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We're not talking about motorcycles. Your understanding of the primary circuit is correct other than needing the core grounded. Why would I suggest you meter the plate while floating or do secondary waveform analysis if I hadn't already done it? And how could I have done it if the engine...

Not sure if that was sarcasm or not but I *am* an electrical engineer and just told you the specific reason it's there. I'm also the originator of the igniter grounding mod. Sure, cleaning the igniter case to chassis connection works but it's still a crappy setup and one that *will* cause a no...

The half about being isolated is correct. The no strap = no spark isn't. On the other since the strap is there for a reason you're now 2/3rds right ;) "Primary" in this sense would refer to two things: 1) a "main" ground or 2) part of the primary ignition circuit. Neither would be correct...

Depends on the plug. Some have an O ring while some have tapered sealing surfaces that can be polished out. No way to know without having a look. Assuming it's really the plug and not the rad itself it should be easy to fix though...

^ Well, you're half right...

I have to laugh at guys who think a score and few ago was "back in the day" :)

Sure there are ways of testing it. Try forcing it the opposite way you found it. For example if you found it full rich make the engine lean by pulling the brake booster line off. If it's lean shoot some carb cleaner into the booster line or feed some propane in there. Any HC based product will...

The sensor may indeed be bad. I'm just trying to teach you something you may not know. Lets say the engine is in fuel control with the sensor cross counting like it's supposed to. Then lets suppose something happens to enrichen the mixture enough to drive the sensor hard over. To use...

Well, it's going to run rich (.9 lambda) with a bad O2 sensor but not rich enough to cause that mileage loss and certainly not enough to smoke assuming everything else is working. It appears you have other problems and as was pointed out a lot of things can cause them. And although you...

Not much genius involved with reading schematics Nate but thanks for the thought. Glad to have been of help...

On the EFI engine a dirty air filter will not effect fuel economy, only power.

Yeah, see if happens on other cars. I suspect it's just hardware settling. I have the ECU code, pulled in the late 80s using an MDS and emulator, but never much dug into it.

Interesting. I can't offer much Kenny because I never noticed that and no longer have the car to confirm. My guess (and a guess is all it is) would be it's due to either the hardware settling as the system is powered up or from code that is typically programmed into MPU based systems to do...

Often caused by either the O2 sensor heater wires shorting to ground or the harness near the EGR valve doing the same...

I just don't agree with throwing parts at a problem. O2 sensors are the most needlessly changed parts on cars. Pretty sad when one considers how easily tested they are, at least for use on OBDI vehicles. That said, without going into detail about what the TCCS does when open loop, a dead sensor...

Will it matter if it's not at fault? Based on the fuel economy figure mentioned you have other problems. Then there's the lack of O2 codes but hey, at least the folks you bought a new one from are happy :)

Fwiw the online EWD is for an 89...

Depends on your comfort level. Total time in service? Other things on it can fail you know. How's the bearing? Besides, there's always the prophylactic approach. Imho the best way to do maintenance. Then again I'm biased...

Yeah, just get a new one. Much cheaper than a pin through the insulation or using the Ox terminal in the diag block....

^ What he said. And fix the code 22. The engine is not going to start or accelerate well with it, especially when cold...