Guys I did a search and did not find much.

What determines the operation of the IC pump?

Bob

 

Bob:

It runs all of the time, starting shortly (30 seconds or less?) after vehicle start, as long as one of the measured inlet temperatures (I think IAT2) is above a critical level (60 degrees F, I think).

If it's really cold out and you just start the truck and let it idle, the pump won't come on for quite a long time. Whack the throttle a couple of times hard, and the intake temperature will get high enough to trigger the pump. Ditto also if you let the coolant come up to temperature - you'll get enough heating throuout the intake to trigger the pump.

If it's warm out, the pump should come on shortly after starting the truck.

Your tuner should be able to adjust the temperature at which the pump comes on, if it's an issue with you.

Real-world, the trigger point of the pump really doesn't come into play. If the engine is warm at any realistic air temperature, or if you build any boost, or if it is above 60 degrees or so outside, it will be running.

 

I think Sal has all of the correct answers to this, as he's posted several times on this topic. You might shoot him a message.

 

Thanks for the info

I was filling my IC today after cleaning the it and did not see the pump running but I had just started the motor and it was idleling. It did come on after a few minutes of the motor running.

Just curious as to what triggers it.

Bob

 

Sounds like you're just fine, Chief.

 

the secondary air temp sensor (right side of lower intake around #2 coil) is what turns on the pump also at approx.70* per the training lit.

 

There you go - IAT2 above 70 degrees.

Good looking out, 5.4!