Bwkemp

I just got don't changing my plugs for a 40/50 mph stutter miss.

After I got done (5 out of 8 broke) I got a check engine light and cylinder 5 misfires (if it ever fires much it is hard to tell)

I tried the old spark plug, and changed coils with a different one and changed coil off if another cylinder. Still no luck.

I did have that injector unplugged while charging the plug. I looked the injector plug over and it seems to be okay.

I also tested the coil/plug out of engine and I do get spark.

The number 5 is the front on the drivers side right? (it doesn't seem to change any when I unplug that one compared to others. Just want to make sure)

This is on a 2006 f150 5.4 with 165,000 miles

The plug in that cylinder did not break off when removing.



What to do next? Test the injectors?

Thanks Brian

gone postal

I'd be checking the injector, it might have been teh cause of the miss from the beginning.

craigooo

Did you put that non conductive grease on them? i would pull the rubber boot off the coil and clean all the grease off of it. Put a little around the bottom of the boot to seal it, but that's all i would do.

Bwkemp

I did put some dielectric grease on them. I just put a dab. When trying different coils I didn't put any (pretty sure that isn't the problem. I did not put any anti-seeze grease on them (figured of they lasted as long as the first ones the engine would be wore out anyway)

BadFish523

Yes, #5 is front drivers side cylinder. It sounds like you have started in the right direction. Are you getting a code or how are you seeing that #5 is misfiring?

nrivera04

My misfire ended up needing a new camshaft due a to valve rocker/cam follower seizing up. Not common to see on the driver's side though...

Checked the connector/plug to the coil? What about the electrode sticking out of the bottom where the spring sits? Sometimes these get moisture in them and rust up a little creating a poor connection.

Bwkemp

I swapped the injector from 6 and 5. No difference number 5 still isn't running at all (or at least none at idle and still missing most or all of the time driving). I swapped coils, cleaned all the dielectric grease off, and inspected spark plug. I don't have a compression tester but I did run it without the sparkplug (fuel injector to that cylinder unplugged) and it did blow air (not a good test I know).

It doesn't throw a code now (not sure why it did before) and the test on my scanner comes back as incomplete and wont tell me how much it is misfiring (torque pro app) I did have the battery unhooked and the leads tied together before today (hoping to reset the computer and magically fix it)

What to do next?

Bwkemp

I also could hear the injector clicking with a long screwdriver to my ear. It went away when I unplugged it.

Compression test next?

I just cant see why anything mechanical would have changed while I was changing the plugs. Other than the beating/impacting/and wiggling that went on.

techrep

iTrader: (1)

Did you install the old boots and springs on the old cop’s

Bwkemp

I bought 6 new cops before changing the spark plugs (with new boots/springs). I have tried new ones and old ones, along with switching ones off working cylinders with that one.