Jim,
There are some spots on the belly pan that you can't see through the
manifold opening. How close are you to Pflugerville?
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Jim Miller
WB5OXQ
Sent: Sunday, December 08, 2002 8:20 AM
To: dakota-truck@dakota-truck.net
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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