Distributor Rotation Pulse I believe. Like cam sensor counts?
Distributor Rotation Pulse I believe. Like cam sensor counts?
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
IIRC Distributor Reference Pulses (from the ICM to the ECM). If it helps, my 88 C1500 5.7L cranks ~2 seconds when cold and almost immediately when warm with the 7747 in it. It's still the same with the EBL Flash-II.
I'm curious what you find to change that length of cranking although, I kinda agree as mentioned earlier, I like it delayed some so oil pressure can build up before firing.
Yep, that, Reference Pulse, dont know where rotation came from lol.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
i found even increasing the VE in the crank areas helped with better start ups. found this out by accident when i got carried away smoothing the VE table and discovered the car took longer to start. the other thing is increasing base timing (ex: 10* vs 0*) at the distributor. this will also need to be updated in the calibration. i also am a big fan of the newer pg260 gear reduction starters used on the 96+ gmt400 trucks.
Last edited by tayto; 11-10-2021 at 03:05 AM.
All interesting observations. Thanks everyone. Today under the choke table for afr vs temperature when cranking i decreased the afr and it started cold in what sounded like 4 engine revolutions. Which i think is better but its hard to tell because it was warmer out today than usual.
Don't know if I missed it reading from the beginning but first inclination would be to ensure the fuel pump relay is operating as it should and fuel pump is not solely running off the oil pressure switch.
Its interesting your is so much different. Maybe we are looking at different tables. Mine is cranking afr but yours just says afr? Maybe they are the same.
Capturewer.PNG
Last edited by joegreen; 11-24-2021 at 06:38 AM.
maybe because mine is from the EBL Flash-II instead of your 7747?
Bookmarks