William,
If that cylinder is running lean it will also misfire. Did you get the
pulse width info from the scan? A cylinder by cylinder injector
interrogation would tell you whats up with #8 @ WOT. If its a bad injector,
it might be hanging at a higher duty cycle... The HO motor has higher
compression as well as the stiffer cam so I would think you wouldnt be
pinging that badly by just using the cams. A scope can tell you if the
ignition coil is bad. An A/F reading can tell you if its too lean at WOT as
well. Id go that way before replacing anything yet! With the ping and the
misfire Im thinking its too lean... New injectors or a KB boostapump?
Bruce
----- Original Message -----
From: "William H. Hiatt III" <william@hiatt.net>
To: <dakota-truck@dakota-truck.net>
Sent: Monday, September 09, 2002 4:23 PM
Subject: DML: Re: Re: 4.7L HO Again!
>
> I'll look into that.
>
> In the never ending quest to solve the problems with my truck, I went to
the
> dealer today to take a look at it through the eyes of a DRB-III.
>
> Everything seems to be ok, except #8 misfired 15 times in about 2-4
seconds
> (At WOT).
>
> What could be causing this? Bad ignition coil? The whole thing still pings
> pretty bad at medium/heavy acceleration. Could this all be related?
>
> Thanks
> william
> ----- Original Message -----
> From: "BKBridges" <bbridges@flometrics.com>
> To: <dakota-truck@dakota-truck.net>
> Sent: Monday, September 09, 2002 4:14 PM
> Subject: DML: Re: 4.7L HO Again!
>
>
> >
> > William,
> > The new valve springs will reduce float due to the higher lift at full
> rpm.
> > Id do it in the long run, but its not manditory to get it running
> right....
> > A scanner shure would help to figure out whats going on!
> > Bruce
> > ----- Original Message -----
> > From: "Willliam H. Hiatt III" <william@hiatt.net>
> > To: <dakota-truck-moderator@bent.twistedbits.net>
> > Sent: Monday, September 09, 2002 12:01 PM
> > Subject: DML: 4.7L HO Again!
> >
> >
> > >
> > > In my never ending quest to solve Ed's (as well as my) pinging
problem,
> I
> > > stumbled across this:
> > >
> > > The 4.7 flows 22.5 lb/hr @ 49psi, while the 4.7 HO flows 25.8 lb/hr @
> > 49psi.
> > > Is this difference in the injectors, or is it all in the PCM? I'm
> thinking
> > > my pinging is because the truck is leaning out when you snap the
> throttle
> > or
> > > on acceleration.
> > >
> > > Also, the 4.7 valve springs are as follows:
> > >
> > > 6.69 coils
> > > 3.28 wire diameter
> > >
> > > While the 4.7 HO valve springs are as follows:
> > > 7.30 coils
> > > 4.77 wire diameter
> > >
> > > Is this something to warrant changing as well (I know it won't affect
> > > pinging/etc, but just for longevity sakes)
> > >
> > > And last but not least, the 4.7 HO spark plugs. They have a platinum
> rivet
> > > located on the tip of the center electrode. Why would Dodge run these
> > > platinum plugs in the HO?
> > >
> > > Thanks
> > > william
> > >
> > >
> > >
> >
> >
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:05:20 EDT