Hi guys
New to this forum and need a little help
I've got a '67 Bronco with a stock 170...1100 carb and load a matic distributor
The idle is slightly rough, but barely perceptible. It does buck and surge when either accelerating or cruising.Vacuum is 17.5 and has a very slight needle wobble...less than an inch of vacuum. Timing is set a 6 degrees.
I've rebuilt the carb. When I did I noticed that the power valve was stuck open. I was able to lube it and get it to move freely. I changed rotor cap wires and plugs. I've installed a Petronix ignitor. The distributor diaphragm is working as it should. The old coil primary circuit was out of spec so I changed it out to a petronix 1.5 ohm unit I changed out the fuel pump and fuel tank....wanted larger capacity and the truck had varnish old gas in it so I changed the pump as a precaution. I installed a fuel regulator because the pump is putting out almost 9 psi.
This weekend I changed out the spark plugs again, warmed it up and drove it around the farm...still surging. Back at the shop I pulled the plugs..see pic . Plug 1 still looked new..insulator still white, plug 2 had a little color to it, plugs 3 and 4 were carbon fouled, plug 5 had a brown tone, plug 6 did as well but slightly lighter.
I'm going to do a compression check but was wondering if you all had any insight into this
Thanks
New to this forum and need a little help
I've got a '67 Bronco with a stock 170...1100 carb and load a matic distributor
The idle is slightly rough, but barely perceptible. It does buck and surge when either accelerating or cruising.Vacuum is 17.5 and has a very slight needle wobble...less than an inch of vacuum. Timing is set a 6 degrees.
I've rebuilt the carb. When I did I noticed that the power valve was stuck open. I was able to lube it and get it to move freely. I changed rotor cap wires and plugs. I've installed a Petronix ignitor. The distributor diaphragm is working as it should. The old coil primary circuit was out of spec so I changed it out to a petronix 1.5 ohm unit I changed out the fuel pump and fuel tank....wanted larger capacity and the truck had varnish old gas in it so I changed the pump as a precaution. I installed a fuel regulator because the pump is putting out almost 9 psi.
This weekend I changed out the spark plugs again, warmed it up and drove it around the farm...still surging. Back at the shop I pulled the plugs..see pic . Plug 1 still looked new..insulator still white, plug 2 had a little color to it, plugs 3 and 4 were carbon fouled, plug 5 had a brown tone, plug 6 did as well but slightly lighter.
I'm going to do a compression check but was wondering if you all had any insight into this
Thanks