Still Coughing?
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Joined: Nov 2013
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From: jacksonville fl.
Still Coughing?
I have a 98 ultra EFI that has the dreaded and infamous "Kehin Cough". I was under the impression that EFI did away with that hideous malady, yet my ride suffers from frequently and occasionally to the point of stalling. I have been left for almost dead twice in the last few months when my baby coughed and stalled as I was starting to make a left hand turn at an intersection while oncoming traffic had no intention of stopping to let me restart and get out of their way. Worst part was it caused me to almost drop her right in the middle of the street.
She's a stock 80" evo with stage 1 air cleaner, aftermarket slip on mufflers and a power commander PC3-usb. Disconnected the PC3 and she still coughs like a chain smoker. Oh and throttle response is miserable as well. Any ideas on where to start? All of my bikes up to now were carbed models so I am flying uncharted waters here.
Any help is appreciated. Thanks
She's a stock 80" evo with stage 1 air cleaner, aftermarket slip on mufflers and a power commander PC3-usb. Disconnected the PC3 and she still coughs like a chain smoker. Oh and throttle response is miserable as well. Any ideas on where to start? All of my bikes up to now were carbed models so I am flying uncharted waters here.
Any help is appreciated. Thanks
Outstanding HDF Member
Joined: Jan 2011
Posts: 2,590
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From: Western Illinois, land of bad roads, and corrupt politicians
Intake seals. A buddy of mine pulled his, because his bike was running the way you describe, and one of them crumbled as he pulled it off the Y. It was a miracle that the thing ran at all. It was a 98 Evo Road Glide.
This is a picture he sent me of his seals.
This is a picture he sent me of his seals.
Last edited by shooter5074; Aug 14, 2014 at 03:54 PM.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
check the evo forum, the magnetti marelli efi was/is a mess. Some of the guys have converted to carb ( I love the keihin and it is easily modded for better power and mpg than the EFI) and some have mastered the MM EFI.
as above start with the basics, the off idle transition seems to be your problem.
if it is sneezing through the intake then look at:
lean mixture
too advanced ignition timing
intake valve not sealed- cam/lifter/pushrod/valve bent/ seat worn etc
mike
as above start with the basics, the off idle transition seems to be your problem.
if it is sneezing through the intake then look at:
lean mixture
too advanced ignition timing
intake valve not sealed- cam/lifter/pushrod/valve bent/ seat worn etc
mike
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,547
Likes: 7,153
From: Oxford, Nc
Just replaced my throttle position sensor last fall when mine did something like that. Fortunately Dealers still have analyzers (back then it was called the Scanalyzer,) that checks your sensors for you. Mine was $65 well spent to find it given that I was 400 miles from home. Might consider it.
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