Hi all! So I have an issue that I noticed about a week ago. When my truck is idling in park, it runs at 500 RPM, but it will fluctuate up and down. Not alot though, only maybe about 100 RPM either way. But what I am noticing is it does that when i am driving on a highway as well. I could be on cruise control going 60-70-80 and notice that it hesitates just a bit on the RPM either way. It is noticeable though. As if that wasn't enough, I changed the oil about 3 weeks ago and made 3 trips totaling around 1k miles. My low oil engine light came on and was practically out of oil. That has never happened; no smoking of the engine, oil pressure gauge wasn't out of the norm.

Suggestions?

 

Mine idles lower than normal after a few miles but then evens out the rest of the time. Only seems to do this when its not been garaged. Curious to see what others say?

I know you don't want to hear this but there's a ton of info on this forum about the 07's and oil consumption.. Depending on your mileage it's either going to happen or not. There are ways to minimize it though if your willing to spend some money, either purchase an AFM disabler or pay someone to crack your ECM and turn it off. The other options involve major motor work.

 

have you gotten the updated valve cover? could be a common issue check spark plugs 1 & 7 for oil fouling or cracked porcelain

 

That is somewhat similiar. It will even out at times with the RPM, but a majority of the times, i could notice the slight hesitation and minor fluctuation in the RPM. I actually just did a 140 mile trip for work and while on cruise control on 75, i could feel the slight tug/hesitation.

 

No, i have not updated the valve cover, is that something fairly easy to do? I did change the plugs and wires about 30k miles ago and honestly didn't pay attention to any cracked porcelain. I would need to check that as well.
Thanks!

 

What you describe sounds more like a plug or coil pack or maybe even a small vacuum leak? Check your PCV system tubing, hose ends on the tube connection points are known to crack cause an air leak.