Iac Sensor 02 Sensor Rich

[sattresyclone]

any clue to why my iac position goes to zero. and also i unhooked boost sensor and ran vac hose from turbo straight to the accuator and still i get 14-15 lbs boost convertor is gutted i checked it. i tried to adjust the throttle screw up and down and turn off truck then turn back on and iac still stays at zero if i give it throttle it goes up to 4 or 6 but cant maintain 30-40 on the iac position. i changed tps sensor to. i dm the truck and dtc error shows iac error and o2 rich error replaced both already no change. any suggestions this is getting very old and expensive

 

[motorhead]

Re: Iac Sensor 02 Sensor Rich

IAC counts at 0 indicate a vacuum leak usually or some other reason why the ecm is trying to lower engine rpm. The ecm is fully extending the Iac pintle in hopes of blocking off the bypass passage. When it comes up when you bump the throttle is normal,its trying to prevent stall when the throttle eventually snaps closed. Whats integrater and block learn look like? numbers on block learn above 128 indicate lean exhaust.

 

[sattresyclone]

Re: Iac Sensor 02 Sensor Rich

not sure what integrater and block learn are? ill check for vac leaks already replaced vac lines. thanks