Hi Dirk,
statesman and me have discussed your MAF reading low, he pointed out that your altitude is 2000 ft which reduces BARO to 88 kPa, and this will cause lower MAF readings.
Question: do you have previous logs on this tune, we want to see LTFT's and MAF readings...?
Thanks.
Also, there's an experiment we want you to try: raise the MAF table B5001 by 12% throughout.
( your engine/parts have many miles on them... we're still hoping you get a new MAF anyway )
I installed a new GM OEM MAF. This is a quick log after the install. I have not changed the B5001 at this point.
LS1B_0200.efi
This is a log from when I did the CASE learn. It looks like I was wrong earlier when I said it did not hit 4000 RPM.
2003 2500 HD 6.0L Auto 4X4_0000 CASE learn.efi
Joe I did not understand what you meant when you said to
"Can you post the scantool log (do select all copy/paste from the text shown on the Console tab)"
2003 Chevrolet Silverado 2500HD 6.0L Automatic 4 X 4
I pulled this tune on 15 Sept
2003 Chevrolet 2500 HD LT 6.0L Auto 4X4 LS1B (OS 12593058) 2016 09-Septr 15.ctz
2003 Chevrolet Silverado 2500HD 6.0L Automatic 4 X 4
Post the text from the Console tab.Originally Posted by Dirktdolman
Ok, this log with the new MAF shows 247 g/s at 5800 rpm... this is an improvement.
Increase your MAF table by 12% and take another log.
Ok, that shows the fuel cutoff stumble...
now, do it again, and at the instant the engine stumbles, immediately release the throttle (all the way off) and let the engine spin down to idle, let idle stabilize itself, switch off ignition key and wait at least 15 seconds.
Set B3618 to EQR 1.175 to be safe.
Here is a run with the changes
LS1B_0203.efi
LS1B 7 oct 2016.ctz
2003 Chevrolet Silverado 2500HD 6.0L Automatic 4 X 4
Ok, now add 3.5% back to the MAF table.
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