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Jul 19, 2005 | 01:28 AM

hoosiervette

Thread Starter

Burning Brakes

Joined: May 2005

Posts: 945

Likes: 23

From: Uniondale IN

St. Jude Donor '14-'15-'16

what's this for

I found a 2 prong sending unit on the right head between the number 6 and 8 plugs. Nothing was plugged into it. I looked through my repair manual, but couldn't find anything. Anybody know what this is for?

Jul 19, 2005 | 01:31 AM

SkunkApe

Drifting

Joined: Apr 2005

Posts: 1,323

Likes: 3

From: I KNOW JESUS... HE'S MY GARDENER

I believe that's a temp sender for the smog controls (EGR?).

Jul 19, 2005 | 02:40 AM

Twin_Turbo

Race Director

Joined: Dec 1999

Posts: 16,945

Likes: 9

The temp sender is 1 prong, the 2 prong is the temp switch (switches to ground) for the auxilary electric cooling fan, I'm betting the connector fell off because it melted due to exhaust heat and it's somewhere down near the frame rail

Last edited by Twin_Turbo; Jul 19, 2005 at 10:04 AM.

Jul 19, 2005 | 02:42 AM

Bangkok Dean

Le Mans Master

Joined: Jan 2004

Posts: 8,295

Likes: 30

From: one night in Bangkok you are never lonely

I somehow knew TT whould know that

Jul 19, 2005 | 03:44 AM

hoosiervette

Thread Starter

Burning Brakes

Joined: May 2005

Posts: 945

Likes: 23

From: Uniondale IN

St. Jude Donor '14-'15-'16

whats this for

I don't have an aux fan. Yes I found the plug wrapped around the heater hoses. Can I just ignore this sending unit?

Jul 19, 2005 | 08:14 AM

Steve's74

Burning Brakes

Joined: Feb 2004

Posts: 958

Likes: 1

From: In the Beautiful Shenandoah Valley of VA

Quote:

Originally Posted by hoosiervette

Depending on the year, this could be the temperature switch for controlling the TCS (transmission controlled spark) system that Chevy used in the early 70s. It had two prongs. The switch provided vacuum timing advance in any gear if the engine began to overheat. My memory isn't great, but it may also have added or removed vacuum advance under other conditions as well. And yes, the connector probably melted off.

Steve

Jul 19, 2005 | 08:26 AM

gerry72

Safety Car

Joined: Aug 2000

Posts: 3,711

Likes: 43

From: San Antonio TX

Quote:

Originally Posted by Steve's74

Your memory isn't too far off. What the TCS did is to block vacuum advance until high gear while the engine was cold. The retarded timing made the engine warm up faster. Crude, but effective.

Jul 19, 2005 | 08:39 AM

RC73

Pro

Joined: Aug 2003

Posts: 702

Likes: 1

From: Houston TX.

Quote:

Originally Posted by Steve's74

Depending on the year, this could be the temperature switch for controlling the TCS (transmission controlled spark) system that Chevy used in the early 70s. .

Steve

Kinda what I was think, need to know the year of the engine. Not all years had the same acc.