The truck runs ok outside of the detonation and is still quite fast. I just
don't like the people I pass to hear all the knocking!
----- Original Message -----
From: "Tony Cellana" <acellan1@tampabay.rr.com>
To: <dakota-truck@dakota-truck.net>
Sent: Monday, December 09, 2002 2:00 AM
Subject: DML: Re: Re: Re: severe detonation problem
>
> After re-reading your original post, and someone else's response. If it
is
> a fuel problem, You are running lean, not rich. So a fuel starvation
> problem, could be a possibility. A clogged cat can also cause similar
> pinging issues. Aside from the pinging, does the truck seem to run ok
> powerwise? Down low, up top?
>
> Checking the fuel pressure is easy. There is a test port on the driver
side
> fuel rail usually. Simply hook up a gauge there (nneds to be able to
handle
> 60 psi +) The stock fuel pressure is right around 49psi.
>
> HTH
> TonyC
>
> -----Original Message-----
> From: Jim Miller WB5OXQ <wb5oxq@grandecom.net>
> To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
> Date: Sunday, December 08, 2002 6:43 PM
> Subject: DML: Re: Re: severe detonation problem
>
>
> >
> >Thanks for your suggestion. I bought the truck new and the original pcm
> was
> >reflashed about 4 years ago by the dealer for some other problem and has
> >been perfect untill recently. I will check for vacuum leaks.
> >----- Original Message -----
> >From: "Tony Cellana" <acellan1@tampabay.rr.com>
> >To: <dakota-truck@dakota-truck.net>
> >Sent: Sunday, December 08, 2002 10:56 PM
> >Subject: DML: Re: severe detonation problem
> >
> >
> >>
> >> If you are not the original owner, it may have been replaced witha MP
PCM
> >> which requires Premium.
> >>
> >> If this is the case, look at the PCM for a part#, and reply back with
it.
> >> Someone will be able to tell if its a stocker or MP.
> >>
> >> Something else to consider is an intake leak. Cracked vacuum hose or
> >> nipple, bad TB or intake gasket. You can check this by spraying some
> carb
> >> cleaner or such around the intake with the engine at idle. If the idle
> >> changes, you have an intake leak.
> >>
> >> There are other possibilities, but these are 2 of the easiest to rule
> out.
> >>
> >> TonyC
> >>
> >> -----Original Message-----
> >> From: Jim Miller WB5OXQ <wb5oxq@grandecom.net>
> >> To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
> >> Date: Sunday, December 08, 2002 3:56 PM
> >> Subject: DML: severe detonation problem
> >>
> >>
> >> >
> >> >Just over the past 3 or 4 months my 99 R/T has developed a severe
> >> detonation
> >> >problem especially at full throttle but noticable even on the cruise
> >> control
> >> >pulling a slight incline. I have changed nothing that should cause
the
> >> >problem over the past 4 years. the truck has 49k miles on it. I
> checked
> >> >inside the t'body to look into the manifold and it is very clean so I
> >dont
> >> >suspect the belly pan gasket. I have tried techron fuel injector
> cleaner
> >> as
> >> >recommended by a local garage owner that specializes in tune ups and I
> am
> >> >running 89 octane fuel but that has not helped. I hesitate to take it
> to
> >a
> >> >dealer because I am afraid all they know to do is retard the timing
> >enough
> >> >to stop the knocking and I suspect that will take a big retard as bad
as
> >> the
> >> >knock is. I know that will hurt mileage and performance a lot and
since
> >> >timing is ecm controlled it should not have gotten out of adjustment.
I
> >> >wonder if low fuel injector pressure could be the problem? I have no
> way
> >> to
> >> >check this. I do not believe there are any vacuum leaks either. I am
> >open
> >> >for suggestions because right now I have to drive very gently to avoid
> >> >knocking. Any help would be greatly appreciated. I may have to make
a
> >> trip
> >> >to Pflugerivlle.
> >> >
> >> >
> >>
> >>
> >>
> >
> >
>
>
>
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