the EGR??????(1974 plymouth duster)?

Question

Where does it lead to? i have it on the intake manifold but its naked theres no hoses or anything on it there never was.. do i need it ?????and if so where does it go??? its been bothering me ever since i got my car last august

Answer 1

A ported vacuum hose goes to the egr valve diaphragm. There are two ports in the intake manifold that go internally to the egr valve mounting point. One goes to the exhaust passover passage in the intake, the other goes to the center of the intake manifold below the carburetor. When engine vacuum is high, the vacuum hose pulls the egr valve open and lets exhaust gas enter the intake manifold to lower NO emissions.

When it isn't hooked up and working it lets the engine pollute more and can make the engine ping with spark knock because the engine timing and fuel mixtures were designed to have the egr working.

Many cars have run for years with the egr not working without much consequence except polluting more. Your engine has a history of the intake manifold egr passages clogging up and not working.

If you have to pass an emission test it will prolly fail without the egr working.

Answer 2

Slant six or V-8???

matters not they work the same. The intake actually has a port connected to the exhaust ports on the head and the valve is controlled by vacum(under acceleration) and vents exhaust gases back into the intake. When you take your foot off the gas pedal it closes and stops the recirculation.

All done by springs inside and vacum from the little line that runs to the carburetor.

The ports on the head and intake manifold do plug up over time and have to be cleaned. We generally know this has happened when the choke stops working correctly and you get a real nasty dead spot(no power) in some range of the throttle travel.

Beth- under acceleration is the manifold vacum higher or lower? That is why the vacum comes from the carb which has variable sources and why most valves are tested with a vacum pump for operation.

ASE Cert Auto Tech, Yes from back in the 70's

Answer 3

Is it the fronts that lock, or the rears? Don't shim the master cyl with washers, that's f'in nuts. Theres an adjustable push rod between the pedal, and MC, if theres not enough clearance. There should be just a little. I will assume its the rears that lock. Is the rear jacked up? How do the brakes look, any fluid leaks? Pull back wheel cyl boots and make sure. Old mopars don't use a prop valve, the bias is in the master cyl. I'm going to take a wild guess here. The rear is jacked up and you have some fluid contamination on the lining, maybe even gear lube from a bad axle bearing seal. To help with too much rears a good tip:swap out the rear w cyls with late 70's mid' 80's truck w cyls, 7/8 inchers. That will tone down the rears abit for that fast drivin, hard brakin, pilotin solo mopar! Best of luck~Dan

Answer 4

What a classic! the egr valve covers a preheat exhaust passage under the carburator. When the EGR valve opens exhaust gasses are allowed into the intake manifold. Simple and pre heat air also opens the choke with the two metal tubes or just the bimetal spring on the manifold. Slant six or 340 cubic inch engine are slightly different. AND by the way Good Answer BETH!

Answer 5

As others have said, it is part of your emmissions system. Most were disconnected in older vehicles as they were prone to leak vacuum. Their function is to pass a little exhaust gases back to the cylinders and cool the combustion temperature to reduce Nox, a smog producer.

There should be a schematic under the hood or on a fender well showing the routing of the vacuum hoses to it. If it is gone, or worn away after all the years, ask at the dealer and they should copy one from an older Service Manual for you. We do it as a courtesy to customers for free at the dealer I work at.

Answer 6

The EGR valve was/is part of the anti pollution system. Most people disabled them. The car will run, you won't know it is disabled until you have to pass an inspection.

EGR stands for Exhaust Gas Recirculation. One of the many attemps to reduce emissions.

Answer 7

if you do not live in a smog state you dont need it. pull it out cover it with a plate and finish desmogging it. it is put on for those smog restricted states.

Answer 8

it may have went to a spacer plate on the carb that goes between the carb and the air cleaner

Answer 9

no you don't need it. It goes from the intake to the exhaust.