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Air Cleaner - What is This? |
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DougS 
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Joined: 24-February-2019 Location: Ohio Status: Offline Points: 31 |
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 Topic: Air Cleaner - What is This?Posted: 27-August-2019 at 9:27AM |
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Hi All,
I have attached a picture of my air cleaner with this sensor that has a broken wire on it. Everything seems to be running well, but I am not sure what this is for, and if I should somehow reconnect the wire or just unplug it and not worry about it? This is on my 1975 Gran Torino Sport, 351M. Thanks. 
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gpd294
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Joined: 18-September-2008 Location: Dallas, Texas Status: Offline Points: 2180 |
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Posted: 27-August-2019 at 1:28PM |
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My wagon's 400 had this as well and I can only assume it is some sort of sensor, but when everything was re-done and re-built it was eliminated. I asked my mechanic to eliminate anything that wasn't absolutely necessary to keep her running, which meant all the smog stuff went too.
I know I wasn't any help, but I am interested what others have to say.  |
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Carlos....1975 Gran Torino Squire Station Wagon restored to look like a 1973 Torino Station
Wagon my Dad bought new from McAnary Ford on June 6, 1973 in Gary,Indiana |
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DougS
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Joined: 24-February-2019 Location: Ohio Status: Offline Points: 31 |
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Posted: 28-August-2019 at 6:46AM |
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Well, I have done some research on-line, and it seems this is a Distributor Ambient Temperature Switch. I guess it has to do with vacuum advance for the distributor. I found several different styles on E-Bay too, but not the exact one for my application. It must not be too critical of a part.
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72FordGTS
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GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5846 |
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Posted: 28-August-2019 at 12:17PM |
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You got it, it's a bi-metal contact switch. It's parte og the Cold Temperature Actuate Vacuum (CTAV) system. These switches were used on cars with the CTAV system along with the Thermactor system and catalytic convertors. Basically it controlled the vacuum advance depending on temperature. When the sensor was below 49 F, the distributor advance was directly from the spark port. Above 65 F, the vacuum advance was from the EGR port.
Like most of the emissions controls from this era, it's is archaic. If it were my car, it'd just steup the distributor advance direct to the carb. You may have to do some distributor tuning afterwards though.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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californiajohnny
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Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14609 |
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Posted: 28-August-2019 at 1:39PM |
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i remove all that nonsense junk
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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