Tonyrodz's Tahoe Build Thread

[Tonyrodz]

you you ever look into whether or not this new engine had the same injectors? if they are different you could be running lean and its KR you feel pulling timing making it feel slow or weak.

knock sensors dont work till the engine is warmed up, so in theory if it feels stronger when it cold still shes got knock for some reason.

Today was the 1st day that I really floored it. I'm assuming the injectors on it are the same what was on there before.
I was maybe 2-3 miles from home when I noticed the weird exhaust sound. Then when I floored it, that killed the testing I was doing. While idling it sounds good, and driving slow it sounds fine. I'm friggin lost.

 

[Tonyrodz]

Didn't you get the right belt to match the upgraded alternator? The belt tensioner can take up only so much slack, but if the belt was too small, the tensioner would be too tight.

I had to go 1 or 2 larger in size. The old belt was too small. I guess I should ask for a belt for a 160 amp alt?

 

[Fless]

I had to go 1 or 2 larger in size. The old belt was too small. I guess I should ask for a belt for a 160 amp alt?

Like a belt for the 6.0 on a 2006 Esky?

RA has a few more listed for the 6.0 with that alternator.....

You could look up the specs on one of these for the size.

 

[Tonyrodz]

Like a belt for the 6.0 on a 2006 Esky?

View attachment 263394

View attachment 263395

RA has a few more listed for the 6.0 with that alternator.....

You could look up the specs on one of these for the size.

Thx. I'm gonna try this--soon. I gotta work on my van tomorrow, it's leaking trans fluid.
Car problems suck!!

 

[Fless]

Thx. I'm gonna try this--soon. I gotta work on my van tomorrow, it's leaking trans fluid.
So tired of car problems!!

Might see if you can read the number on your current belt.

 

[Tonyrodz]

Might see if you can read the number on your current belt.

I saved the sleeve it came in.

 

[Tonyrodz]

Called Brian Tooley tech line and asked about compatibility of this cam with the higher compression of the LQ9. He said everything will play nice together. I have a low octane tune so I asked about KR, timing while using 89 or 91 octane. He said since I have a low octane tune I'd be wasting money putting anything over 87 in it. I'd gain 0 benefit.

 

[Danny3737]

LOL. I saw “Poly Rib” and thought it was a ****** wrapper at first. Really need to wear my reading glasses more.

I saved the sleeve it came in.View attachment 263396

 

[Tonyrodz]

LOL. I saw “Poly Rib” and thought it was a ****** wrapper at first. Really need to wear my reading glasses more.

Lol, sux getting old.
Ribbed for her pleasure :****:

 

[Dantheman1540]

Here are my theories:

1) Its very possible its experiencing belt slip at the higher rpm causing the fuel pump to get low voltage and not pump enough. Fix belt problem see what happens.

2) Don't think it's due to injectors because if they were different the injector scaling would be way off and likely not idle right or have other issues other than just WOT. (Just a theory)

3) Check simple stuff like plugs and wires, just because they are new doesn't mean they are installed correct or even good.

4) Weird exhaust sound kinda makes me think timing is off but the other symptoms don't match that so I go back to improper fuel and/or spark.

 

[Tonyrodz]

4) Weird exhaust sound kinda makes me think timing is off but the other symptoms don't match that so I go back to improper fuel and/or spark.

Something with the tune you think? Gonna try to get another belt tomorrow. I googled for an 05 Silverado HD 2500 with 6.0 and 160 amp alt. Came up with this acdelco 6k930.

 

[Dantheman1540]

Something with the tune you think? Gonna try to get another belt tomorrow. I googled for an 05 Silverado HD 2500 with 6.0 and 160 amp alt. Came up with this acdelco 6k930.

I have no ideas on what belt I'm still running the one the Tahoe came with, and on my Silverado I have almost a dozen custom 8 rib belts I bought off another forum lol. But I have had belt slip at high rpm cause other issues so I'd get that dialed and it might fix the problem. Especially since you are close to maxing the injectors and pump already.

If that doesn't work look for all the usual little stuff then look at a tune. I just don't see 1.5 points of compression making that huge of a difference.

 

[Tonyrodz]

I have no ideas on what belt I'm still running the one the Tahoe came with, and on my Silverado I have almost a dozen custom 8 rib belts I bought off another forum lol. But I have had belt slip at high rpm cause other issues so I'd get that dialed and it might fix the problem. Especially since you are close to maxing the injectors and pump already.

If that doesn't work look for all the usual little stuff then look at a tune. I just don't see 1.5 points of compression making that huge of a difference.

Ok. Thx for the advice. I hope a proper belt will fix my problem, but...........

 

[Dantheman1540]

Ok. Thx for the advice. I hope a proper belt will fix my problem, but...........

Watch your voltage gauge as you get on it and see if it drops. Also do your pulleys have any black powder or residue around them? It's a tell tale sign of belt slip.

 

[Tonyrodz]

Watch your voltage gauge as you get on it and see if it drops. Also do your pulleys have any black powder or residue around them? It's a tell tale sign of belt slip.

I didn't notice any voltage drop, but I wasn't looking foe it either. I did see some residue today on the new pulley I installed.

 

[Dantheman1540]

I didn't notice any voltage drop, but I wasn't looking foe it either. I did see some residue today on the new pulley I installed.

Blowers cause belt slip and I had tons of issues when I ran a 6 rib belt. Can't say I ever had fuel pressure drop because of it but I also have a hotwire fuel pump and other upgrades so I wouldn't rule it out on your setup.

Also try to look in your mirrors when you do it. If its puffing black smoke then it's getting plenty of fuel and is likely a spark issue.

 

[Tonyrodz]

Blowers cause belt slip and I had tons of issues when I ran a 6 rib belt. Can't say I ever had fuel pressure drop because of it but I also have a hotwire fuel pump and other upgrades so I wouldn't rule it out on your setup.

Also try to look in your mirrors when you do it. If its puffing black smoke then it's getting plenty of fuel and is likely a spark issue.

Will do. At idle the exhaust looks normal--if that counts for anything.

 

[Dantheman1540]

Will do. At idle the exhaust looks normal--if that counts for anything.

It's part of the puzzle, at idle the injectors and spark system aren't under load so it's more likely to run right at idle than at WOT.

 

[Tonyrodz]

It's part of the puzzle, at idle the injectors and spark system aren't under load so it's more likely to run right at idle than at WOT.

Makes sense...

 

[Rocket Man]

I’m feeling your pain, Tony. I wish you had a BB tune, Justin would help you figure this out. Sorry for your troubles but I’m no help I’m afraid.