I am replacing the vacuum lines on the 72 project 200 CI I bought recently. There is a block with 3 outlets on the intake manifold. One line was plugged. One goes to a tee which drops to the engine while the other direction goes to a switch on the drivers side and back out. Can someone run through all 3 lines please and tell me where each goes.
I have the 77 edition of the Petersons Big Book. It has fairly good information on the emission control systems, but a lot of information is needed to make an informed decision on your car. PCV SYSTEM Same as '70-71 cars. Crankcase mounted and connected to port at bottom of carb. Oil filler cap had crankcase closure hose going to air cleaner with a crankcase ventilation filter pack on the side of the air cleaner. DISTRIBUTOR VACUUM ADVANCE The '72 2000cc 4-cyl, 351C CJ 4bbl, and 460 4bbl had single diaphragm vacuum advance distributors, the other models had dual diaphragm vacuum advance distributors. What engine and distributor do you have? Distributor Control Systems DISTRIBUTOR VACUUM CONTROL VALVE (ECM and Solenoid Valve)(1971 version listed as follows Wiring would be as follows--Blue and Black wires to a Speed Sensor, Gray wire to a Thermal Switch, Red wire to ignition switch. Vacuum hoses---one from Valve to Air Bleed to Carburetor,,,One to top of 3-port PVS Valve(on Water Jacket) which has two more vacuum hoses which lead to---bottom port goes to vacuum port closest to the end of the vacuum advance on the distributor---middle port goes to tee, which in turn leads to the intake manifold vacuum connector and the vacuum port located nearest to the distributor body itself. Some cars also had a two wire ESC Temperature Switch mounted on the right door pillar and an ESC Speed Sensor in the passenger compartment. The ESC Vacuum-Control Valve[Distributor Modulator Valve] (with two vacuum ports) was located in different locations in the engine compartment depending upon the engine size. ELECTRONIC SPARK CONTROL (ECS) This looks like it would have been used with the single diaphragm distributor above, with the vac hose going from the single vac port (off of the distributor vacuum advance) to what the book calls a Distributor Modulator Valve (with 2 wires and 2 vacuum ports). The remaining vac hose on this valve went to the carb. Some cars also had a Transmission regulated Spark Control System. If you can tell me your engine and transmission(manual or auto), I can tell you if your car had that also. Hopefully, this information will help you decipher your vaccum system. I'm still trying to figure out my '74 Maverick with its 250. Someone just pull all the hoses and plugged them. It's hard to figure out what went where, as they also put an '80 Motorcraft carb with a '72 Mav Air Cleaner Assembly on it. So you know what I'm doing...
Additional note.. After I released my reply, I noticed you described the 200ci. Well, if the 200ci is with a manual trans, it has the Transmission Regulated Spark Control System. Automatic trans, no! Also, if it has the Electronic Spark Control (ECS), the electronic amplifiers are color coded based upon what their cut-in speed is--- Black-23 mph White-28 mph Blue-33mph Gray-35mph The way the amplifier works is-At 65*, the temp switch closes, cutting off vacuum to the distributor and retarding timing. As the car accelerates, the speed sensor transmits an electrical signal to the electronic amplifier. At the speced speed, the amplifier then de-energizes the distributor modulator valve to restore carb vacuum to the distributor. Then when the car decelerates to about 18mph, the amplifier stops the signal to the distributor modulator valve, shutting off vacuum and retarding the timing again. Guess I'm getting longwinded. If I expect help I think I should provide what I have or know, but time to stop...
!!!, i tried hooking it up by the instructions you gave and when i was through i had one vac. hose up my nose and one in my ear.... from my dealings with vac. is no matter how you hook it up "it still sucks" ...frank...
I agree, Vac "sucks" If someone needs it, I have the Petersons Big Book and the Chiltons Manual Emission Control Systems description and pictures. I would have to scan them somewhere and then e-mail them. Or, I can type them verbatim rather than try to summarize them as I did previously. Perhaps we should all get together and establish a Web encyclopedia of technical info on the Mavericks/Comets. The AMC list I belong to is trying to organize something like this. Would probably help a lot of folks and cut down on ebay traffic
