TBI 350 Target Idle Speed

[ralmo94]

That's why I suggested unplugging the TPS, to see if it wants to command a lower idle speed with TPs disconnected. If it doesn't, I doubt a new TPS will do any good

[MO LS Noobie]

To be clear, you don't need to remove the IAC, just plug the hole from the top of the throttlebody.

[ralmo94]

To be clear, you don't need to remove the IAC, just plug the hole from the top of the throttlebody.

With all due respect, as the op was trying to point out, a hanging or malfunction iac wouldn't cause the ECU to command 1k idle rpm, if you cut off iac circuit air, you are still going to be the same requested idle speed, it just won't be able to attain it, unless I am missing something.

[MO LS Noobie]

With all due respect, as the op was trying to point out, a hanging or malfunction iac wouldn't cause the ECU to command 1k idle rpm, if you cut off iac circuit air, you are still going to be the same requested idle speed, it just won't be able to attain it, unless I am missing something.

Agreed, he has been chasing this issue for a while.

[maronielb]

Yes i have and I’m about to burn this truck if i don’t figure it out, i just spent 20k restoring this truck from the frame up and i can’t figure out a damn idle issue

[maronielb]

I will do this tommorow and get back to you, last time i unplugged it the idle went higher