Going MAFLESS and O2 less

[The Alchemist]

hey people a question:
though I'd have a look at the virtual VE table and see how close it was and have a play basically so I set up the MAF fail limit to "0" as per LS1 procedure then I went into O2 trim and put the losed loop temp enable up to 140 deg and LTFT enable up to 140 degrees and reflashed the PCM. Diasabled the MIL etc.
When I started up the engine it ran fine but the fuel trims both STFT and LTFT were still trimming away happiliy as if they had never been turned off.

What have I done wrong?

Mike

[The Alchemist]

bump......no suggestions...

[Chalky]

Is that 140 C or 140 F? Sounds like you are still in CL!

[The Alchemist]

140 C

[carneb]

The Description for {B4206} says:

When disabled, the PCM will always use
- {B3605} Commanded Fuel When in Open Loop (Normal) or
- {B3647} (not available in this operating system) as the fuel mixture table without any O2 feedback as long as table
- {B4205} Closed Loop Temp Enable is also set to it's maximum value.
If this parameter is enabled then O2 feedback (STFT) will be used with the Open Loop table.
If you wish to run total open loop disable this parameter and set
- {B4205} Closed Loop Temp Enable to it's maximum value.
Only the following values may be entered into this table:
- Disable
- Enable

Does this do the trick?

[The Alchemist]

did all that....didn't work, will have another crack tomorrow, maybe I missed something

[JezzaB]

did all that....didn't work, will have another crack tomorrow, maybe I missed something

Be curious to hear how you go. Going to try this very soon

Jez

[Redline Motorsports]

Waiting to hear as well. Just haven't got to mine yet.

Howard

[GMPX]

Sorry guys, I missed this discussion.
B1506 is the key. What happens even in 'open loop' if it could be called that is the ECM will still look at the O2 sensors once it decides they are at a working state (i.e, hot enough and voltage swinging).
Via B1506 you need to make the ECM think the O2 sensor is never ready, drop it way down in value.

Cheers,
Ross

[The Alchemist]

hey cool thanks GMPX...who would have thought....