small sensor passenger side 1970 350 engine

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May 21, 2022 | 02:37 PM

jersphoto

Thread Starter

Instructor

Joined: Jul 2014

Posts: 148

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From: Lakeland Fl

small sensor passenger side 1970 350 engine

between the spark plugs I have a small electrical sensor with small black wire coming off it. It not coolant temp as that's on the other side. what is it for?

Sensor between spark plugs and my header pipes, Passenger side . what is it?

May 21, 2022 | 07:18 PM

PJO

Melting Slicks

Joined: May 2002

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From: Laporte, IN

TCS Cylinder temperature sensor part of the emissions system " Transmission Control Spark".

May 22, 2022 | 08:54 AM

derekderek

Race Director

Joined: Jul 2015

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From: SW Florida.

basically shuts off vacuum to advance until warmed up.

May 22, 2022 | 09:11 AM

jersphoto

Thread Starter

Instructor

Joined: Jul 2014

Posts: 148

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From: Lakeland Fl

Thanks for the fast response. Appreciate it.

May 22, 2022 | 09:35 AM

boat196

Burning Brakes

Joined: Aug 2007

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From: Green Valley Ca

There’s a solenoid valve attached to the intake manifold, that blocks vacuum to the vacuum advance. For a four speed, the vacuum passes through the solenoid valve when the transmission is in either third or fourth gear. The temperature sensor in your picture will allow vacuum to pass through the solenoid in the event the motor over heats.

May 22, 2022 | 10:07 AM

HeadsU.P.

Le Mans Master

Joined: Aug 2017

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From: Cool Northern Michigan

Its a 1970? Looks just like my '77. Brown wire lead.

I believe that IS a Coolant Sensor into that cyl head for the temp gauge.

I don't know what you have on the other side. Maybe someone switched sides or maybe oil press?
Either cyl head have ports for temp sensors.