Hi,
so after I can see no wires touching from my MAFS, something still messes with air fuel ratio pretty drastically, I think it is related to drivers side MAF because when I disconnect it it runs rough (but due to open loop mixture without the MAF data going to the ECU) but better than with it connected also its sometimes hunts at idle just a bit (no ASR ABS lights), so what else is in that circiut or where else does the ECU gets its calculations from? I guess it could be o2 sensor or coolant temperature sensor- which is part of my question- can o2 sensor or coolant temperature sensor affect air fuel ratio drastically enough to make it go crazy like in my case? I can definately tell its running on all 12 cylinders and smooth enough but it sputters in the exaust quite a lot due to bad combustion caused by overly rich mixture. Prior to this condition it ran suprisingly fine for a while.

What else could be causing rich air fuel ratio (I base my information from cluster board computer test output which indicates fuel consumption in liters/hour) or timing (knock sensor?)or whatever it is?

thanks for any answers

Hello,

What year is the car? Do you have an OBD port to read codes?

O2 Sensors can affect. I am installing O2 sensors due to misfire code on my V12.

Vacuum leaks could be another issue.

I also checked my plug gaps.

__________________

1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com

hi, I probably have to rewire it all the way to the computers, as I just cut it where I could no longer see cracking isnulation, but I guess its probably similar scenario as this guy experienced:
https://www.youtube.com/watch?v=YxYg0iwF

the wiring (probably) even melted my MAF sensor on drivers side, but I still have another one which when I plug it in is reading extremely rich like almost wot at idle, which is again exactly the same scenario as I had before rewiring the MAF connectors...