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post #1 of (permalink) Old 11-30-2002, 12:13 PM Thread Starter
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need to ID a part on my 258 I6

could someone please tell me what the name of this part is called?
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post #2 of (permalink) Old 11-30-2002, 01:30 PM
 
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Re: need to ID a part on my 258 I6

The one with 2 or 3 vac ports is your CTO switch. That switch is used in conjunction with the EGR system. I couldn't tell what the other was.
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post #3 of (permalink) Old 11-30-2002, 02:25 PM
 
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Re: need to ID a part on my 258 I6

I can't tell what either of them are, but neither of them is the CTO switch. That's located on the intake manifold in front of the carb. This is the CTO:
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post #4 of (permalink) Old 11-30-2002, 09:02 PM
 
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Re: need to ID a part on my 258 I6

the one on the right could be the knock sensor the one on the left i have no clue [img]images/graemlins/tongue.gif[/img]
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post #5 of (permalink) Old 11-30-2002, 09:27 PM
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Re: need to ID a part on my 258 I6

That must be an older block. All of the later model blocks I have seen are plugged in those locations. The rear one looks like some sort of early CTO, I have no idea what the front one is. If you are rebuilding, or just trying to get the engine running again, I would pull them and plug them with some brass plugs. Both holes access the water jacket and you don't want them leaking. Later model intake manifolds had water running through them and also many of the coolant related sensors.

Later,
Tom
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post #6 of (permalink) Old 12-01-2002, 06:56 AM
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Re: need to ID a part on my 258 I6

The valve with two ports is the EGR CTO switch.

I had thought that the other was part of either the vapor recovery system or the thermostaticaly controlled air intake, but can't find any reference to it in the '78 FSM
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post #7 of (permalink) Old 12-01-2002, 09:28 AM Thread Starter
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Re: need to ID a part on my 258 I6

Thanks for the help. I was looking at an old vacuum diagram and it looks like the back one ran the q-tech transfer case.
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post #8 of (permalink) Old 12-01-2002, 10:27 AM
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Re: need to ID a part on my 258 I6

The one towards the rear of the engine is the Transmission Controlled Spark (TCS) System Coolant Temperature Override (CTO) Switch and should have 3 ports. The one towards the front of the engine is the Exhaust Gas Recirculation (EGR) System Coolant Temperature Override (CTO) Switch and should have 2 ports.
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post #9 of (permalink) Old 12-01-2002, 10:27 AM
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Re: need to ID a part on my 258 I6

I doubt that it has anything to do with a Quadratech TX. That valve was on my '78 with D20 TX.
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post #10 of (permalink) Old 12-01-2002, 09:47 PM
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Re: need to ID a part on my 258 I6

Might be a sender for an aftermarket water temp gauge.
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