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How about posting some data. How much drop do you see? Even the stock system shows some voltage drop at high injector pulse widths.

Code 31 means you are running off the limp-home map and rev limit is reduced to 3000 rpm. Good luck with that.

High output "rewound" alternators typically provide lower performance at low shaft speeds compared to the factory design. There was a discussion on this topic a few months back. http://www.supramania.com/forums/showthread.php?187450-Alternator&highlight=high+current+alternator

You need to diagnose this a bit better. First, measure the output at the alternator (B+ post to alt chassis). If that reads 14V, then your low voltage is due to voltage drop in your harness. You then need to do voltage drop tests across the harness to find out where the problem is.

That EGR hose is discontinued. Just wondering what you used to replace it?

Coolant will evaporate over time, very slowly. That is the only benign reason for the light to come on.

If the O2 sensor is disconnected the fuel trim just gets set to 100%. Whether that's good or bad depends entirely on what other things have been hacked up on the engine. But as noted earlier, what's the point? I would pinch off the jury rigged vent line and see if that does anything.

Indeed. My toyota hood struts lasted 15 years, and the hatch struts are still going.

None of the aftermarket hood struts have lasted more than 2 years for me. I've tried a bunch of brands.

Newer systems cannot be compared as they have active purge systems with vacuum pumps and solenoid controlled valves. The Supra setup is very old school, with engine vacuum used for purge. And yes, the point of the heat is to get the canister empty so it can hold as much vapor as possible when...

Sensor? I think you mean connector. Anyway, they are sold all over the place. You probably have EV1 connectors on the 550s, so in Ebay, you can search for FUEL INJECTOR ADAPTER HARNESS EV1 TO DENSO You might also have EV6 connectors or something else, so double check the pictures before...

Different markets have different emission requirements. If you want to meet the JDM standard of the day, then use the JDM canister. If you want to meet the USDM spec, then you need a bigger canister, and you need to get it hot during the purge to maximize the adsorptive capacity of the...

the canister is located near a heat source for a reason.

So you have 12 V on the Y-G wire at the alternator connector with the connector off? And grounding Y-G causes the discharge warning light to come on?

Come on this is a pretty simple circuit. 12V on Black-Yellow and Yellow-Green with ignition on. 12V on white and black always.

Buy it from Toyota. Its only $3.88. Don't screw around with something that if it comes loose will destroy your engine. 90344-53008

O2 sensor alone won't give you 11's. Multiple problems.

Well, there's only so much we can do from our armchairs here, but did you do step 1 as shown here. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=55

See this. http://www.supramania.com/forums/showthread.php?88490-Oil-Leak-Plug-on-front-of-block/page2 Could be an oil seal that popped out as well.

Use oxalic acid instead of CLR. http://www.supramania.com/forums/showthread.php?122206-Oxalic-acid-flush-created-something-when-neutralized..