04 CTSV "reduced engine power" ? HP tuners
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let me tell you the whole story, It has a crate motor LS7, 24X reluctor ring to use the stock PCM. it has been running fine for 2 years and now it is starting this. make any more sence now?
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From my limited understanding, this is a fault mode
that is entered when the PCM doesn't know what to
believe, between the various airflow estimates and
thinks maybe the throttle position is out of control.
So it limits max angle. You have a MAF, the speed
density and an alpha-N estimate and I recall seeing
"stuff" about it involving more airflow than the
TPS @ RPM "ought" to permit. Like if you went and
put a cam & decent exhaust on it, you might tune
up the speed-density part of it but the alpha-N is
just a "dumb check" and maybe all you have to work
with is error limits. I know I've run across this on
either a Corvette or a DBW truck but it's been too
long to remember. Anyway, try rooting through the
Engine Diagnostics (not DTC list, but the limits you
can fiddle) looking for stuff about "airflow error" and
see if you have any immature codes for what you
find.
I bet the Helm manual might have a decent explanation,
I only have F-body books.
that is entered when the PCM doesn't know what to
believe, between the various airflow estimates and
thinks maybe the throttle position is out of control.
So it limits max angle. You have a MAF, the speed
density and an alpha-N estimate and I recall seeing
"stuff" about it involving more airflow than the
TPS @ RPM "ought" to permit. Like if you went and
put a cam & decent exhaust on it, you might tune
up the speed-density part of it but the alpha-N is
just a "dumb check" and maybe all you have to work
with is error limits. I know I've run across this on
either a Corvette or a DBW truck but it's been too
long to remember. Anyway, try rooting through the
Engine Diagnostics (not DTC list, but the limits you
can fiddle) looking for stuff about "airflow error" and
see if you have any immature codes for what you
find.
I bet the Helm manual might have a decent explanation,
I only have F-body books.