OK guys, I really need your help with this one. I started to notice a few weeks ago that when I was sitting at idle the trucks RPM's would dip down to around 500 almost like it wanted to stall out and then it would catch back up again to normal idle. Also, if you are sitting still (in park) and mash the accelerator to 1500rpms (or higher, it does not matter) when you take you foot off the gas, the truck nearly goes dead, it goes to around 500 rpms or lower and then it goes back to normal idle. If you are just sitting still at idle the truck will dip down in RPM's like its about to die about 1-2 times a minute. Do you guys have any idea what this might be??

I cleaned the Idle Control Motor with carb cleaner and cue tips and that did not seem to help! Could that motor be bad? I thought it could be the chip, but its not....I just got new SCT Tuner and it was doing it before and after new tune.

Sorry for the long post but I really hope some of you can help me out. Thanks alot!

 

Just a guess but why dont you try checking your plugs, sounds like that could be the problem.

 

When is the last time you changed your PCV valve and fuel filter?

 

I just got done changing the plugs...was doing it before and after. I also just changed fuel filter.

What is the PCV Valve & could that be causing the problem??

 

Your pcv valve is located on the driver's side valve cover at the back, and yes if it is gummed up the valve will no longer work and will cause low fuel milage and bad idle. Here's a little more info in one of the threads.

https://www.f150online.com/forums/sh...ight=pcv+valve

 

I only have 24,000 miles on it, could it be that so soon....?

 

Let me know what happens after you change the PVC... I have 73K on mine and it recently started doing the same thing. And now that I think about it... it makes sense that it's a clogged PVC. If doesn't happen when the humidity is low and here in the Dallas area... the weather turned wet and muggy and it just started doing the same thing again.

I used RXP on one tank and used drier on another tank thinking I had water in the tank.

I am sorry you got the crud like me but I am happy someone else has the same problem.

LET ME KNOW...

 

Did you try pulling your chip? Mine was doing real close to the same thing. I have tried to make mine truck to work with a chip and it has not worked out.

Well, it worked fine for about a year or so and then all of a sudden it would just kick off, or half way kick, drop then regain real quick. If it starts happening more often I would say pull the chip and see what happens.

 

Hey... whatever happened to Silver 2002? Did you get it fixed and what did you do to fix it?

Mine still occurs every once in a while like when I don't drive it for several days....

Let me know... I am sure there are others out there that would like to know too.

 

Hey guys, I changed the fuel filter...Nothing....PCV....Nothing....
then last...I changed the IAC...and that fixed the problem. Truck idles smooth now.

 

Thanks for the reply...

Now tell me what the IAC is.... please.

 

Never mind... found it through a search

 

Idle Air Contol

 

Yep... found it... pulled it off... cleaned it... runs like a kitten. Idles much better...

Thanks...

However, as funky as it was... it just means there is more of that gunk inside... one of these days I'll pull the supercharger like everyone else and clean it up.

Not looking forward to that day... although the results should be worth it.

 

silver 2002 where in Louisiana are you?