8746 bpw conversion from ALDL
#1
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Car: 1991 Firebird
Engine: 355 TBI
Transmission: WC-T5
8746 bpw conversion from ALDL
to help me troubleshoot this cold start idle hunt (as well as wot dc) I output sync bpw ($AA msb -- as i understand it the lsb is not that helpful at such a slow rate) to winALDL in place of promid.
my question is how do I interpret this data ? there are many posts which detail how/when an injector goes static, and typical duty cycles, but they are all in terms of millisecs or usecs -- but how do I get there from here ?
-and am I converting the values in the sensor field or raw ?
TIA
my question is how do I interpret this data ? there are many posts which detail how/when an injector goes static, and typical duty cycles, but they are all in terms of millisecs or usecs -- but how do I get there from here ?
-and am I converting the values in the sensor field or raw ?
TIA
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are these are uncharted waters (I highly doubt) ? does no one have info on pulse width conversions from ALDL to milli or microsecs ?
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Car: 1990 Chevy 454SS
Engine: 454
Transmission: TH400
Originally posted by adambros
are these are uncharted waters (I highly doubt) ? does no one have info on pulse width conversions from ALDL to milli or microsecs ?
are these are uncharted waters (I highly doubt) ? does no one have info on pulse width conversions from ALDL to milli or microsecs ?
for readings in microseconds (uSec), multiply by 15.25
for readings in milliseconds (mSec), multiply by .01525
My ecm had a max of around 12 mSec, and min of like 1403 uSecs, numbers may be off some, but it was listed that way in the hack.
Hope this helps somewhat. You will have to take the raw value, and multiply that, use WinALDL's logging function, if thats what your using. Your probably just interested in if it is maxing out or not. Probably easier to have it xmit both msb and lsb, and that way the conversion from the prom ID log entry might be easier.
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Car: 1990 Chevy 454SS
Engine: 454
Transmission: TH400
Originally posted by adambros
thats what i was looking for . . . thanks !
thats what i was looking for . . . thanks !
It might be different for your ecm, GM tended to mix things up abit. But its somewhere to start.
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