1986F150Six

https://www.ebay.com/itm/165078854967?hash=item266f776d37:g:oqIAAOSw0DhhRX8J

https://www.ebay.com/itm/174938328186?hash=item28bb230c7a:g:GyoAAOSwrQlhQqaf

https://www.ebay.com/itm/224500881317?hash=item34454b97a5:g:TmQAAOSw9ctgy1dM

https://www.ebay.com/itm/224316499612?hash=item343a4e269c:g:VJsAAOSw2mJgALTe

https://www.ebay.com/itm/224483279487?hash=item34443f027f:g:HCkAAOSwWGBgt6pH

https://www.ebay.com/itm/324650824664?hash=item4b96b273d8:g:mJ4AAOSwfoZgs51E

https://www.ebay.com/itm/333972230466?hash=item4dc24bd142:g:9QMAAOSwK-Fggrxf

The writing on the box indicated it will work for 1980-1986... I wondered if that was accurate? Thanks for clarifying!

https://www.ebay.com/itm/163901784398?hash=item26294ec14e:g:pDsAAOSwPjZdlyYr

https://www.ebay.com/itm/133711603258?hash=item1f21d5263a:g:7X8AAOSwwZlgZl2O

https://www.ebay.com/itm/193223603067?hash=item2cfd06337b:g:xRsAAOSwENZdz~TY

https://www.ebay.com/itm/234190916490?epid=1840235330&hash=item3686ddcb8a:g:M60AAOSwuqZhQ57K

https://www.ebay.com/itm/124904266176?hash=item1d14dfd9c0:g:DycAAOSwFw9hQ0tU

I believe this is a relisting? https://www.ebay.com/itm/154612840797?epid=11015810814&hash=item23ffa4b95d:g:OMkAAOSwTAlhFC2-

https://www.ebay.com/itm/174943825810?epid=1624323034&hash=item28bb76ef92:g:tMEAAOSwEYhhRN-m

https://www.ebay.com/itm/403169570445?hash=item5ddec76e8d:g:DhIAAOSwEnthRS5p

Thanks, Gary and Bill, for your input. Here is the deal... my son is out of country and I am looking after his truck [an original 1984 feedback system 4.9L equipped F150]. On my first drive, it ran poorly. It had an intermittent hard miss which was not dependent on engine speed. At first, I thought possibly a bad spark plug wire as it seemed worse while under load, but after stopping for awhile, when restarted, the truck ran well for the return trip. I raised the hood with the engine idling and performed a "jiggle test" of the wiring harness. When the wire [it looks white to me, with no other markings] on the passenger side was jiggled, the engine stumbled. Upon closer inspection, this wire which is small gauge has numerous cracks in the insulation. I suppose this is due to age and the fact that this wire resides above the exhaust manifold.

I agree, Dane!

I just found this and I will study it. https://www.garysgaragemahal.com/electronic-engine-control.html

It will bring a good price.

I have looked, but have not found a description of the function of the white wire which is connected to the end pin of the test plug connector. Thank you in advance.

Nice!

This is an example of what this forum is all about!

I think the older style is more beveled on the rim.

Jonathan, Gary had tried numerous times.