With that many miles I would change them all.. The coils. The connectors in the coils get corroded. The bolt area cracks etc. Just did mine. like $220 from amazon only use motorcraft coils imo.

DG508

 

Correct plugs are good for 100k I would do 80k. get some new cops and leave the plugs for a while.

 

Are you sure the OEM boots are AC Delco?
I have read several people saying that Denso was the supplier for the OEM COPs.

 

I have the torque app and one the bluetooth modules, but there are no codes being thrown. No check engine light. From what I read I will need one of the OBD tools with Mode 6 capabilities.

 

You will need to look at PENDING CODES to see the misfire. You practically have to have a dead cylinder before an error code is set, so pending codes are your best friend.

 

I will try that with the bluetooth adapter I have. Are they all equal as far as the data they return? I paid 99 cents for mine off Ebay

 

Put the Torque app on "test results" and drive it. The Mode 6 test 53 misfire results will show up eventually, looks like this:


misfire counts in Torque app on "test results", the last digit is the cylinder #

 

The original COP assembly is a Denso product not a AC Delco product.

 

I'm having the same issue with my '99 5.4 2v with 65k on it. Pulling a 10k 5th wheel, it definitely gets annoying. I don't daily drive mine, but I'll try to remember to hook up my Blue Driver OBD II scanner to see what it says next time I drive it. It has mode 6 data, can scan all the systems (not just the CEL codes), and it a pretty good deal for $100, IMO.

 

I went out at lunch and tried an app on my laptop that pulled $53 codes, but the CID listed with them weren't cylinder numbers. I'm assuming I should see 1-A or 0-9.
I couldn't try the torque app on my phone since bluetooth isn't working, so I'll get a tablet when i get home and give the Torque app a try.

 

You should get a P03xx code. xx would equal the cylinder number. P0303 would be cylinder 3. FWIW, if your check engine light flashes that is an indication of a misfire and that code should be set.

 

I downloaded the Forscan app for my computer, and it's showing misfire for cylinder 8. So I'll do some troubleshooting with coil/boot on that cylinder this weekend.
When I opened up the forscan app, I did have 3 trouble codes showing, but the check engine light is not on. P1000, P0316, and P0325. Should I be concerned about eh P0325 code or is also related to the misfire issue? Why would it show on this app, but not have a check engine light ? It also didn't show on the torque app (lite).

 

https://www.ford-trucks.com/forums/5...t-come-on.html

 

Just a note. Some early ford's won't throw a missed cyl code at all. The computer just can't do it for some reason. Disconnect it yes or short it yes but miss fire good luck.

 

Good Info.....thanks