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Joe Bob's Avatar
 
Join Date: Jul 1999
Location: BOULDER Colorado
Posts: 39,412
Garage
Weber carb question.

My triple throat Webers on Franky sneeze and cough while at mid range cruise speed. They sound fine at idle and WOT.....

Any ideas?

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1983/3.6, backdate to long hood
2012 ML350 3.0 Turbo Diesel
Old 10-11-2004, 09:09 AM
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jpnovak's Avatar
 
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
Through intakes or exhaust? If its the intakes they are a bit lean. The transition range is 3-3.5K rpm for most setups. This means if your cruise speed is less than this you are in the idle circuit. Assuming you have cleaned all the passages and jets, Crack the offending cylinder idle adjustment screws 1/16 of a turn until it goes away.

If it pops through the exhaust, i suspect an exhuast leak or you are igniting unburned fuel in the hot exhaust. Some burble is expected on decel with carbs.

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Old 10-11-2004, 09:21 AM
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