It doesnt do it at idle, but when im cruising. It does this slight pop quite often. My dad said it is cuz the timing is off, and if it is when do I rotate the distributor clockwise or counterclockwise to fix it???
Fawkes said:Is it doing it under acceleration or deceleration?
Pakrat said:Are you still running points under the distributor? If so, your gap may be off and in need of re-adjusting.
65fastback2+2 said:well id think a burnt valve except both sides do it, and i doubt both heads have burnt valves, and like I said I i just had all new exhaust put on today so thats not it. timing or points are all i can figure from the info in this thread so far.
Ozsum67 said:How do you know it's from both sides? Did you have them put on an H pipe or some other crossover? New exhaust doesn't mean squat. Maybe you had a moron installer. Points mainly cause a miss, liike aplug was fouled. Not a pop. Timing too far out will pop and backfire through the carb. We really need more to go on here. Like a crystal ball.
mustangman1974 said:From what I have read its an ignition problem. check the Dwell. It shoudl stay pretty steady at all rpms. varying abotu 1 degree might be ok wiht points, but it really shouldn't vary. I would also get a vaccuum and compresson guage and do a compression test on each cylinder. Then use vaccum guage to check the valves. One thing for sure you can check is to put the vaccuum guage on full port vaccum and the needle should be stead with in vary with in 1-2 in.hg If it does you got other problems especially if the timing and dwell are correct.
TobyGaff said:The last car that I saw do this had the idle screws turned out too far on the carb. As you decelerate, it is allowing too much fuel into the engine. Turn your idle screws in 1/4 of a turn and see if it makes a difference, if not, turn them back out.