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that 'Popping sound'....

FM Former Member
Can anyone give me some hints on this one? Stock Type 1 w/dual Kadrons & elec ignition - when cold I am getting a popping thru the exhaust. Mostly upon first 3-4 minutes on cold start aro 1500 rpm. More noticible on decel for first 10-15 min. Once warmed it is almost non detectable but still there. I have sync'd the carbs and adjusted mixture. Is it normal or if not, does it sound like carb or timing?
Thanks in advance for the feedback
uc Dale
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FM Former Member
Can anyone give me some hints on this one? Stock Type 1 w/dual Kadrons & elec ignition - when cold I am getting a popping thru the exhaust. Mostly upon first 3-4 minutes on cold start aro 1500 rpm. More noticible on decel for first 10-15 min. Once warmed it is almost non detectable but still there. I have sync'd the carbs and adjusted mixture. Is it normal or if not, does it sound like carb or timing?
Thanks in advance for the feedback
uc Dale
FM Former Member
Dale,
I bought my car around this time of year, and it was doing that when I first got it. On decel I was getting those little backfires, but once it was warm it would stop. After readjusting the carb the noise went away. Turns out the car was running a little rich. I don't know for sure that it is the same problem as your car, but it may be something to look into.
-mike
FM Former Member
This isn't a very technical fix but...I find that if I let the car idle for about one minute prior to starting off, it never makes the popping sounds. I do this even if I'm stopping for gas or whatever, I just find something to do for about a minute before I take off and I never have that problem anymore. But I will ask Kirk about it the next time I have it in for service.
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