so my trucks been misfiring and when i hooked a scan tool obg2 up 2 it it said cylinder 5 misfiring, so i replaced plug and coil because it smelled burnt, the spark plugs tip was also craked off. well its raining today so can't really get on her but drove her around a little and when i pull up to a red light she idle's at about 500 and it's really low and the truck kinda shakes it's bad i also cleaned the throttle body and replaced the pcv valve last week thinking that would help what can i do....

 

Did you change "ALL" the plugs or just #5 ???
If you only changed #5 COMPLETE the job and your truck will run normal
again, then you need to figure out why it happen ???

 

i only changed the number 5 plug and it still idle's low,,,ur truck is nice man, i bet it's faster than my gsxr-1000 anyways ....i'm waiting to see if the svs light comes back on and i wonder if it does what code it will throw....

 

Clean and check the IAC, most likely cause of idle problems.

 

i did change the pcv i think pass. side block rear but were is the idle air control valve.

 

I would change the plugs and the fuel filter! That would be a good place to start!!! Jim

 

change all the plugs.....and when i change the fuel filter whats a good way not to get sprayed i have the speacial hose remover is it pressurized though and u recomend motorcraft plugs

 

It is the shiny gadget on the passenger side of the intake plenum. Usually a carb cleaner wash gets these things going for a while, sometimes it just needs replacement. It needs to be removed in order to clean it. Wouldn't hurt to include a fuel filter change as well. If that fails, on to the plugs and checking coil packs.

 

what do u mean by complete the job?

 

so i replaced bank 5 plug and coil pack because it smelled it still is rough shiny thing im gonna go clean it and se what happens

 

do u mean the silver thing with a gasket on it remove and clean inside?

 

Let the truck sit overnight and open the gas cap before filter removal and you'll only need one shop rag on the frame rail under the filter to absorb the couple drips that will come out of the lines. You'll get more fuel spill from tilting the fuel filter then out of the lines. Might wanna put your oil pan under there just incase you tilt the filter and spill the gas out of it.

 

Yes, it's about the size of a tomato paste can and is on the left of the upper plenum as you face the truck. It's common for it to get carboned up and it needs to be cleaned or replaced if cleaning doesn't solve the problem. All EFI engines need the IAC cleaned from time-to-time but our Ls need it more than most.


Dan

 

Do a "search" on here and you'll find everything you need to know about the IAC valve including photos:where it is, what it does, and how to clean and/or replace it.

 

R1

When you hurt (break, melt, or damage) "1" plug, you most likely hurt MORE Complete the Job meant --> CHANGE ALL PLUGS <-- sorry I didnt explain better

Thanks for the compliment, yes it's insane outright scary even

Here's the IAC info

https://www.f150online.com/forums/sh...light=Cleaning