hi everybody Im new in this forum and as the heading say I have trouble . my truck is a 2000 f150 4.6 and I like to know if my truck is SOHC or DOHC cuz about 4 months i have a missfire on cil #6 and I replace the whole 8 coils and spark plugs with granatelly brand and they suck bad now three of them dont work . and I was thinking to get newones but I dont know if my truck is 2 balve or 4 balve . any advice or comment will be epreciate thanks

 

I'm pretty sure it's a SOHC. The only 4 valve 4.6 I think were available in the Lincoln Navigator. I also know that 4.6 had an issue with spark plugs coming out due to thread failure.

As far as coils and plugs go, I only stick with Motorcraft brand, but that's because the 4.2 liter likes nothing else.

 

Your truck is 2 valve. Granitelli COPs have a terrible reputation. See if Global has them.

 

I went to the junk yard . the coils are $25 a piece. but I goin to have just 30 days guarranty . I can't decide . the MSD are any good ?

 

Stear clear of the pick & pull's for these type parts. Use the Motorcraft plugs only everyone here has had problems with other brands. Try these if yours has the COP's (Coil On Plug). They are guarranteed for life and at a good price. Others have used the one's from Uneek Auto and had good results as well here's the link. OBTW make sure you grease the boots with dielectric grease. Here's the link.

http://cgi.ebay.com/ebaymotors/NEW-I...Q5fAccessories

 

wow $69.99 look to good to be true . Im goin to stick with motorcraft . thanks everybody you guys are awesome

 

I've been running them for a year and a half or so. Do a search on COP's or spark plug change. There has been a lot of posts even testimonials. These are guarranteed for life and a full set for less that what one new motorcraft cost. You could also look for a set for the v-10 they are the same and you get 2 for spare. I've seen some guys use the ones from Uneek Auto that say they are just as good but I don't have any personal experience with them.

 

Many have had great success with the Global and as stated, they some buy the 10 pack just in case there is a bad one. They are cheap enough, you don't won't to mess with returns.

 

Only use Motorcraft plugs!!

 

The DOHC Navigator engine is a 5.4L I believe. The Aviator had the 4.6 DOHC I think. No Ford truck as far as I know ever came with a DOHC.

 

thanks roadie

 

The DOHC engine is unmistakable. The valve covers are almost 1 foot wide. If you see one, you will know.

 

Some how between my dad's truck and the 6 E-250's at work i ended up with an extra set. I could always pre-grease the boots and have them ready the next time i go into mine. Doesn't hurt to have spare parts ya know.

 

I have also used global coils with good luck. The important things are use only motorcraft NGK or denso plugs those brands have been know to work. Use LOTS of dielectric grease on the boots to waterproof them no grease = short coil life.

 

jethat thats a sweet madstang . sorry for dissapoint everybody but I order MSD . I have use it on my past vehicles and never fail