wideband ve learn going nuts on merc

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vlt304
Posts: 226
Joined: Wed Feb 27, 2013 8:46 pm
cars: eh premier sedan v8 vl commodore

wideband ve learn going nuts on merc

Post by vlt304 »

as the title said my mate has 12pv112 running an 808 on his v8 380 merc the car runs quite well with a camira module and djet intake manifold with stock vs v8 injectors. figured the other day we might turn on ve learn as it has the lc1 connected and see what it might do and that is when the real head scratching started to happen. the second we enabled it the engine goes real lean and runs like crap turn it off and goes back to good. it was running 12pv111 so we upgraded to v112 with the flash tool. no change tried another 808. no change. any ideas why this may be happening? i will post up a log and bin for anyone who may be able to help. at 1min22sec wideband ve lean is enabled everything goes nuts 2min 24sec velearn is turned off and it goes back to normal.
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VL400
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cars: VL Calais and Toyota Landcruiser. Plus some toys :)
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Re: wideband ve learn going nuts on merc

Post by VL400 »

Number of issues...
- Your BLM and INT is pegged adding fuel (see pic below). Enabling VE learn resets them to no correction so it can adjust the fuelling.
- Your settings allow VE learn only above 1000RPM, your log is below that when enabling it so wont be correcting anything at that point and later when idling. Also need the MAP and RPM window settings tweaked to allow correction.
- I reckon you have a serious offset in your wideband reading. The narrowband is showing closed loop working and switching rich/lean (ie pretty much stoich) while the wideband is in the 13 AFR range.

But after all that VE Learn is really useless anyway, tune it manually for faster and better results. Have a play but dont expect magic from it.
VE Learn.png
vlt304
Posts: 226
Joined: Wed Feb 27, 2013 8:46 pm
cars: eh premier sedan v8 vl commodore

Re: wideband ve learn going nuts on merc

Post by vlt304 »

cheers for the reply and explanation makes sense the narrow band was reading crook so we unplugged it (cheap chinese sensor). offset the whole ve table up by 3 and it seems happy also gave the wideband a free air calibration just to be sure. car runs smooth and revs clean with velearn on or off now and for sure it is best to tune manual he just wanted to play with velearn to see what it did.
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