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Old 03-11-2009, 03:58 PM   #1 (permalink)
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Help me identify 2 plugs in engine bay

For starters: 1996 Toyota T100 3.4L V6 2WD

Yesterday I replaced my engine wiring harness. Now i have 2 extra plugs in my engine bay. I know(think) one of them is the Engine temp sensor...whatever one is linked to the dash. My engine temp guage doesnt move at all.

The other problem im having(with a picture of the other plug) is a weird throttle condition. While taking it easy the truck runs normal. But if i get on it, and get RPM's past around 4k, my idle becomes very high. In park/neutral, it shoots up to around 3k rpms. Yesterday when i discovered this, i tested from a stop, and got up to 40mph(in second gear,without ever touching the gas). It also fights my torque converter making it increasingly difficult to drive in parking lots or come to a complete stop.

Ive attached 2 pictures...i couldnt get the plug that i think is the engine temp plug to show up in the parking garage i am in. Ill take better ones tonight if need be.


What i need is for someone to identify the location of where these 2 plugs plug in.
The one on the left is a grey plug, 2 pin i believe(see picture) and it splits off the engines wiring harness right next to the throttle position sensor i believe.
(see Picture below)
The second plug is a dark green one, located on the right side of the block, near the back end.

I cant find where to plug either of these into. Im really hoping its not under the intake manifold/plenum, and i feel like i would have noticed that before i put them back on.

Does anyone know where these plugs go?
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Old 04-07-2009, 05:19 AM   #2 (permalink)
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Can't see any piccies...

It sounds like the gray plug goes to the IAC valve which is located right under the throttle body. That would create the high idle issue that yer having. I'm surprised it didn't throw a check engine light (CEL) on you...

It's pretty easy to plug the IAC plug in. Just remove the air intake hose going to the throttle body and plug her in. You might be able to do it with pulling the hose but it's better to see where it might go than gitting a peek and trying.

Not sure about the dark green plug...I'd have to go outside and check the right side of the engine (passenger side) and see what's on that side.
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Old 04-08-2009, 02:12 PM   #3 (permalink)
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Okay...looked over my 1998 T100 3.4L wiring harness...

The wires that branch off of that loom are:
TPS (3-wire, black plug)
Fuel injection (2-wire, gray plug)
IAC valve (3-wire, gray plug)
Coil pack (2-wire, black plug)
Bundle to the rest of the fuel injectors/coil packs

The high idle can still be attributed to a sticking IAC valve. I would go and clean it.
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