Alright guys, just started noticing the following symptom with the truck.

When I put the truck in park, the idle drops down kinda low, and truck runs kinda rough for a second. Im thinking either TPS (been replaced one time), IAC (clean or replace this weekend), or battery maybe.

I just have put the HID relay kit on the truck which powers the HIDs directly off of the battery instead of through the trucks electrical system. But I dont think this is the cause, it does it with HIDs off as well.

Any ideas, or do you think ive hit it on the spot. Also, I think I am going to be replacing spark plugs and wires this weekend and cleaning MAF.


In the videos, you can hear me put the truck in park.

 

You still haven't replaced those spark plugs?

 

heck no, my buddy called me and wants to replace them tomorrow though. so im going to, then do a few maintainence things. but i wanna find this issue. its nothing major, but enough to aggrevate the **** out of me

 

Battery shouldn't b it since it's only responsible for starting

 

This happened to me a couple weeks ago. My mechanic told me it was probably a vacuum issue. I tried to find it, but recently it quit doing it.

 

I dk, i mean it just started and I just put relay kit on leaving me to believe it may have something to do with that

 

I can't think of how your relay kit is causing it though

 

I was just throwing it out there since it seems that the issue started shortly after. but i kinda didnt think it was since only idle goes down and nothing else

 

Just an idea. Unplug the relay kit. And see if it does it from there.

 

my truck recently started doing that too. Cleaned out the IAC but no change.

 

mine hasnt done it anymore that I know of

 

tap on the MAF a bit. clean it with sensor clean if you have it, or try swapping a known good.

also, make sure the sensor wiring is good. if you were in there poking around when you were screwing with the lights you could easily have caused an issue. they are sensitive.

 

i've also read that the IAC can cause a whining sound? I do have that kind of noise when accelerating when it's cold out until the engine warms up a bit. So does the drop in rpm when shifting to neutral or park and the whining sound point toward a bad IAC? I also cleaned the MAF and no change.

 

update. A new IAC fixed the idle issue.