1971 help – what is this part?
Thread Starter
Le Mans Master
Joined: Feb 2004
Posts: 5,383
Likes: 11
From: Toronto Ontario
1971 help – what is this part?
I checked the AIM and even spoke to some vendors, we are not sure.
On my 1971 small block, on the passenger side shielding, there is a one
inch hole in the shielding with a wire going into the block.
What is this for and can you post a picture.
I want to replace the wire as the harness looks damaged.
Thanks
On my 1971 small block, on the passenger side shielding, there is a one
inch hole in the shielding with a wire going into the block.
What is this for and can you post a picture.
I want to replace the wire as the harness looks damaged.
Thanks
Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi 71,
I believe you're referring to the opening for the electrical connection for the temperature sensor that is part of the 71
Combined Emission Control (CEC) system.
Regards,
Alan
This is the sensor in the head the wire connects to.
I believe you're referring to the opening for the electrical connection for the temperature sensor that is part of the 71
Combined Emission Control (CEC) system.
Regards,
Alan
This is the sensor in the head the wire connects to.
Last edited by Alan 71; Aug 14, 2017 at 01:00 PM.
Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi 71,
The wire is actually a long pig tail that connects to a short lead that exits the engine harness around the rear of the right side valve cover.
Is that wire and connector still present in the engine harness?
Regards,
Alan
This is the lead and connector at the engine harness.
The wire is actually a long pig tail that connects to a short lead that exits the engine harness around the rear of the right side valve cover.
Is that wire and connector still present in the engine harness?
Regards,
Alan
This is the lead and connector at the engine harness.
Last edited by Alan 71; Aug 14, 2017 at 01:37 PM.
Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi Len,
I added a photo showing the lead coming out of the harness and it's length. It's 2"-3" ?
The pig tail is long.
Regards,
Alan
Try LectricLimited for the pigtail and the switch.
I added a photo showing the lead coming out of the harness and it's length. It's 2"-3" ?
The pig tail is long.
Regards,
Alan
Try LectricLimited for the pigtail and the switch.
Last edited by Alan 71; Aug 14, 2017 at 01:40 PM.
Thread Starter
Le Mans Master
Joined: Feb 2004
Posts: 5,383
Likes: 11
From: Toronto Ontario
we were wrong
Introduced in 1970, the Transmission Controlled Spark (T.C.S.) System controls exhaust emissions by eliminating vacuum advance in the lower forward gears while at operating temperature.
item # 663167 (the harness I was looking for) at Corvette Central
Introduced in 1970, the Transmission Controlled Spark (T.C.S.) System controls exhaust emissions by eliminating vacuum advance in the lower forward gears while at operating temperature.
item # 663167 (the harness I was looking for) at Corvette Central
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Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi 71,
The system used in 1971 was called the Combined Emission Control system. (CEC)
The Temperature Controlled Spark, (TCS) system was used in 1970 and 1972.
One of the differences in the hardware for the system was the placement of an electrically operated vacuum solenoid mounted on the right front of the carburetor.
Both systems required a temperature controlled switch… thus the sender in the right side cylinder head.
Regards,
Alan
The 71 CEC solenoid and bracket on the carburetor.
The system used in 1971 was called the Combined Emission Control system. (CEC)
The Temperature Controlled Spark, (TCS) system was used in 1970 and 1972.
One of the differences in the hardware for the system was the placement of an electrically operated vacuum solenoid mounted on the right front of the carburetor.
Both systems required a temperature controlled switch… thus the sender in the right side cylinder head.
Regards,
Alan
The 71 CEC solenoid and bracket on the carburetor.
Old Fart Pilot
Joined: Apr 2010
Posts: 1,932
Likes: 1,001
From: Spokane, WA
He's got the knowledge, photos of his very sweet '71, and willingness to help other Vette Heads out. Way to go Alan
Paul