Hello everyone

I just recently installed this PCM and have only one obvious issue and thats the cold start afr will run 11.7 to 12.2. Its for sure running rich, to the point of being almost undrivable, so the WB is not the problem. It drives great when warmed up

So I know that this is a open loop function but I just cant seem to locate any table that will result in any change to the reading.

Engine is a bone stock L05 and the bpc was done to 13psi as the system is stock. VE learn has stopped suggesting any corrections although I am getting flip flop suggestions on the decel part of the table.

It will suggest like -7 on a run, I flash the change, it comes back with +7 for the next learn, etc.

VE Table - Low Speed changes also resulted in zero change.

I've read on this forum that others are coding out the open loop function using a hexadecimal editor but the instructions appear aimed at the the stock lines of code?

I cant see corresponding lines in the EBL bins.



help


TIA

John

 

Are you saying it runs good when warm but too rich cold? When running rough, misfires make the o2 sensor give inaccurate readings. A misfire leaves more oxygen in the exhaust so a 11.7 to 12.2 AFR on the WB gauge will actually be much richer than that. VE learns should only be done when warmed up to normal operating temperature. After that is all set use the Open loop- AFR multiplier vs CTS table to adjust the cold and warm up AFR.

 

As soon as it transitions to closed loop it transitions to 15 to 1 afr at idle.

It actually idles smooth when at 12 to 1 open loop cold, but if I try to give accelerator pedal to either rev it up or move/drive it, it almost dies and there's some good chugging,
the amount of oil burning smoke out the exhaust is also very noticeable along with the pig rich smell. No such issues warmed up

Once it gets to around 30ish deg C, Im able to accellerate and drive but it stil shows high elevens/low twelves AFR until closed loop kicks in.

That table you mention sounds familiar but at this point Im not sure I tried anything with it. I'll give it a go tomorow and see how it goes.

Thanks for your reply, Larry. Much appreciated

 

Ok, so no progress on the idle.

I zeroed out the Open Loop - AFR Multiplier vs. CTS and Im seeing 11.5 - 1 AFR at 89 deg C coolant temp.

I attached a datalog file and you can see the WB AFR start at 14.7 - 1 then plunge to 11.5 AFR after about 15 sec. Cold warmup seems noticeably better than my previous post.

No idea why its switched around.

Attached a screen shot of the AFR Multiplier/CTS and the data/WUD replay file


Thanks in advance