It will vary depending on a variety of sensor inputs (BARO, CTS, BTS, IAT,
O2), but normally it'll be somewhere in between 4-12.
Are you sure it's not the roller rockers you're hearing?
- Bernd
-----Original Message-----
From: WiLieR[SS] [mailto:waffle787@gmail.com]
Sent: Friday, May 04, 2007 8:40 PM
To: dakota-truck@dakota-truck.net
Subject: DML: Timing 3.9 v-6
I know the timing can't be adjusted by rotating the distributor and such,
but what is the base timing of a 96 3.9 v-6 when at operating temp and at
idle? I am having so tapping issues andf have exhausted all the upper end
engine possibilities. New parts are as follows:
lifters, head gaskets, 1.7 harland roller rockers, valve springs, pushrods,
intake gaskets (including plenum pan), heads completely checked over with
some blending and polishing work done.
The tapping is not a ping or knock as I have tried everything from 87 octane
to 93 octane with octane boost in it. I can hear the noise in both cylinder
heads and the exhaust manifolds with a noticeable noise in the exhaust tone
(no cat and flowmaster 40 series). It is a rhytmic tapping that cahnges
with rpm. The tapping goes away when the engine is under load but reappears
immediately when not under load (cruising, idling or deceleration). It is
loud enough to be heard as an echo off close buildings, bridge sides,
fences, etc... I have tried 10w-30 and 20w-50 oils with no difference at
all. Oil pressure is strong, even when the engine is warm.
It is driving me nuts! It literally sounds like a garden gnome high on
caffiene and sugar pills in my engine with a ball pein hammer!
Any ideas? Much more of this will cause me to start randomly smashing those
little gnomes when I see them.
WiLieR
This archive was generated by hypermail 2b29 : Fri Jun 01 2007 - 09:06:10 EDT