does it really matter if i replace them or is it a waste of time and money i was thinking of e3's or boush 4's is it really a nitemare to take them out in an 05 as it is in an older model

 

Dont' bother with either of those, bosch 4's are crap in american trucks. Use any single platinum or the denso iridium if you want the increased performance. You have to be able to gap the plugs to install properly, so no bosch 2's or 4's. No, replacing earlier than scheduled won't help you much, unless you upgrade the igition, i.e. coils and iridiums.

 

You better ask before you touch that motor - you don't know what your doing.

Bosch Plugs!! You almost screwed your motor up..

 

i would stick with a good set of autolites. never failed me yet

 

I think the best plug to use is what the manufacturer uses - since these motors are so picky -

Motorcraft Plugs.

 

bye the way i know what im doing i was just looking for some input thanks to the other guys for giving me some decent feed back i will just stick with the motorcraft that seems to be what the smart thing to do is

 

Do you have a 4.6L or a 5.4L engine ?

 

If you have a 2005 then there should be 3 engine choices. The 4.2 V6 and 4.6 V8 which both use ordinary plugs and are relatively simple to change. Any major brand of your choice with one ground wire, not the +4's that Bosch has, and you will be fine. Double platinum plugs are a good choice and last longer than all the other types except for the iridium ones. If you have a 5.4 it has a special plug that uses a loop for a ground wire.




If you look closely you will notice that the plug is extended. The design of the cylinder head requires that the plug be of this design. It sits in a recess in the combustion chamber and this area below the plug threads can get carbon fouled. When this happens the plug jams and breaks. You are then left with a mess that requires special tools to remove the plug without pulling the heads. For normal removal and replacement Ford recommends a special procedure that involves penetrating oil and loosen / tighten to break the plug free of possible carbon build up. I would recommend removing the plug every 25,000 miles just so that the carbon doesn't build up. Maybe a motorvac treatment to keep the carbon away too.

JMC

 

i have an v8 4.6

 

I had a '97 cobra and never heard anything about the +4's. Thought I would give them a try. Wow what a waste of $50. They fouled at about 1,000 miles. Swapped them out with a set of champion 1.99 plugs, and never had a problem in 30,000 more miles. Anything Bosch is pure junk.

 

NGKs.

I believe the stock equivalent replacement plug for the 4.6 would be the NGK TR5.

 

Actually no, anything Bosch is not pure junk. The platinum plugs do not work in many vehicles and thus are a waste of money. If you have ever attempted to get a smooth idle etc in an older BMW or highly tuned motor, you might know that certain Bosch plugs work wonders for smoothing out the idle and fixing any dead spots in the power band. Their normal and silver plugs work quite well in the 100,000's of miles I have used them.