Cascade Crew

[Sellmanb]

I did a minor rebuild to my q-jet. I took the 3 major pieces apart, cleaned all the carbon out of them, replaced a green plunger-like thing, and put new gaskets on. After I started it up, it idled at a nice RPM, and fairly steady, but I hear popping from the exhaust.

This is typical of a lean condition, correct? What did I mess up? lol.


Also, I made a set of plug wires with some MSD wires and boots, and I'm not completely sure if a couple of them are fully seated right now, but I doubt that would make the same sound, would it?


It does the popping a lot at idle and coming down from revving. It probably does it while revving as well, I just dont hear it as much.

[Twilightoptics]

naw, popping out the intake is a sign of a lean condition usually... because it gets hot and pre-ignites with the intake valve open.

[Dewey316]

But if the popping is out of the exaust, it could be exesivly rich, and the extra fuel is igniting in the exaust.

[NHRA427]

This may sound dumb but make sure 5 and 7 plug wires are right.

[Twilightoptics]

[Sellmanb]

It is more-so in the exhaust, I havent had problems with out the carb.

It actually only tends to do it right after I start it up. It does it once or twice (not bad, it just irritates me) and then smooth sailing from there.

I didnt adjust the idle mixture or anything. I did not move any adjustable parts, from what I know, they are all still set at the factory settings.

When I sniff the tailpipes they seem slightly rich at idle, but not excessively. I guess dyno will tell, eh ?


I checked 5 and 7 and they were correct. I made sure they were all clipped on all the way and I guess one of them was slightly off and now it idles a little smoother atleast, but it still does the popping once or twice thing.



Should I even be worried about this? I'm just afraid that over time it's gunna blow up the cat.

[Dewey316]