-
Welcome, Guest! We hope you enjoy the excellent technical knowledge, event information and discussions that the BMW MOA forum provides. Some forum content will be hidden from you if you remain logged out. If you want to view all content, please click the 'Log in' button above and enter your BMW MOA username and password. If you are not an MOA member, why not take the time to join the club, so you can enjoy posting on the forum, the BMW Owners News magazine, and all of the discounts and benefits the BMW MOA offers?
-
Beginning April 1st, and running through April 30th, there is a new 2024 BMW MOA Election discussion area within The Club section of the forum. Within this forum area is also a sticky post that provides the ground rules for participating in the Election forum area. Also, the candidates statements are provided. Please read before joining the conversation, because the rules are very specific to maintain civility.
The Election forum is here: Election Forum
High RPM vibration
- Thread starter Gregory
- Start date
Have you got an AF-XIED fuel management controller? Made a significant difference on my 1100.
https://www.beemerboneyard.com/bmwafo2sema.html
dieselyoda
Active member
Don't get bent out of shape chasing stuff.
Start at the basics, a bad plug will do the same thing, even a loose tension wire on the plug.
Your throttle body cable could have stretched a bit.
Bad load of fuel just once in the history of the bike could be plugging the filter in the injector and yes, your injectors have filters.
Start at the tune-up which includes battery cables and grounds, valve adjust, TPS adjust if required and a TB sync. Don't chase the perfect TB sync at idle. It's like trying to make a pig sing, you can do it but really, how often do you spend time listening to a pig sing? You spend more time at the 4K-5K RPM range, concentrate on a TB sync at that RPM.
Plugs, just change them and you don't need the BMW Farfumcheepin Spec'd. The Walmart Auto-lite works just as well at a fraction of the price.
A high speed miss is almost always a secondary ignition issue but if you want to change the HES, get a spreadsheet on the right coding plug and replace parts until your credit card is at the max, carry on.
Start at the basics, a bad plug will do the same thing, even a loose tension wire on the plug.
Your throttle body cable could have stretched a bit.
Bad load of fuel just once in the history of the bike could be plugging the filter in the injector and yes, your injectors have filters.
Start at the tune-up which includes battery cables and grounds, valve adjust, TPS adjust if required and a TB sync. Don't chase the perfect TB sync at idle. It's like trying to make a pig sing, you can do it but really, how often do you spend time listening to a pig sing? You spend more time at the 4K-5K RPM range, concentrate on a TB sync at that RPM.
Plugs, just change them and you don't need the BMW Farfumcheepin Spec'd. The Walmart Auto-lite works just as well at a fraction of the price.
A high speed miss is almost always a secondary ignition issue but if you want to change the HES, get a spreadsheet on the right coding plug and replace parts until your credit card is at the max, carry on.
Have a AF-XIED. Really made a performance difference. Thanks for the reply
Bike is tuned. Recently replaced plugs and wires. Valves are adjusted along with the throttle bodies. Battery is 2 yrs old. Around 2k miles on the tires. Checked the final drive for play. No metal bits in the final or trans. Replaced the HES about 20k ago. I have a set of old mercury Carb Stix that do a great job on the throttle bodies. going to recheck them again tho. You are right, Its going to take to take some detective work to figure this out. Thanks for the reply.
