Lambda is the ratio of the engine's current AFR to the ideal stoichiometric AFR (14.7 for gasoline). Tuners use it because it doesn't vary with fuel (diesel, E85, etc.) - you'll always know what 1.0 lambda means. Less than 1.0 is rich, greater than 1.0 is lean.
15.3/14.7 = Lambda of 1.04
CMC #50
To piggyback on this, E10 stoich is 14.3:1. All O2 sensors read in lambda, the readout to the end user is typically in AFR. If your wideband is configured to read AFR based on a stoich ratio of 14.7:1 and you're running E10, the AFR readings will be inaccurate. Because it's based on lambda, however, if your E0 target was 13:1 and on E10 your gauge reads 13:1, you're still at the same lambda and therefore damn close to where you want to be. Only difference would be the delta in the motor's lambda preference between E0 and E10 assuming there was one.Originally Posted by Sook
RM CMC Director
Looks like I found at least part of my issue. Even though the engine was running smooth the plug going to the #8 coil was not all the way plugged in. That is what the P0358 code was for. I ran it on the trailer after clearing the codes and plugging in the #8 coil and no codes now. I still don't see how that makes the engine run so damn lean but we will see.
JJ
Spark plug wires will get ya every time
Al Fernandez
It was actually the wires that connect the coil on plug to the harness since there are no spark plug wires with coil on plug.
Jerry
Well I’d be lost then
Al Fernandez
That bank would have pulled fuel out because it saw unburned fuel in the exhaust stream.
RM CMC Director
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