+- The CB1100 Community Forum (https://cb1100forum.net/forum)
+-- Forum: Honda CB1100 Discussions (https://cb1100forum.net/forum/forumdisplay.php?fid=5)
+--- Forum: Mechanical & Technical (https://cb1100forum.net/forum/forumdisplay.php?fid=7)
+--- Thread: CB1100 Idle speed instability problem (/showthread.php?tid=4140)
Pages:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
RE: CB1100 Idle speed instability problem - dave - 03-11-2021
I am not questioning that the IACV was sticking, and lubricating it cured the problem. I just want to share what I observed when I replaced my IACV: The original (defective) IACV did not show any signs of sticking in the aluminum throttle body assembly. There were no signs of galling, or abrasion, and there were no signs of any dirt or anything else that could have caused the IACV to stick. I performed side-by-side tests activating and deactivating the old and new IACVs side-by-side, and they both functioned identically. My conclusion is that the defective IACV that I replaced had an internal, intermittent short that came and went randomly. I applied a very light coat of grease to the new IACV and have never experienced the problem again. I would NEVER go through all the work to remove an IACV just to lubricate it and reinstall it if there was no hard evidence that it was sticking - once you have the old one out just replace it with a new one, unless you have nothing better to do with an entire day.
RE: CB1100 Idle speed instability problem - max - 03-12-2021
Just had an idea Dave, do you think it is possible that the brass center part of the piston is sintered?
Sintered bronze is porous, is used as bearings for starter motors and the pores can/should be filled with lubricant, what if some were not filled and made it off the assembly line and got used on some of the 2014 models?
RE: CB1100 Idle speed instability problem - dave - 03-13-2021
(03-12-2021, 05:13 AM)max_imp Wrote: Just had an idea Dave, do you think it is possible that the brass center part of the piston is sintered?
Sintered bronze is porous, is used as bearings for starter motors and the pores can/should be filled with lubricant, what if some were not filled and made it off the assembly line and got used on some of the 2014 models?
Hi Max. I saved my old IACV and just looked at it; the moving piston does not appear to be sintered. It has a very smooth surface, possibly polished. It doesn't look like it is brass, and I don't think it is chrome plated; it is non-magnetic. I would guess aluminum, but I think an aluminum surface would oxidize and not maintain this shine. It sure looks like steel, maybe stainless? What's your guess? I posted a picture of it somewhere in this post a couple of years ago and the color in that picture does give the impression that it is brass, but the picture is misleading.
RE: CB1100 Idle speed instability problem - max - 03-13-2021
Thanks for that info Dave, i was just brainstorming to see what the germans have done to repair their bikes.
Agree with the previous member who suggested to replace rather than clean the iacv after all the work to get it out, but just curious, cheers.
RE: CB1100 Idle speed instability problem - Enzofour_imp - 03-15-2021
Is it necessary to remap the ECU when replacing the IACV?
RE: CB1100 Idle speed instability problem - Lord Popgun - 03-15-2021
No. Replace it and it’s done.
RE: CB1100 Idle speed instability problem - Enzofour_imp - 03-18-2021
Eureka! IACV removed by removing only the airbox,
![[Image: 136a2afe578d63722a9582d599b9ab9b.jpg]](https://cb1100forum.net/forum/uploads/imp/202103/136a2afe578d63722a9582d599b9ab9b.jpg)
![[Image: 5069893af3f2cbfc7983f613eedb8708.jpg]](https://cb1100forum.net/forum/uploads/imp/202103/5069893af3f2cbfc7983f613eedb8708.jpg)
![[Image: 8c148cce171e20d512692ae828fc90c2.jpg]](https://cb1100forum.net/forum/uploads/imp/202103/8c148cce171e20d512692ae828fc90c2.jpg)
now I await the new IACV
RE: CB1100 Idle speed instability problem - peterbaron - 03-18-2021
Good job, Enzo
RE: CB1100 Idle speed instability problem - pdedse - 03-18-2021
(03-18-2021, 02:44 AM)Enzofour_imp Wrote: Eureka! IACV removed by removing only the airbox,
now I await the new IACV
Seems like such harmless little thing. Good luck with install on the new one when you get it.
RE: CB1100 Idle speed instability problem - GoldOxide_imp - 03-18-2021
(03-18-2021, 03:29 AM)pdedse_imp Wrote:(03-18-2021, 02:44 AM)Enzofour_imp Wrote: Eureka! IACV removed by removing only the airbox,
now I await the new IACV
Seems like such harmless little thing. Good luck with install on the new one when you get it.
Harmless? Looks like it should go into some orfice somewhere.Nevertheless, I hope it just works for you.