HELP!!!

[Mudsport96]

Just thinking now about your video. You have something bizarre going on ( not just the noise), because just plugging and unplugging the open idle port that way should induce a pretty good stumble if not stall the engine since the iac isnt there to regulate the idle. What is the idle rpm with the iac and what does it go to without the iac.
Do you have a way to see your fuel trims?

 

[NBSTAHOE]

Just thinking now about your video. You have something bizarre going on ( not just the noise), because just plugging and unplugging the open idle port that way should induce a pretty good stumble if not stall the engine since the iac isnt there to regulate the idle. What is the idle rpm with the iac and what does it go to without the iac.
Do you have a way to see your fuel trims?

No. I’m doing this in my yard. The idle without the IAC is about 600-800 with the IAC, it wil surge to about 1000-1500 then calm back down and the noise disappears. I think the reason it didn’t stumble was because of the position of the throttle blade, like it got just enough air to continue to run.

 

[Rocket Man]

No. I’m doing this in my yard. The idle without the IAC is about 600-800 with the IAC, it wil surge to about 1000-1500 then calm back down and the noise disappears. I think the reason it didn’t stumble was because of the position of the throttle blade, like it got just enough air to continue to run.

I don’t suppose you have a stock TB you could swap on and see if the Holley is the issue?

 

[NBSTAHOE]

I don’t suppose you have a stock TB you could swap on and see if the Holley is the issue?

No spare TB. I’m pretty sure it’s the Holley. It made this noise the day I put it on. New IAC and TPS. Still does it.

 

[Mudsport96]

No spare TB. I’m pretty sure it’s the Holley. It made this noise the day I put it on. New IAC and TPS. Still does it.

Man, i hate to say it but i would hit the junkyard and look for a factory TB to put on it.
From the stuff ive seen, the TBSS intake doesnt add much with the 706 heads and lm7/l59 cam. So the smaller TB isnt really a restriction for you.
It works on the later 5.3s but i think that is partly the higher compression and i think the LY5 has a bigger cam... not 100 percent on that though

 

[NBSTAHOE]

Well I just tested the TPS with a multimeter, and I’m not getting increased voltage with moving of the TB blade. I get voltage and ground, it’s just not increasing in voltage. Rescanned for codes and got a 0122. So I’m going to get another TPS and see if that’s fixes it.

 

[Mudsport96]

Good place to start