Re: When did GM begin supporting the misfire DTC group
Posted to Technical Discussion Forum on 12/28/2023
2 Replies
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Hi Geoff,
I do custom GM gas based tuning for models mid 1980s to
present Most of them are done remotely via emails The
vehicle owner is required to purchase an OBD laptop based
scanner and in record mode and do test drives to collect all
feedback from the engines and auto tranny They then email
that to me and also use a PCM/TCM flash tool and email the
calibrations
I have them makeup a set custom PID group I require, which
they email to me, so I can export all the raw data and with
templates and formulas for Excel spreadsheets and analyze
all the data so that I know exactly how that vehicle
functions as to other factors such as the owner's drive
style, elevation, type of gas used, weather and if having
mods what they are
So to your question, for OBD-II alone, close to 10,000
scanner recordings and to get those on almost all cases I
first have to walk these owners how to use a OBD scanner,
and they never have used one or rarely used one but do not
know what all the data means
OBD-II alone since 2001 when I started storing OBD
recordings
[Abot 10,000 OBD-II Scanner Recording]
I even have to walk them through how to use a laptop, and
even steps on how to properly configure the scanner to how
to scan, record, export and playback the recordings
So without doubt almost in all those thousands of owner
vehicles I can say very few people understand OBD scanners
and what the feedback sensors are reporting
A lot more I have done that are older OBD-I GM vehicles MYs
mid 1980s to around 1995
Example of concurrent PIDs needing to be recorded, so I can
analyze and slant custom tune to that vehicle
[Engine PIDs]
John Rovner Owner Team ZR-1 Corvette Racers llc Greenville, Texas, USA
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