20V MK1 Engine Swap What do these wires do?

Raptor13x · 06-15-2009, 12:57 PM

I'm finally getting around to finishing my 20v Blacktop swap, and I have a few wires left that don't have a home.

No idea what those three are for...

I'm guessing those two are for the (non-existant) air conditioning.

I just finished installing the alternator, and hooked up the battery. It cranks but doesn't start. I'm gonna do some diagnosis later on and see if it's a spark or a fuel issue.

One other point of interest: the fuel in the tank is, I assume, 87 octane, and has just over a half tank. Is it safe to run the engine on that, at low rpm, until it runs out so I can put some premium in, or should I siphon the fuel? Or what about just filling the rest with 94 octane or race fuel?

stu4u3 · 06-15-2009, 01:53 PM

I'm going to do the BT swap also.

The fuel tank has a plug at the bottom that you can drain the gas out of, no need to siphon.

mr220v · 06-15-2009, 02:05 PM

The 2 plugs in the bottom photo are the AC (single pin), and the engine bay fan (double pin).

The green one in the top photo goes unused. The two white ones I don't recognize. Perhaps cruise control if they are coming from behind the battery support.

In any event, just make sure you have a good tranny to chassis ground, and it looks like you're set.

Raptor13x · 06-15-2009, 02:16 PM

Ah yes, cruise control makes sense. I'll check the grounds this afternoon.

Thanks for the quick reply and knowledgeable answer.

Raptor13x · 06-15-2009, 02:18 PM

Quote:

Originally Posted by stu4u3

The fuel tank has a plug at the bottom that you can drain the gas out of, no need to siphon.

That involves ripping off the underbody panels again, which all the bolts snapped off of, and I currently have meticulously zip-tied in place. Plus, the plug itself tends to rust out, and I don't want to break it off and end up having to replace the fuel tank.

stu4u3 · 06-15-2009, 04:24 PM

Good to know. I saw it in the manual but I have yet to drain mine. I will be doing that in the next couple of weeks.

muffinman · 06-18-2009, 10:49 AM

Quote:

Originally Posted by stu4u3

The fuel tank has a plug at the bottom that you can drain the gas out of, no need to siphon.

Quote:

Originally Posted by Raptor13x

That involves ripping off the underbody panels again, which all the bolts snapped off of, and I currently have meticulously zip-tied in place. Plus, the plug itself tends to rust out, and I don't want to break it off and end up having to replace the fuel tank.

Don't bother anyway because the 86 didn't come with a drain plug on the gas tank.

It took me a long time to syphon out a full tank.

Raptor13x · 06-18-2009, 11:24 AM

I've decided I'll run it at low load/low rpm through the rest of the tank of 87 octane. Maybe I'll throw in a gallon or two of 94 octane.

tjmr2 · 06-20-2009, 12:04 AM

Raptor you can disconnect the fuel line at the injector rail and jumper the fuel pump then just pump the tank dry.

Raptor13x · 06-20-2009, 12:05 AM

^ Oh yeah... lol. Forgot about the easy solution.

06-15-2009, 12:57 PM	#1 (permalink)
Raptor13x Legendary Join Date: Apr 2006 Location: Farmington Hills, MI Posts: 3,997 Thanks: 7 Thanked 44 Times in 37 Posts My Google Map iTrader Rating: (5/100% )	What do these wires do? I'm finally getting around to finishing my 20v Blacktop swap, and I have a few wires left that don't have a home. No idea what those three are for... I'm guessing those two are for the (non-existant) air conditioning. I just finished installing the alternator, and hooked up the battery. It cranks but doesn't start. I'm gonna do some diagnosis later on and see if it's a spark or a fuel issue. One other point of interest: the fuel in the tank is, I assume, 87 octane, and has just over a half tank. Is it safe to run the engine on that, at low rpm, until it runs out so I can put some premium in, or should I siphon the fuel? Or what about just filling the rest with 94 octane or race fuel?

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06-15-2009, 01:53 PM	#2 (permalink)
stu4u3 Fixing up a 1989 MR2 MK1 Join Date: Mar 2009 Location: Dallas/Fort Worth Posts: 341 Thanks: 11 Thanked 4 Times in 4 Posts iTrader Rating: (1/100% )	I'm going to do the BT swap also. The fuel tank has a plug at the bottom that you can drain the gas out of, no need to siphon.

06-15-2009, 02:05 PM	#3 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 2,527 Thanks: 13 Thanked 176 Times in 147 Posts iTrader Rating: (11/100% )	The 2 plugs in the bottom photo are the AC (single pin), and the engine bay fan (double pin). The green one in the top photo goes unused. The two white ones I don't recognize. Perhaps cruise control if they are coming from behind the battery support. In any event, just make sure you have a good tranny to chassis ground, and it looks like you're set.

06-15-2009, 02:16 PM	#4 (permalink)
Raptor13x Legendary Join Date: Apr 2006 Location: Farmington Hills, MI Posts: 3,997 Thanks: 7 Thanked 44 Times in 37 Posts My Google Map iTrader Rating: (5/100% )	Ah yes, cruise control makes sense. I'll check the grounds this afternoon. Thanks for the quick reply and knowledgeable answer.

06-15-2009, 04:24 PM	#6 (permalink)
stu4u3 Fixing up a 1989 MR2 MK1 Join Date: Mar 2009 Location: Dallas/Fort Worth Posts: 341 Thanks: 11 Thanked 4 Times in 4 Posts iTrader Rating: (1/100% )	Good to know. I saw it in the manual but I have yet to drain mine. I will be doing that in the next couple of weeks.

06-18-2009, 11:24 AM	#8 (permalink)
Raptor13x Legendary Join Date: Apr 2006 Location: Farmington Hills, MI Posts: 3,997 Thanks: 7 Thanked 44 Times in 37 Posts My Google Map iTrader Rating: (5/100% )	I've decided I'll run it at low load/low rpm through the rest of the tank of 87 octane. Maybe I'll throw in a gallon or two of 94 octane.

06-20-2009, 12:04 AM	#9 (permalink)
tjmr2 Cage Fighter Join Date: Jan 2008 Location: Colorado Posts: 409 Thanks: 0 Thanked 62 Times in 59 Posts My Google Map iTrader Rating: (0/0% )	Raptor you can disconnect the fuel line at the injector rail and jumper the fuel pump then just pump the tank dry.

06-20-2009, 12:05 AM	#10 (permalink)
Raptor13x Legendary Join Date: Apr 2006 Location: Farmington Hills, MI Posts: 3,997 Thanks: 7 Thanked 44 Times in 37 Posts My Google Map iTrader Rating: (5/100% )	^ Oh yeah... lol. Forgot about the easy solution.