Pooter

Fabbed up a intake, 5" and 4" exhaust pipe, now im getting a engine light.
Only thing I can think of is when I started the truck back up the first time forgot to plug the sensor back into the harness, but turned it off plugged it in, and light wont go off...

Tapped the sensor into the upper elbow...

Need to pull the batteries to reset the code?

AggieJustin

Yeah, if you didn't have the sensor plugged in when you turned the key on, it will set a code.

You can do a battery disconnect to clear it, or it will clear after a few key on cycles.

Pooter

Cool, thanks
Didnt remember till I turned the truck on and saw the light

nickleinonen

i think it is 40 cycles to clear the code..

Pooter

Mine cleared itself after 10-15~ starts....

AggieJustin

The code will hang around for ~40 cycles, the MIL will go away after ~10.

DieselRV

If you get a new intake and you dont plug that air sensor back in, will you loss performance or power? anyone have any experience with this??

TAS05CTD610

The answer is yes and no.

The sensor measures intake air temperature (IAT). It adjusts fueling like a gasser except diesels factor in boost as well. Warm air is less dense then cold air, so warm air gets lest fuel, cold dense air gets more fuel. So by having it on the outside, hot all the time "technically" it will get less fuel. By having it in the intake tube it measures air temp as well. In general it will be a bit cooler do to air always being drawn in (instead of sitting on the outside just getting hot by the engine and no air flow) Is there a power loss cause of this, problably not, but you always see pro racers cooling the intake, and anything they can do to get dense air in the motor. Since the sensor is there, try and mount it back inside the tube. If not put it in the cab by the AC vent, should fuel you a bit more

On a side note, not sure if it's the IAT sensor or the ambient sensor, but one also adjusts timing based on temp as well.

TS