Really weird ignition issue...
Hello,
This car is a 1972 Plymouth Duster:
Years ago, I swapped in 1979 360 from a van, later I swapped in a reproduction 340 cam from Mopar Performance. It has a Weiand 4 barrel intake and I had a Holley 600 4 barrel on it for most of the time I've had the car. Today I changed to an Edelbrock 750 since I had it here.
I changed the engine bay wiring to a 73-75 style so I could use electronic ignition with stock wiring. It uses all stock components.
I lined up the oil pump drive/intermediate shaft to point toward the forwardmost intake bolt as suggested by Rick Ehrenberg. Supposedly, this puts the distributor in the proper location.
With the engine timing set to 10 degrees BTDC, it idles great and runs well. When I try to connect the vacuum advance vacuum hose, the engine pops, sputters and runs so bad it stalls. Oddly, it does this whether attached to the ported or the manifold vacuum ports.
I did have Holleys on the car, both gave the same response with the vacuum line attached. I swapped on the Edelbrock and while it runs excellent at idle and under a load, if I attach the vacuum line it does the same thing as with the Holley carburetors. I can't even get a timing reading from it to see if it suddenly adds far too much timing.
One more thing....The vacuum advance cannister is touching the oil pressure sending unit. I have the "bell" shaped one on the car which is not correct since those are for cars with actual oil pressure gauges. I can't imagine that the wire terminal for the pressure switch could affect the distributor....is that even possible?
Hello,
This car is a 1972 Plymouth Duster:
Years ago, I swapped in 1979 360 from a van, later I swapped in a reproduction 340 cam from Mopar Performance. It has a Weiand 4 barrel intake and I had a Holley 600 4 barrel on it for most of the time I've had the car. Today I changed to an Edelbrock 750 since I had it here.
I changed the engine bay wiring to a 73-75 style so I could use electronic ignition with stock wiring. It uses all stock components.
I lined up the oil pump drive/intermediate shaft to point toward the forwardmost intake bolt as suggested by Rick Ehrenberg. Supposedly, this puts the distributor in the proper location.
With the engine timing set to 10 degrees BTDC, it idles great and runs well. When I try to connect the vacuum advance vacuum hose, the engine pops, sputters and runs so bad it stalls. Oddly, it does this whether attached to the ported or the manifold vacuum ports.
I did have Holleys on the car, both gave the same response with the vacuum line attached. I swapped on the Edelbrock and while it runs excellent at idle and under a load, if I attach the vacuum line it does the same thing as with the Holley carburetors. I can't even get a timing reading from it to see if it suddenly adds far too much timing.
One more thing....The vacuum advance cannister is touching the oil pressure sending unit. I have the "bell" shaped one on the car which is not correct since those are for cars with actual oil pressure gauges. I can't imagine that the wire terminal for the pressure switch could affect the distributor....is that even possible?