My truck will be idleing in park and about once every 60 sec. it will have a hickup.Changed the filter but still does it.Anyone else have an issue like that?Or am I just listening to much.......

 

my 99 did that, and hopefullly its the not the same as what yours is doing, because it was the start of many problems. and i cant tell you what it was, because no mechanic that i brought it to knew. hopefully someone here does. good luck!

 

lift pump ya think?

 

My '03 did that, and it turned out to be the return valve off the CP3; the CP3 was replaced under warranty.

 

My SO has been doing something similar I think. It will idle up and then idle real low at a stoplight or when I stop after driving. It will idle so low that it almost acts like it wants to stall out. It seems to do this every other day or two.

 

my idle stays the same but its like a quick hickup about every min. or so

 

my 05 did the same thing for about a month went away on its own,never came back 4 months now.

 

Mine only does it when it's cold. I pretty much disregard it because it is so quick. I think it does it more when I put it up on high idle, cause I don't notice it at normal idle.

 

Mine does it every once in awhile. Usually happens when the engine is warming up. My best guess is it's a glitch in the ECM programming.

MikeyB

 

Only on warmup.........then when its warm, if the fuel filter has a bunch of miles on it, it will seem to have a ever so slight rough ldle......then go away.

Always been told its "normal"

 

This is just a HUGE guess on my part since I've noticed it too on my 03 HO and it only happens when its colder weather.

Could it possibly be the computer adjusting the injection timing a smidge where it reads the engines temp going up slightly? This sudden change would probally result in a slight skip I would think.

I don't know how exacting the ECM is with its controls or if its even capable of this... hence just a guess on my part.

....... Preparing for the experts to chime in and give a real response.....

MIke

 

mine does that when its cold, but its just the intake air heater cycling.

 

mine did it real quick you could barley notice it then one day she just died on 600 miles form home. luckly warrentied coverd it. it was the dreaded lift pump. They said it was from running poor fuel. I was like what !! i dont get it .