Hello everyone,

I've got a MY90 560SEL here that I'm working on and its having some engine issues.

When I pull duty cycle from the x11 port, I get ~10v or so. Even if I adjust the lambda tower, it makes very little change to the voltage at the port.

I always thought that when first started these cars would run at 50% duty cycle then go into closed loop and let the engine electronics take over. Thats what my m103 does at least.

Another issue its having is a lovely high idle, however the IACV, Idle Control Box and vacuum leaks have all been taken care of....

My one friend, John, said it might be the ignition coil...

Not sure if it matters, the SRS light is on as the airbags delpoyed when the PO lost a flex disc...

Anyone have any thoughts/comments?

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