2006 5.4ltr
04-23-2016, 09:13 AM
#11
This is a classic problem with COP's... I've done this with several vehicles, and I have learned that this old adage is true
"The Bitterness of Poor Quality remains Long after the Sweetness of Low Price is Forgotten."
And others like it:
“Good equipment ain’t cheap, and cheap equipment ain’t good.”
“The most expensive suit is the one you only wear once.”
“Pay lots, cry once. Pay little, cry twice.”
“It is unwise to pay too much, but it is worse to pay too little. When you pay too much, you lose a little money … that is all. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the things it was bought to do.
So IMO - get OEM coils, engineered to do exactly what they were supposed to do in the system they are supposed to work in. After that, you can at least know what your problem ISN'T - which is the best thing next to knowing what it is... but inability to rule out a cause during troubleshooting leaves you truly empty handed.
I just did this same job last week, got my motor craft coils off ebay set of 8 for ~$320.
And please learn the lesson I did in this post here: https://www.f150forum.com/f4/trouble...-noise-340016/
Cheers
"The Bitterness of Poor Quality remains Long after the Sweetness of Low Price is Forgotten."
And others like it:
“Good equipment ain’t cheap, and cheap equipment ain’t good.”
“The most expensive suit is the one you only wear once.”
“Pay lots, cry once. Pay little, cry twice.”
“It is unwise to pay too much, but it is worse to pay too little. When you pay too much, you lose a little money … that is all. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the things it was bought to do.
So IMO - get OEM coils, engineered to do exactly what they were supposed to do in the system they are supposed to work in. After that, you can at least know what your problem ISN'T - which is the best thing next to knowing what it is... but inability to rule out a cause during troubleshooting leaves you truly empty handed.
I just did this same job last week, got my motor craft coils off ebay set of 8 for ~$320.
And please learn the lesson I did in this post here: https://www.f150forum.com/f4/trouble...-noise-340016/
Cheers
04-23-2016, 09:23 AM
#12
IN general, if you had no idea what was causing the misfire (but knew you had one) here is a suggested order of evaluation:
- MIL/CEL codes
- Power balance testing and/or stethescope to ID cylinder(s) that are a problem
- Verify Spark
- Check Relative cylinder compression to rule out mechanical issues
- Verify fuel pressure and injector operation
- MIL/CEL codes
- Power balance testing and/or stethescope to ID cylinder(s) that are a problem
- Verify Spark
- Check Relative cylinder compression to rule out mechanical issues
- Verify fuel pressure and injector operation
04-23-2016, 09:32 AM
#14
Could very well be bad coil. FixiTTilBroken had some good advice. I'd have an active scan done, that'll help you see a myriad of things and will more than likely point you to the culprit. Misfires are tricky little devils..
Question, because I've seen this before; when you put dielectric on the boot ends, you did't put any on the actual spring did you?
Question, because I've seen this before; when you put dielectric on the boot ends, you did't put any on the actual spring did you?
04-23-2016, 09:36 AM
#16
I put petroleum jelly on mine, springs and all.... no issues. I researched to find out if dielectric grease was fundamentally different from vasoline's dielectric constant - it appears they are almost the same. I guess if I have issues in the future I'll have one item to eliminate as a possible cause.
04-23-2016, 09:40 AM
#17
Ok, just checking. I'd start by a scan then. Try and track it down and see which cylinder(s) are missing and go from there. Could be by plug,coil or even an injector. Start small and work up. Plenty of 5.4 gurus on this site to seek assistance from. Keep us gainfully informed and good luck!