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Pop pop pop...pop...pop that's the sound I hear
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i_luv_my_bus76
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Joined: May 18, 2012
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Location: High Desert
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PostPosted: Tue Oct 30, 2018 7:00 pm    Post subject: Pop pop pop...pop...pop that's the sound I hear Reply with quote

Stock 2000cc type 4 engine, 1.8 heads, dual webers...in a bus

I rebuilt the webers and put them back on, I got the engine started and tried.balancing the carbs...

I use a flow meter. When I got the flow/idle set then adjusted the mixture if I wrap.the throttle real quick then engine responds as it should but when the idle should come back to normal it drops down low and struggles to stay idling...or it comes back to idle but has a low deep popping noise, like fuel igniting in the exhaust.

Anyone have any troubleshooting steps or theories on what it might be[/b]
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Vanillagurilla
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Joined: November 21, 2017
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PostPosted: Wed Oct 31, 2018 3:12 am    Post subject: Re: Pop pop pop...pop...pop that's the sound I hear Reply with quote

Idle mixture screws.
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mikedjames
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PostPosted: Wed Oct 31, 2018 6:22 am    Post subject: Re: Pop pop pop...pop...pop that's the sound I hear Reply with quote

Float level
Dirt in the fuel metering valves.
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Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
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volksworld
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PostPosted: Wed Oct 31, 2018 6:32 am    Post subject: Re: Pop pop pop...pop...pop that's the sound I hear Reply with quote

idle too lean on whichever cylinder is popping
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udidwht
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Joined: March 06, 2005
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Location: Seattle, WA./ HB, Ca./ Shizuoka, Japan
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PostPosted: Wed Oct 31, 2018 1:30 pm    Post subject: Re: Pop pop pop...pop...pop that's the sound I hear Reply with quote

Check fuel pressure. No more than 3.5 max
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