I was trying to imagine in my head what would make a pop sound at idle but wasnt sure. its a LB9 305, it idles fine and every here and there there is a random pop out the exhuast. maybe 1-3 per second. not very loud but louder than normal combustion. it doesnt seem to effect performance, but is this common? I think old plugs and wires might do this?

i dont think its the problem, but my y-pipe has rusted enough to seperate from the catalytic converter, the pipes still line up, but technically they are totally separated. some kinda backpressure stuff doing on possibly??

thanks

 

i would say the pop sound is just the massive exhaust leak from the ypipe not even being connected to the cat

 

could be an intermittent misfire.

 

when I had an odd poping sound out of my exhaust, it turned out to be a rocker that was loose and I guess wasnt opening or closing that paticular valve. I tighten it down and the pop went away.

 

 

the thing is is that it is random and doesn not follow any pattern, like every 8th pop is a loud one, its not like that. and again not real loud, but now that i think about it being a missfire that might make sense.

if a cylinder missfires and does not burn the gas in it, that gas will combust either when it is pushed out in the maniflods or at the next spark right, i guess that would make a sound like im hearing.

 

A few of my plugs got fouled this year causing a misfire. I also had that "pop" once in a while when it was idling.