My fathers '02 Cherokee Overland with the 4.7 HO in it didn't have platinums
in it. FSM for it says the same thing that the Dodge one does.
Jeff Durling
----- Original Message -----
From: <B1LLYW@aol.com>
To: <aol@dakota-truck.net>
Sent: Sunday, January 05, 2003 11:18 AM
Subject: Platinum and the 4.7 WAS Re: DML: Re: DML Digest V5 #711
>
> In a message dated 1/5/2003 9:33:01 AM Eastern Standard Time,
tkoth@cox.net
> writes:
>
> <<< But what I want to know about
> is the source for the information that a couple people
> stated that platinum plugs are BAD for the 4.7. I need to
> know more details rather than just a statment that they're
> bad for it. C'mon folks!!! Help me please!!!>>>
>
> From page 8I-20 of my 2002 FSM:
>
> "CAUTION: The 4.7L V-8 engine is equipped with copper core ground
electrode
> spark plugs. They must be replaced with the same type/number spark plug
as
> the original. If another spark plug is substituted, pre-ignition will
> result."
>
> Now, this is pretty typical because they want you to buy their plugs. But
I
> think the fact that they specify that your truck comes with a "copper core
> ground electrode" plugs is interesting. They could just tell you to use
the
> same plugs without getting into the detail of saying "copper".
>
> My understanding is that the coil on plugs design provides more consistent
> voltage than older systems. At least on the 4.7 however, although it
> provides more consistant voltage, the coil on plug system provides less
> voltage than a traditional coil system. And in fact, doesn't provide
enough
> voltage to fire the platinum plugs effectively. That's why copper is
> recommended.
>
> Now I just heard something the other day that is interesting. Supposedly,
> the Jeep 4.7 HO motors spec out a special platinum plug that they come
with.
> I wonder whether there are ignition improvements (better coil packs, etc.)
on
> those motors that could be swapped over to regular 4.7's.
>
> Bill White - http://www.bionicdodge.com
>
> '02 Dakota QC 4x4, SLT +, 4.7, 5 spd, 3.92 LSD
> '95 Dakota CC 4x2, SLT, 318, 5 spd, 3.55 LSD
>
>
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