Distributor Modulator System at West Coast Classic Cougar :: The Definitive 1967

International Customers Click Here [Updated 1/2024]

UK Customers / EU Customers

We are using a new shipping service where international shipments now include the Duties/Tax/Fees, so currently we can not offer USPS/Mail Innovations if the order is over 135GBP/150EUR, since USPS can not pay duties/taxes. If the order is less than 135GBP/150EUR, we can pay the taxes directly to the EU/UK and we can ship USPS/Mail Innovations*. All orders over 135GBP/150EUR have to ship UPS/DHL so we can use DDP to cover the Duties/Tax/Fees. This has allowed us to resume shipments of any value to the UK and EU.

TIP: You will likely be able to ship your order for less cost if you ship any items over 135GBP/150EUR on one order via UPS, then break the rest of the order up into orders of less than 135GBP/150EUR.

By breaking your orders up into less than 135GBP/150EUR:

you will avoid the import duties on those orders
less expensive shipping methods are available
you will avoid some UPS fees

Canadian Customers

We have worked with UPS to waive some of the brokerage fees. The rates shown now include all UPS fees. We have also added DHL, which offers lower cross boarder fees.

Our shipping provider has added Duties Prepaid options for US Postal Service options to Canada. This has allowed us to resume USPS shipments to Canada.

However, beware that this is a new process for the Post Office, so sometimes Canada Post shows the duties and taxes COD, when they are actually prepaid. If this happens, first inform Canada Post that the shipment was sent duties prepaid (DDP). If they still require you to pay the duties before delivery, please contact us.

US Postal Service (USPS)

Our new international shipping system supports international shipments via USPS only if the order total (including shipping to most countries) is below the Duty/Tax De Minimis for your country (View De Minimis Chart).
Exceptions:
UK orders upto 135GBP
EU orders upto 150EUR

The US Postal Service (USPS) has suspended services to over a dozen countries (see complete list).
UPS Worldwide Services \ DHL Worldwide can still be delivered to these locations.

The purpose of the distributor modulator system was to help reduce carbon monoxide and hydrocarbons.

Distributor modulator system was standard equipment on some 1970 Ford Mercury Lincoln vehicles. We see it only on the 1970 Mercury Cougar and Ford Mustangs with the M code 351-4V Cleveland engine and FMX automatic transmission.

The purpose of the distributor modulator system was to help reduce carbon monoxide and hydrocarbons. Sometimes it is referred to as the Dist-o-vac system. The basic premise of the system was to use carburetor venturi vacuum to reduce engine emissions. This was performed by controlling distributor spark advance. A retarded spark provides hotter combustion chamber and exhaust manifold temperatures that cause more complete burning of the fuel.

The three main components are the Electronic Control Module, Speed Sensor, and Thermal Switch.

Electronic Control Module is the black box which houses the PC board and solenoid valve. Ford part D0AF-9E718-S, in the manual it is described as having a black box and a blue cover, we also see them with black covers on the black box.
*Side note – There is also a white colored box along with black, blue, and white covers. This combination of boxes and lids make for 6 differently identified units for a range of other applications.
Speed Sensor this actually is often confused with a cruise control part. It mounts inline on a two piece speedometer cable, it also has a two wire plug coming out of it. Ford part number D0AF-9E731-A.
Thermal Switch this measures temperatures and only engages the modulator system on, at temperatures above 58°F. Ford part number D0AF—12A164-B.

For a 1970 Mercury Cougar or Ford Mustang the black module box will 'cut in' at speeds of approximately 23 mph and 'cut out' when speeds fall below 18 mph, provided that ambient temperatures are about 58°F.

There is other related wiring and vacuum lines involved that we will try and include. There were also two similar systems on the 1972 Mercury Cougars. TRS Transmission Regulated Spark and ESC Electronic Spark Control are the names of the two systems. As time and information presents itself, we will include that system in the future.

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Modulation System - Ambient Temperature Switch - Used ~ 1970 Mercury Cougar / 1970 Ford Mustang

1970 Mercury Cougar
1970 Ford Mustang

Price: $43.88

1972 Mercury Cougar
1973 Mercury Cougar
1972 Ford Mustang
1973 Ford Mustang

1971 Mercury Cougar
1972 Mercury Cougar
1973 Mercury Cougar
1971 Ford Mustang
1972 Ford Mustang
1973 Ford Mustang