Guest tony78_280z Posted June 5, 2006 Share Posted June 5, 2006 What are possible causes of engine popping on the down throttle. I rev up motor and then quickly let off the throttle, and the motor pops a few times before reaching an idle, and a few times shortly after reaching idle. GM-350 w/ Holley 600cfm, Mild Cam and HEI. (more info on webpage) Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted June 5, 2006 Share Posted June 5, 2006 Running rich? Exhaust leak? Timing off? I think all of those things can cause it. Mario Quote Link to comment Share on other sites More sharing options...
iaconsultants Posted June 5, 2006 Share Posted June 5, 2006 Did you have a strong backfire or several smaller ones before this happened. It sounds a lot like your power valve in your Holley might have a leak. To check this you remove the float bowl (place paper towels under the float bowl to absorb the gas that will leak out) unscrew the power valve from the metering block and this sounds bad but place the flatter side to your mouth and apply a suction to it. If it holds the suction then it is good, if it slowly lets go or lets go quickly your powervalve is done. another thing is that your distributor cap may need to be replaced since it might have two much electrode decay, but it sounds more like the power valve. hope this helps. Robert Hope that helps. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted June 5, 2006 Share Posted June 5, 2006 Not enough timing will produce the symptoms you describe as well. Quote Link to comment Share on other sites More sharing options...
JaysZ Posted June 11, 2006 Share Posted June 11, 2006 is the actual motor popping or is it the exhaust? i had this problem when my carbs were running rich. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.