Bl1zzard
Well-Known Member
We decided to take my 74 Dart out to my sisters acreage for a BBQ. About 60 miles into the journey, I noticed that there was a rougher sound to the engine. We pulled into the nearest town and it wouldn't idle, I had to 2 foot it into a gas station. Did a quick check under the hood and couldn't see anything obvious. We limped it home and I've been troubleshooting it all morning. Here's what I found. I have good spark to all cylinders, pulled the valve covers and all the valves appear to be opening and closing without noise or clatter with the right amount of lift. Pulled the top off the carb and the bowls are clean with the right level of fuel. Pulled the distributor cap and it's nice and clean, no carbon or anything. I cranked up the idle speed and measured the heat on the exhaust headers and here's what I'm seeing.
1 - Firing
2 - Not firing
3 - Not firing
4 - Firing
5 - Not firing
6 - Firing
7 - Firing
8 - Not firing
Here's the spec's of the engine. 360LA with Edelbrock Performer 2176 Intake, Carter AFB 650CFM, MSD coil and plug wires, stock ignition, all stock bottom-end (maybe a purple cam according to the PO), stock fuel pump.
It seems to be directly related to fuel and the cylinders that aren't firing are all fed by one side of the dual plane manifold, could the carb have plugged up on one side somehow? It starts with a flick of the key, but it sounds like it wants to come apart at idle and really rough off idle. No backfires or valve noise.
1 - Firing
2 - Not firing
3 - Not firing
4 - Firing
5 - Not firing
6 - Firing
7 - Firing
8 - Not firing
Here's the spec's of the engine. 360LA with Edelbrock Performer 2176 Intake, Carter AFB 650CFM, MSD coil and plug wires, stock ignition, all stock bottom-end (maybe a purple cam according to the PO), stock fuel pump.
It seems to be directly related to fuel and the cylinders that aren't firing are all fed by one side of the dual plane manifold, could the carb have plugged up on one side somehow? It starts with a flick of the key, but it sounds like it wants to come apart at idle and really rough off idle. No backfires or valve noise.