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The hard reality is you're stumped because you don't know what you're doing. Again, what you have is a minor problem any first year electrical student should be able to resolve using simple methods you haven't even tried. I could do it with my eyes closed. This car isn't the space shuttle you...

No, because it's job is not to power the electrical system. That task falls to the battery.

Welcome to Previous Owner hell. POs are whined about often here which is ironic considering many of those doing the whining are future POs who will obviously be just as guilty. Here's hoping you won't be one. I suggest you first correct everything that has to do with the EFI system then go...

What you need is to take the advice given in another thread and do signal tracing. The ECU doesn't operate off continuity you know. What you have is a simple problem that should be easy to resolve. Far easier than building a new harness. Or perhaps you should accept you're not cut out for this...

The light comes on. You must have had someone else wire it ;)

^ It's a bit more complicated than that but close enough. The stock sensor is indeed special in some respects but most any zirconium sensor will work well enough to avoid what he's seeing. However if it can't be driven it lean and rich around the stoichiometric point the engine will never...

You don't need another switch. Just the one breaking the wire between ground and term 86. One terminal on the switch goes to ground while the other goes to 86. As I said wire it like the diagram and it'll work. The diagram above will result in a direct short.

Radio Shack? Lol...

Warm the engine up. Measure Vf with the diag *jumper in* and the engine at 2500 rpm. You said it's 5 volts right? Pull the brake booster line off. What does Vf do then? Or measure OX in the diag block (use millivolt scale on the meter) and do the same thing. Does it drive the sensor lean...

It means a switch is there to connect the ground to 86 when you want the fan to run. The switch is depicted as that sloping wire between ground and terminal 86. Wire it like that diagram and it'll work

Now that's entertainment ;)

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Sorry, I don't do tax advice. It's like cars: to be successful at it requires investment in time and knowledge. I just find it hilarious when someone boasts about how big of a refund they got. Kind of like when I see youngsters pouring thousands of what little disposal income they have into...

Lol. Anyone who would let the gum'mint keep their money for an entire year interest free has a lot to learn about paying taxes...

I like the Crimestopper RS or CS systems, especially the slightly outdated models because they can be had for cheap. A one-does-all box. Long range alarm with shock sensor, remote start and keyless entry along with multiple AUX outputs for trunk or fuel door popping, etc. It'll also integrate...

It should be in one of the midrange steps under steady state conditions with around 2.5 volts or so being optimal. That said in this case looking at the learned value is less useful than looking at the emulated feedback signal, which requires looking at Vf with the diag block jumpered and the...

As stated the stock system is very reliable and 5 minutes with an ignition scope would show you how capable it is. Mine has performed flawlessly with original components for over 21 years. Then again I maintain it and don't do stupid stuff like open circuit secondary firings.

These day I run 6. It's actually 5 because my bypass filter sucks up one quart. With it like that the level is on the full mark with the engine freshly shut off and where the wire begins when it's cold. That said I ran exactly what the owner's manual states (4.2 quarts) for 17 years and never...

^ Nah, replacing gaskets on a 276K engine will make it like new...

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