I didn't want to argue because when you press the pedal, more fuel is
introduced via the injectors and the timing is retarded. It seems to be
partly lean and the advanced timing, which is normally at 38-40 degrees at
part throttle (and in conjunction with the MAP sensor issue) could be what's
causing this whole mess.
As for the "Flash the PCM" idea, there's two people who have had this done
and it didn't fix the problem.
I wish my scanner supported output to any form of file...but it's a LED
screen only.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
Subject: DML: Re: MAP Sensor "Issue"
Good question - I've sat right next to people in their trucks as they claim
theirs has NEVER pinged as we are going up a slight grade w/them marbles in
a
tin cup just rattling away. Guess some people are just "tuned" in to it
more.
Also - I've heard that you can be pinging without even hearing a thing. So
much so that it will cause a knock sensor to excite and cause timing to get
retarded. (theres that phrase again - I must have used that word too much
in
gradeschool 8-)
I haven't stopped thinking about what Bernd said about pressing the pedal a
little more to make it go away. He didn't even argue w/me a little when I
said
something about pedal down should cause worse pinging unless downshift
occurs.
Maybe he's on to something. I keep thinking about that 3D map - I wonder if
it
only occurs in a certain "region". Hmmm... my scan tool has the ability to
output to an ascii delimited text file. I might just have to generate a 3D
map
of my 360s timing curve and identify the "region" that mine used to ping in.
Bernd - does your scan tool support this? We could collect several "bad
pingers" and scan them and identify those regions on a 3D map to see if they
overlap.
Bad thing is - I believe we might be reaching the point that CC has already
gotten to. Didn't they say that reflashing the PCM would be a potential
cure?
Thats the only way to change that 3D map....
bummer
Shane
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/Coil/Wires/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
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