taylorsk8

Can anyone tell me the cause of a popping sound at WOT. Seems to always be when the engine warms up, but when it is cold I don't really ever punch it so I don't know. I have a Edelbrock 1406 w electric choke. The choke does turn off all the way when warm. I have also noticed the idle is a bit high even though the throttle is back as far as the carb will allow and frequently idles high when warm. Any help is greatly appreciated since I am new to tuning carbs.

Thanks

T

gerry72

Your timing is probably too far advanced for your conditions.

LFZ

detonation man.....get that taken care of quick.

RobbSalzmann

If its a popping under the hood, and the idle is too fast, most likely timing too far advanced on the dist.

if is popping/cracking sound out of the tail pipes at WOT, then you are lean surging and may need to jet up the primaries/secondaries.

What does the exhaust smell like at idle? if you have the curb idle screw all the way out and it smells a bit rich, check that the secondary butterflies are closing enough, some carbs have an screw that will hold them slightly open.

gve

A worn cam lobe can cause it to pop thru the carb at WOT

Kid Vette

TJP440

Your high idle may be the clue, as in vacuum leak. You did'nt say whether it's popping out the carb or exhaust.
A worn cam lobe would be popping irregardless of engine temp. More info and we may be able to help

TimAT

Before HEI, points bouncing will cause it to pop too.

taylorsk8

To clearify, the popping is out the exhaust. I will do some checking with the information given.

Thanks
T

Jims66

Points, timing, bad plug wire, cam lobe, coil, fuel quality, jets too small (lean condition). JMO

larrywalk

Add tired valve springs to the list.

gingerbreadman1977

how did you go taylor? was it timing. that would have been my guess. dizzy prob spun about 10 degrees from hard launches. when it advances more then 10 you will get popping through the exhaust from start up and thats when you know you did a real good job laying rubber.