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CB1100 Idle speed instability problem
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736cc Offline
Running Like a Top

NY
Posts: 314
Joined: Aug 2013
Post: #671
RE: CB1100 Idle speed instability problem
When batteries are disconnected or replaced, standard operating procedure on 1st re-start is to allow the vehicle to idle until fully warmed up to allow all sensors to cycle. Connecting a battery, and throwing a cold car into drive going down the road immediately a definite no-no.
(This post was last modified: 01-04-2018 01:22 PM by 736cc.)
01-04-2018 01:21 PM
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SportsterDoc Offline
Running Like a Top

southern Nevada
Posts: 429
Joined: Nov 2017
Post: #672
RE: CB1100 Idle speed instability problem
(01-04-2018 01:21 PM)736cc Wrote:  When batteries are disconnected or replaced, standard operating procedure on 1st re-start is to allow the vehicle to idle until fully warmed up to allow all sensors to cycle. Connecting a battery, and throwing a cold car into drive going down the road immediately a definite no-no.

Not being facetious, but does it matter if the engine is still warm?

14 Honda CB1100 std
18 Yamaha XT250
16 Moto Guzzi V7II
17 Yamaha TW200
12 Triumph Bonneville
02 H-D Sportster 1200S
03 H-D Sportster XLH883
76 Honda CB750F
75 Honda CB360
70 Yamaha CT1
72 Yamaha CT2
72 Yamaha AT2
70 Honda SL350
70 Honda CL350
67 Honda CL160
67 Honda CB160
62 Honda CA110
01-07-2018 10:01 AM
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Dave Offline
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San Diego, ca
Posts: 411
Joined: Jan 2014
Post: #673
RE: CB1100 Idle speed instability problem
SportsterDoc may have just solved the high/low idle mystery! I checked the hose clamps on the throttle bodies today and all eight were loose! Two of them I turned the screws about three full revolutions before achieving an acceptable tightness! I rode the bike about 100 miles after tightening the clamps and it ran perfectly! Most of the miles were on the freeway, but I came to a full stop and put the bike in neutral no less than twenty times today, and each and every time it immediately returned to a perfect 1050 RPM idle! Before I can declare my idle issue is completely cured I must put more miles on the bike, and do some in town, slow speed, stop and go riding, and for a thorough test, I need to perform the in town riding in elevated temperatures. I will perform addition tests ASAP (hopefully next weekend), and report back. I urge any of you guys who are experiencing the idle problem to check your throttle body hose clamps, as SportsterDoc has been recommending.
01-07-2018 09:42 PM
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pdedse Online
Running Like a Top

Oregon
Posts: 668
Joined: Dec 2013
Post: #674
RE: CB1100 Idle speed instability problem
(01-07-2018 09:42 PM)Dave Wrote:  SportsterDoc may have just solved the high/low idle mystery! I checked the hose clamps on the throttle bodies today and all eight were loose! ... each and every time it immediately returned to a perfect 1050 RPM idle!...

Dave, that's awesome! Very happy for you!! Did you do the TPS disconnect and clean prior? Or just the tightening of the loose clamps?
01-07-2018 10:25 PM
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Guth Offline
Forum Founder

Portland, OR
Posts: 3,360
Joined: Apr 2013
Post: #675
RE: CB1100 Idle speed instability problem
(01-07-2018 09:42 PM)Dave Wrote:  SportsterDoc may have just solved the high/low idle mystery!

If this indeed proves to be the case, I might just have to pull an admin power move and change his user name to "CB1100Doc". Big Grin

2013 CB1100: Placed deposit on Nov. 12, 2012; Received delivery on April 5, 2013.
01-08-2018 12:38 AM
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max Online
1st Service Completed

auckland
Posts: 138
Joined: Sep 2017
Post: #676
RE: CB1100 Idle speed instability problem
That is a very interesting and useful find, Dave, thanks for keeping us posted.
max
01-08-2018 12:54 AM
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pdedse Online
Running Like a Top

Oregon
Posts: 668
Joined: Dec 2013
Post: #677
RE: CB1100 Idle speed instability problem
(01-08-2018 12:38 AM)Guth Wrote:  ...
If this indeed proves to be the case, I might just have to pull an admin power move and change his user name to "CB1100Doc". Big Grin

If this proves to be the case, you can pull another admin power move and change my user name to "CB1100sUkr" (having sold mine!). Haha...oh well.
01-08-2018 01:20 AM
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Houtman Offline
High Mileage

NC USA
Posts: 1,064
Joined: May 2013
Post: #678
RE: CB1100 Idle speed instability problem
(01-07-2018 09:42 PM)Dave Wrote:  SportsterDoc may have just solved the high/low idle mystery! I checked the hose clamps on the throttle bodies today and all eight were loose! Two of them I turned the screws about three full revolutions before achieving an acceptable tightness! I rode the bike about 100 miles after tightening the clamps and it ran perfectly! Most of the miles were on the freeway, but I came to a full stop and put the bike in neutral no less than twenty times today, and each and every time it immediately returned to a perfect 1050 RPM idle! Before I can declare my idle issue is completely cured I must put more miles on the bike, and do some in town, slow speed, stop and go riding, and for a thorough test, I need to perform the in town riding in elevated temperatures. I will perform addition tests ASAP (hopefully next weekend), and report back. I urge any of you guys who are experiencing the idle problem to check your throttle body hose clamps, as SportsterDoc has been recommending.
That is great news Dave , I know you probably would not like to do this but see if you loosen them again would the poor idle return ?
If you do this take a screw driver with you to tighten them while on the road after your "test"
01-08-2018 05:22 AM
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Dave Offline
Running Like a Top

San Diego, ca
Posts: 411
Joined: Jan 2014
Post: #679
RE: CB1100 Idle speed instability problem
Dave, that's awesome! Very happy for you!! Did you do the TPS disconnect and clean prior? Or just the tightening of the loose clamps?
[/quote]

Thanks pdedse. I wanted to change only one variable at a time, so I did not clean the TPS connection. However, because I had unplugged the TPS and reconnected the TPS just to see if the connection could be unplugged without removing the tank, I did perform the TPS reset. Hopefully unplugging and reconnecting the TPS was not the root cause.
01-08-2018 06:23 AM
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SportsterDoc Offline
Running Like a Top

southern Nevada
Posts: 429
Joined: Nov 2017
Post: #680
RE: CB1100 Idle speed instability problem
Dave, yours may be the only vacuum loss issue, but it is worth checking.

Also, more than one issue may be involved.

Enjoying the rain in Simi Valley, CA (visiting my 91 year old dad).
Hopefully mudslides will not interfere with return to Las Vegas, tomorrow.

14 Honda CB1100 std
18 Yamaha XT250
16 Moto Guzzi V7II
17 Yamaha TW200
12 Triumph Bonneville
02 H-D Sportster 1200S
03 H-D Sportster XLH883
76 Honda CB750F
75 Honda CB360
70 Yamaha CT1
72 Yamaha CT2
72 Yamaha AT2
70 Honda SL350
70 Honda CL350
67 Honda CL160
67 Honda CB160
62 Honda CA110
01-09-2018 08:24 AM
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