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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