Popping sound in exhaust

dart_68 said

Update:

When I pulled and plugged the vCan that solved my popping problem. Motor runs pretty good and I got the idle down to 800 in neutral by turning the idle speed screw. I put a timing light on it and it was at 40* advanced. Wth? I'm wondering how it can idle that low and smooth with 40* initial advance? Is it possible that the dizzy pickup wires are reversed?

FYI, it has a Mopar distributor with HEI.

Click to expand...

The distributor pickup wires being reversed would not make the timing off, just erratic. (You adjust the timing based on when it actually fires.) But yes, if the damper ring slips you will read a more advanced timing on the damper versus timing cover marks than you actually have.

With that much ignition advance, the torque pulses are very strong so you can idle way down. Does not mean it is good.....Lord knows how much advance you had at idle with the v-can attached to manifold vacuum! LOL