what is the sensor with the green/black wire? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-25-2001, 08:22 PM Thread Starter
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what is the sensor with the green/black wire?

On a YJ 258, there is a sensor that goes into the block toward the back by the firewall that has a green wire with thick black stripes on it. Can anyone tell me what this sensor is and what it does? I have a Howell TBI on my 258 and realized today that this wire and sensor are not connected to anything and sense that it might be why my engine keeps flooding. Anyone know? Thanks.

Donny

1987 YJ 258 I6, NV 3550, TFI Upgrade, MSD 6A, TFX Exhaust, Smitty Sure Steps, Howell Fuel Injection 2.5" Rubicon Express Extreme Duty lift, 2" Body lift 1999 Cherokee Sport, Stock
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post #2 of (permalink) Old 10-25-2001, 08:55 PM
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Re: what is the sensor with the green/black wire?

Which side and are you sure it isn't in the head becaue the only sensore I can think of that is that far back is the temperature sending unit(in the head way back on the drivers side. It could also be the oil sending unit(pasanger side middway on the block. I would go out and check for you but its to dark. Sorry

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post #3 of (permalink) Old 10-25-2001, 09:29 PM
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Re: what is the sensor with the green/black wire?

Surely in that mess of yours that isn't the only wire that doesn't go anywhere. Check the FSM or Haynes and see if they list that wire.

Try calling Howell and ask them why it keeps flooding. Maybe you got one of those bad chips everyone keeps mentioning.

1986 CJ7, Chevy 350, D44/D30, more to come shortly
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post #4 of (permalink) Old 10-25-2001, 09:42 PM Thread Starter
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Re: what is the sensor with the green/black wire?

I'm on the driver's side. It might be in the head, I have to take another look. I think it may be the knock sensor. I'm not sure.

1987 YJ 258 I6, NV 3550, TFI Upgrade, MSD 6A, TFX Exhaust, Smitty Sure Steps, Howell Fuel Injection 2.5" Rubicon Express Extreme Duty lift, 2" Body lift 1999 Cherokee Sport, Stock
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post #5 of (permalink) Old 10-25-2001, 09:57 PM
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Re: what is the sensor with the green/black wire?

i believe that the knock sensor is up front on the drivers side near the rad.

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post #6 of (permalink) Old 10-25-2001, 10:21 PM Thread Starter
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Re: what is the sensor with the green/black wire?

I just looked again. It is actually in the intake manifold on the drivers side closer to the firewall. The throttle cable runs right by it.

1987 YJ 258 I6, NV 3550, TFI Upgrade, MSD 6A, TFX Exhaust, Smitty Sure Steps, Howell Fuel Injection 2.5" Rubicon Express Extreme Duty lift, 2" Body lift 1999 Cherokee Sport, Stock
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post #7 of (permalink) Old 10-25-2001, 10:27 PM
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Re: what is the sensor with the green/black wire?

oxygen sensor?

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post #8 of (permalink) Old 10-25-2001, 10:51 PM
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Re: what is the sensor with the green/black wire?

the oxygen sensor is under the carb more or less in the middle of the engine.

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post #9 of (permalink) Old 10-25-2001, 11:43 PM
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Re: what is the sensor with the green/black wire?

That's the thermostat for the intake heater.
It's an electric heater under the carb. That helps vaporize the fuel mixture before the engine reaches temp.
It opens, turning off the heater at 160 degrees.


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post #10 of (permalink) Old 10-25-2001, 11:54 PM
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Re: what is the sensor with the green/black wire?

well if thats the case then i wonder why when i replaced it with a oxygen sensor, my emissions went down and it ran better?

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