Hey Guys I Need Help Quick

[Nick88]

any one know if a faulty iac would cause lack of power driving around, or could it only affect idle?

 

[Nick88]

Could it also be because I didn’t “reset” the iac when I installed a new one, and if so how should I go about doing so, (preferably without screwing around with the base idle screw)

 

[Jroctizzle]

Grab the side of the throttle plate (where the cables connect) and try moving it back and forth, if it moves that’s an issue, happened to mine.

Also you can plug the IAC port on the back left side of the throttle body to check for vacuum leaks, truck shouldn’t run or start if there’s no vacuum leaks.

 

[Jroctizzle]

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This is the relearn procedure for the iac, snagged it from another thread when I was diagnosing a vacuum leak.

 

[Jroctizzle]

Also if your throttle body still has the plug for the throttle body installed you can skip 6-8 in the steps.

 

[Nick88]

Also if your throttle body still has the plug for the throttle body installed you can skip 6-8 in the steps.

Do you know if a faulty iac would create the issue I have with lack of power driving around? My guess is it would simulate a vacuum leak of sorts while driving around, I’m not sure.

 

[Keeper]

... Ive replaced the o2, cts and connector, map connector, iac and connector, tps connector and tested tps to verify is correct, rebuild throttle body, new fuel pump reg. and filter, new air cleaner, cleaned both grounds on top of manifold, new egr, almost everything.

map sensor itself?

 

[Jroctizzle]

Do you know if a faulty iac would create the issue I have with lack of power driving around? My guess is it would simulate a vacuum leak of sorts while driving around, I’m not sure.

Shouldn’t affect driving power as it just lets air in while the throttle plate is closed(unless it’s not seated properly on the throttle body), I would guess that relates to the fuel system or a faulty sensor/injector under load, did you replace the fuel filter?
I can’t remember off the top of my head if you did that or not.
I’d also replace the pressure regulator spring inside the injector housing just to be thorough as well.

 

[Nick88]

map sensor itself?

Swapped in a map sensor from another truck and it ran the same

 

[Nick88]

Shouldn’t affect driving power as it just lets air in while the throttle plate is closed(unless it’s not seated properly on the throttle body), I would guess that relates to the fuel system or a faulty sensor/injector under load, did you replace the fuel filter?
I can’t remember off the top of my head if you did that or not.
I’d also replace the pressure regulator spring inside the injector housing just to be thorough as well.

Has brand new fuel filter and new regulator diaphragm, I left the spring since it didnt even have surface rust on it, also fuel pressure reads right at 11.5