Throttle Sensors vs Wire Round 7 - SOLVED

[Joseph Garcia]

@Joseph Garcia
No I didn't. This is one of those times you can look back on and say, "That's how I learned that."
So thanks!

How many of these things am I looking for?

In the engine bay, you'll have to look around for the grounds, but they are obvious. There is also a major ground point on the frame under the driver's footwell/seat, underneath the truck.

 

[OBSandaNNBS]

Thanks. I tried testing them but getting to the radiator support ground and the one you mentioned is rather difficult. Unless I'm not seeing it.
I love this truck but it ain't loving me back...

 

[Fless]

Underneath the truck there is a body mount just forward of the driver's door. There are grounds on that body mount.

 

[OBSandaNNBS]

Underneath the truck there is a body mount just forward of the driver's door. There are grounds on that body mount.

View attachment 444850

Ah that's pure gold! I was just missing it apparently.
At the risk of sounding dumb, how do I get the "collection" of schematics?

 

[Fless]

Ah that's pure gold! I was just missing it apparently.
At the risk of sounding dumb, how do I get the "collection" of schematics?

I don't recall where I got that. Maybe someone else can show a resource.

 

[mikez71]

Light Duty Prior To 2013 - GM Upfitter

www.gmupfitter.com

You may need to look in the truck section. The latest complete diagram is the '08 electrical diagrams.
Later diagrams are updates and additional connector pinouts.

Also can use this site for alternate diagrams... www.charm.li

 

[OBSandaNNBS]

@mikez71
@Fless
@Joseph Garcia
@89Suburban

Thank you guys for helping me out!!
That link is awesome MikeZ71! Knowledge is power...

I went for "easy" and put the new ACdelco throttle body in...same issue. Which is still "rev bump" when downshifting 2-1 and on stop with tranny clunk/hard shift.
I reexamined the wiring in engine bay, no obvious problems.
I educated myself on back probing...but I'm going to get at the other grounds I wasn't able to access the other day first.

Finally, maybe here is a key...I was rolling down a hill to a red light yesterday and shifted to neutral to avoid the hard shifts.

What I got instead was 2500 rpm that would not go away when I shifted back to drive and then park.

I turned the truck off and thankfully my prayers were answered when it restarted with a normal idle. ?!?

I called a week ago but the dealership couldn't get me in till Tuesday/Thursday. I basically decided to go that route instead of getting a proper scan tool...for now.

Any thoughts you guys gots are helpful.

All I want for Christmas is this Tahoe to run...

Thanks again.

 

[mikez71]

Dangit, sorry to hear the trouble persists.
Since you replaced the throttle body, the only guess I have left, is the pedal itself.
Hopefully the dealer can diagnose and fix it soon. Please keep us posted!

 

[OBSandaNNBS]

Thanks everyone again. I ended up taking it to the dealer. Only the second time I've ever taken a vehicle to a mechanic. (Too poor, stubborn, or proud)

Survey says...

They aren't sure either. Probably a wire problem/electrical issue. They are still looking at it........

On the plus side, this exonerates me from not being able to fix it

 

[OBSandaNNBS]

Okay gents, thanks again for the help!

The official version is...
Not sure! The dealership fixed wiring, and installed ANOTHER pedal. If I had to guess, there was a break in the wire near the connector, which apparently was fixed incorrectly by my old man and I. We triple checked those wires and soldered though! They said it fried my new pedal, but I'm more inclined to say I received a defective one...

She runs better than before...so no complaints I guess.