I didn't get the pulse width for the individual injector. I'm going to test
the coil on an ohm meter to see what's up. (Make sure the resistance is in
spec)
When it's pinging the O2 sensor reads around .80v.
Should I goto a smog shop and get the A/F mixture reading?
Tom Fox (The Mike Leech computer guy) says that he thinks it's a mechanical
problem with the cams. so let me ask the following:
----- Original Message -----
From: "BKBridges" <bbridges@flometrics.com>
To: <dakota-truck@dakota-truck.net>
Sent: Monday, September 09, 2002 5:49 PM
Subject: DML: Re: Re: Re: 4.7L HO Again!
>
> 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