I checked the fuses and all seems good there, correct voltage.
I did some servicing today to get the baseline sorted. New plugs, leads, distributor cap, rotor arm, air filter and oil change and filter, cleaned the MAF. Still idles rough!
I investigated the O2 sensor problem a bit more. The sensor output voltage isn't fluctuating between 0.1 and 0.7V, it's just steady at 0.6V. Reference voltage is correct, supply voltage and found are both good on the O2 sensor, Ground is fine on the MAF. I couldn't check the voltages on the MAF as I couldn't work out how to probe the connector with the MAF plugged in. Assuming those are correct, though, it looks like the O2 sensor is indeed faulty!
I sprayed brake cleaner around the inlet manifold, injectors, vacuum hoses. Nothing happened so it looks like there aren't any air leaks. There was a hint of smoke from the oil filler cap when I did the oil change, though, so I wonder if the crankcase breathing is in order.
I'm going to order a new O2 sensor and see if that fixes it. Does that all sound correct?
Thanks,
James
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