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popping at idle

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General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 ·

#666218
G'day

I've been having fun with my recent venture into the wonderful world of Weber.

I've got a weber progressive on my 1800 motor now. Couldn't fault it, except the exhaust is popping a bit at idle.

What does this mean? Running too rich? Timing not adjusted right?

Incidentally what would the correct advance be for running PULP?

Just before my recent topend work I realised I was running it too far advanced for ULP (which is what I had in the tank at the time) and knocked it back to 2 or 3deg btdc. Just did it statcially because the engine was running so crap.

Since then it now has PULP in it and I feel that setting may be a little to far retarded?

Not sure if that would have anything to do with the idle issue though. Besides that seems to run great. There is popping on deceleration too but my guss on that was there is probably a small hole in the exhaust I have overlooked.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 ·

#666239
popping on deceleration can also be valves

Are you sure it is popping out the exhaust and not up through the carb??
If it is it is too lean at idle.

What are the jets in the primary circuit??
Futue te ipsum!!!

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 ·

#666241
Definitely popping through the exhaust.

I'll give it a tune in the next couple of days.
I have no idea what the jets are to be honest. Never looked. I just did a mad scarmble so I could have the van running again.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.