kalgra

My car suddenly started spitting black smoke and soot out the exhaust and threw a handful of codes. I also noticed a small power loss

16534 - Oxygen (Lambda) sensor B2 S1: Malfunction in Circuit P0150 -35-00

16684 Random/Multiple Cylinder Misfire Detected P0300 -35-00

17966 - Throttle Actuator (G186) Electrical Malfunction P1558 -35-10 Intermittent

I imagine the black smoke and soot is a result of running too rich which would make sense given the codes. My question is what is more likely to be the culprit, the throttle body actuator or a bad O2 sensor? Perhaps a faulty EGT sensor?

Oh and I am stg 3 running a Sportec 91 oct file.

Thoughts?

low rider

which one comes back first. With those codes it looks like your Thgrottle Body is going or is gone, but it's funny that it says it's an electrical issue as well as your 02 electrical culprit. Maybe it's a grounding issue/electrical short somewhere in the system. I find it odd you have several electrical issues at the same time. I say, reset the codes and see which one comes back first. But what do i know, I'm a hack !

Nigel (no more S4)

The O2 sensor code is the drivers side pre-cat sensor, so it's pretty easy to visibly check the wiring on that one. It runs from underneath the coolant tank to the DP. Check that.

If the EGT were bad, it would throw a code specific to EGT, not O2.