Hunting idle

wildphil

wildphil

I Love My Ty's
The last couple of days my truck has been acting like it is searching for idle. Only after it has reached operating temp.and when it park or neutral. In gear it is fine. When I drove to get gas two days ago the check engine light cane on. The codes were 42,43, and 42. I cleared then and they did not come back. Also I have been trying to do some tuning but autotune keeps adjusting table 29x up and back down. When I try the bin the truck runs lean. I even tried using a older bin that was close before. But the truck still runs lean.
 
wildphil

wildphil

I Love My Ty's
Re: Hunting idle

The voltage is 13.5

I did try the IAC reset

On vacuum leaks. I used the bicycle tube test months ago. At the time I had a leak at the tb shaft. The tube lost all the air in maybe 2 seconds. The idle has been fine until now. I could have developed an additional vacuum leak though
 
Jimmy

Jimmy

Banned
Re: Hunting idle

Make sure that the big vac port on the TB (next to the IAC) is sealed off.A leak there will cause hunting.
 
wildphil

wildphil

I Love My Ty's
Re: Hunting idle

Jimmy, would it be the port right next to the TPS? There is a port plugged at that location.
 
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