It will say "reset fuel trims"
I would go back to the muffler shop and ask if they could check for a exhaust leak usually those guys are pretty good at finding leaks because they deal with it all the time.
if you have one of those drive in car wash with the pressure washing wand I would get under there and wash all the transmission fluid off.

 

[Dantheman1540]

I noted that you didn’t let it warm up after changing that sensor. You should take it for a ride and get it up to temp. Then share a video of the live O2 data at idle. Not sure on the fuel trim reset. For all we know after what he had for plugs in it there could be a mix and match of injectors too. Wouldn’t be surprised but with a dead O2 the LTFT would be way out for a while until you drive it.

That makes total sense @George B. Hopefully I have flex fuel injectors in it--but I doubt it.

That's a good thought about mismatched injectors but doesn't explain why it ran fine to the exhaust shop. I don't really know a way to visually identify the difference in the injectors especially while they are installed.

 

[Tonyrodz]

yes you can reset the fuel trims it's pretty easy just browse the menu I forget where it is at under special options or something like that. It will say "reset fuel trims"
I would go back to the muffler shop and ask if they could check for a exhaust leak usually those guys are pretty good at finding leaks because they deal with it all the time.
if you have one of those drive in car wash with the pressure washing wand I would get under there and wash all the transmission fluid off.

Out of the question with that exhaust shop. Do I need that Candi module? I don't think it works.

 

[Doubeleive]

Out of the question with that exhaust shop. Do I need that Candi module? I don't think it works.

you can go to any muffler shop and ask if they can check for a exhaust leak, just tell them you are hearing a popping sound.
I don't think you need the candi module for your year, why do you think it is not working?

 

[George B]

That's a good thought about mismatched injectors but doesn't explain why it ran fine to the exhaust shop. I don't really know a way to visually identify the difference in the injectors especially while they are installed.

I was thinking the truck was adjusting the trim to compensate for a potential mismatch of injectors. Can't tell until it gets some time to adjust with a working O2.

 

[Tonyrodz]

you can go to any muffler shop and ask if they can check for a exhaust leak, just tell them you are hearing a popping sound.
I don't think you need the candi module for your year, why do you think it is not working?

I've plugged it in multiple times and the light is red most of the time. I don't remember if it was blinking or not.

 

[Doubeleive]

I've plugged it in multiple times and the light is red most of the time. I don't remember if it was blinking or not.

When a technician is using a Tech 2 they are automatically notified for the need of the CANdi module by a message on the screen of the Tech 2. The CANdi module will be needed on 2005 & later GM vehicles & 2006 & later Isuzu commercial vehicles when two or more vehicle computers (ECM, TCM, BCM, ABS) are communicating. The CANdi module does not interfere with any diagnostic procedure currently performed by the Tech 2.

 

[89Suburban]