Hard to help without some important info..just sayin'
road king engine problems
Road Master
Joined: Mar 2008
Posts: 855
Likes: 1
From: Puyallup, WA
Might be fuel pump. I had a tiny hole in the fuel pump housing. When I was low on fuel It would suck in air in addition to fuel. Only happened when I was low on gas. Replaced and now all is fine.
Elite HDF Member
Joined: Oct 2006
Posts: 4,128
Likes: 27
From: florida swamp
snot, blood or tobacco juice?
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Novice
Joined: May 2011
Posts: 20
Likes: 0
From: Burnsville, WV
It's efi. And it doesn't do it everytime. I'm thinking maybe the fuel injectors or air cleaner?
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Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
More details, more helpful, cams, pipes, air cleaner mods etc.
is this like a "sneeze" or backfire through the carb?
if so:
1.) overly lean mixture - this can happen at a transition point in the programming, or indicate intake manifold leak, fuel delivery problem ( other than programming).
check intake manifold first, spraying wd40 ( messy) or water at connections to heads. if the idle picks up or changes, you have a leak
check programming by reinstalling stock air cleaner if high flow air cleaner is installed ( the fix would be to get programming sorted out to use hi flow)
2.) too advanced ignition timing ( unlikely if stock ignition system)
3.) cam timing off, bent stuck, leaking intake valve or pushrod or lifter allowing compression stroke to push back through to intake ( unlikely, but stuff does break- and would be worse at speed)
mike
is this like a "sneeze" or backfire through the carb?
if so:
1.) overly lean mixture - this can happen at a transition point in the programming, or indicate intake manifold leak, fuel delivery problem ( other than programming).
check intake manifold first, spraying wd40 ( messy) or water at connections to heads. if the idle picks up or changes, you have a leak
check programming by reinstalling stock air cleaner if high flow air cleaner is installed ( the fix would be to get programming sorted out to use hi flow)
2.) too advanced ignition timing ( unlikely if stock ignition system)
3.) cam timing off, bent stuck, leaking intake valve or pushrod or lifter allowing compression stroke to push back through to intake ( unlikely, but stuff does break- and would be worse at speed)
mike
Last edited by mkguitar; Sep 28, 2011 at 12:59 PM.
Road Captain
Joined: Dec 2010
Posts: 601
Likes: 0
From: Florida
