So recently ive been having trouble with my belovid truck and was wondering if anyone could shed some light on the subject. The truck will start fine but once it seems to reach operating temp or near to it anyways it will start idleing like crap going anywhere from 700rpm to completely stalling out. It will make a real bad sucking noise coming from the throttle body. The truck will however run for the most part fine at highway speeds though. Can anyone help me out?

 

Try iac

 

welcome to df.

the sucking sound is the IAC pintle moving in/out, probably trying to keep it running. the noise is sort of normal, but you should investigate if its working right or not.

idle is controlled by IAC on the rear of the throttle body. it opens a port to allow air to pass the closed throttle plate. if you remove the air cleaner you can see it. if you can keep the truck running by very lightly pressing the gas pedal, then you are bypassing the iac function - if it still won't run, then its not the iac.

tps also interacts with idle. its on the drivers side of throttle body.

now for the good stuff - if it only does this when warmed up, then it could be related to the front O2 sensor. the computer monitors this sensor when its warmed up, and adjusts fuel mix. computer does not monitor O2 when cold.

further complicating the picture - when cold, pcm and iac will idle at around 1000, which can coverup some problems. when warm, it should idel at about 600-700 which can expose other problems.

post the year, engine etc of your truck and see if you have a check engine light. check the stored codes and post back.