Re: Platinum and the 4.7 WAS Re: Re: DML Digest V5 #711

From: Jeff Durling (jdurling@directvinternet.com)
Date: Sun Jan 05 2003 - 22:34:33 EST


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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