slade25

Hello,

I recently purchased a 2008 F-150 4x4 supercab 4.6L Quite happy with the truck except for one thing. During idling at red lights (while vehicle is in drive)if it's a longer light and the truck has been idling for +1 minutes and waiting to go , it will do a sputter and cough (if you like). A friend tells me that it could be that a coil pack issue.

If I'm correct, there would be 8 coil packs in the 4.6 L engine. I have no check engine light , so cannot run a scan looking for a flagged code.

Anyone have any suggestions as to what i might be experiencing and what the best way ahead might be?

joe mcmillan

Even tho there has not been a check engine light, there could be a code stored. If so, may be helpful for trouble shooting. Your local parts store will read for no charge. Get a tuner and you can read codes among many other advantages.
Yes, 8 COPS. Once you have a code, you may be able to switch COPS from one cylinder to another for troubleshooting. No codes present, a shot in the dark.
Other than that, where to start:
- Clean MAF
- Clean throttle body
- Do relearn procedure after the above
- Check condition of FPDM mounted above spare tire
All of the above are possibilities. You can get more info on each item via the search function.

Mod (Ret.)

I'd clean the throttle body before replacing COPS; they are expensive (if you buy good ones, such as Motorcraft).

techrep

iTrader: (1)

Last tune-up ? mileage ? may just need plugs. all the above stuff mentioned needs to be done also..