car suddenly wont start - never ran great anyway, esp. cold, now cranks, but won't st

[dannydavi]

that cold power issue def seems like tranny problem, i recently just started having a similar problem with mine, but it rarely gets that cold here. Sometimes when that happens to me, i'll shut off the car and then restart the car and it seems to work and have it's power back. As for your other issue of not starting, I'm not to clever with cars but it sounds like a timing thing... also to check if your getting fuel, just pull a hose off after the fuel pump and put the end into a jar and crank the engine. If there is gas in jar when you check then pump is working. Hopefully someone with a lil more knowledge will chime in and give you more advice.

[rjSupra]

I can hear the whoosh of fuel in or next to the throttle body / fuel rail area. I just put the ignition key in and turned to 'on' and then jumped the FP & B+ connections. I could clearly hear fuel then, so I think that part is good.

I have tons of stuff in the car so was not able to verify if the fuel pump under carpet is clicking on ignition key in. Do i still need to check that if I can hear the fuel pumping while I am doing the above bypass?

(also there is that 21 code - Ignitor / ECU and code 14 O2 sensor / ECU happening, so could that shut me down from re-starting?)

and how the heck do you know if it's a bad ECU instead causing problems? Seems like a lot in the error codes, the lower possible culprit is - ECU!

Thanks.

[rjSupra]

Checked under hood and inside foot well fuse box. All the fuses are still intact.

I also found I have an extra / surpplus MT ECU not an AT one. My car right now is AT (with stock ECU I assume) and a the 2nd prior owner was intending to swap it to MT and handed all the parts along. I suppose - from reading here - that if the ECU is toast, this one won't work for me as they are different.

[rjSupra]

So, I didn't even know the Auto Transmission had error codes too (thanks Cygnus X-1 for procedure).
I have error codes:
62
63
that are stored. According to Cygnus X-1 it means:
62 - Defective No1 solenoid or short circuit-severed wire harness or short circuit.
63 - Defective No2 solenoid or short circuit-severed wire harness or short circuit.
Don't have any idea if this could be contributing to a grouchy slow Supra in the extreme cold, and the occasional hard shift into OverDrive. ??

And one other note, my wiring harness / loom is, uh, not pretty. Looks like high temps have sort of melted / brittled away some of the black enclosing thingee, and a few wires are open and exposed in front of the CPS area... I can't really get it out, or haven't devoted the time to pull it out for full inspection, I am also sort of afraid of cracking off more of the black plastic stuff, it's very flimsy at this point. Don't know if that could be an issue and causing all of these problems??

[cre]

A bad wire harness could account for all of your problems. Personally, I'd start with testing and patching the harness but I'm more of an electrical kind of guy.

[rjSupra]

Thanks Cre.

I hear you. That might not be a bad place to start. Also, for some reason I don't think my ECU is bad, just a hunch nothing more. But my O2 sensor looks pretty old and dirty on the outside, so I bet it's old and dirty on the inside too.
I wonder if the 02 sensor is so bad and dirty and old, and the temp was so cold here yesterday, maybe it just couldn't work (air temp in the teens, maybe lower). And maybe trying to start the car the 14 + times without it starting prompted my #21 error of ignitor / ignition pack failing to start after "A" times (which for my Turbo is 3 times in a row). So would that make sense?
Can a trashed O2 sensor cause some power issues by, what, messing up combustion or timing, and account for lowered power and crappy fuel mileage?
What do other folks get on their older Supras for MPG anyway? I think I read 14-30 mpg range. It would be very nice to solve this problem, have a running car, and a break from the headaches. I haven't even had time to think about the nasty PS leak with all the other stuff.

[cre]

Your O2 sensor isn't going to cause much other then slightly poorer mileage than normal. The average mileage I've seen would be about 18MPG with mixed highway and city and a slightly heavy foot on occasion. You can unplug the O2 sensor and should see little change in the operation of the vehicle. If there is a significant change then there is a problem with a more critical trim sensor somewhere else in the system (such as the AFM).

The code could be the result of low voltage due to the cold temp and drain from repeated cranking... test the battery, the alternator and test the ignitor.

[btwilson86]

Originally Posted by rjSupra

What do other folks get on their older Supras for MPG anyway?

I'm averaging about 18-19 city driving, and that's with a somewhat frequent heavy foot.