nobox351y

iTrader: (1)

01 4.8 out a silverado swapped into an 87 suburban w/ t400
pcm and harness from the same engine

Stock other than shorty headers
Stock 01 truck fuel pump in the 87 tank

Only issue that I am currently trying to workout other than the tune is the vss. Of course you guys may see a lot more.

Stumbles on acceleration in low rpm ranges.

Will cut out intermittently cruising 30-40 mph. At highway speeds it runs pretty good.

Check out the tune and the log and let me know what you think.

Thanks,
Chris

subeone

iTrader: (5)

try this file.


also, never seen your tps go beyond 70%.. make sure your throttle is going 100% if youre at WOT.

nobox351y

iTrader: (1)

Throttle cable is a one off piece that is still under construction. It isnt quite right yet. Wanted to get it lined out before I worried about that stuff. Wanted to get it running good before I worried about WOT.

Thanks for looking at it.

nobox351y

iTrader: (1)

Took that out for a quick spin. Driveability is still the same. Still has the stumble at lower rpms at 20-40% tps.

Bank 1 is consistently high on the ltfts. Not sure why, no codes and no misfires.

Thinking it could be the shitty exhaust work pulling air in right above the 02 sensor.

Included the log file.

Compsystems

your fuel trims are all over the place. Either your pulling in air somewhere before the 02 sensor, or you have them switched side to side.

I would get that figured out before you do anything else.

nobox351y

iTrader: (1)

Ill try swapping them in the morning.