12-05-2017, 01:19 AM
(12-04-2017, 05:07 PM)Cormanus_imp Wrote: SportsterDoc, see this thread, http://cb1100forum.com/forum/showthread.php?tid=11247
Thank you. Hopefully that saves reviewing the entire thread.
Thinking out loud:
1. Did not notice any checks for a vacuum leak
2. Not finding consistency in "cures"
3. Not all are low/high issues (may not be due to same cause)
I had a failure to idle issue on my V7II, first experienced at 8,000 feet altitude, ~5 months in service and 6,000 miles. It required throttle to maintain idle, even after returning to 2,200 feet elevation. Cured by tightening band around rubber from single throttle body to intake manifold.
However, it did it again, a couple weeks later in Arizona, on highway 89A going through Jerome (5,000 feet) after descending from a 7,000 foot summit. Continued to be an issue while giving grandkids rides around Clarkdale (~3,500 feet elevation)
Because of fueling issues starting cold or warm, I figured it was an ECU program issue...and the dealer had already downloaded what was supposed to be the latest program. Told my daughter that if Kingman Harley/Honda/etc. had a CB1100 I would trade it on the way home, as I did not want to deal further with the Las Vegas MG dealer.
Checked valves that evening and rode home the next morning, going back over Mingus Mountain. By the time I got to Chino Valley to refuel, idle was normal and stayed normal until I traded the bike. Took I40 instead of Route 66 and the Moto Guzzi ran strong at ~85 MPH for 80 miles to Kingman. Kingman did not have a CB1100.
(12-04-2017, 06:22 PM)max_imp Wrote: Data for Doc;
resistance of cold ( 20 celsius ) eot sensor 2093 ohms. engine starts and runs at 1500 rpm.
after 2 or so minutes the engine dropped to 1100 rpm and i switched it off to measure the resistance with a known accurate fluke digital multi meter and i have made a little connector which plugs into the eot sensor 1/8" spacing molex.
resistance at 1100 rpm. is 453 ohms and dropping ( temp still rising at that time )
this is a moving target as the engine is still transferring heat through the metal but much lower value is likely with a hot engine.
Resistance to engine chassis is infinity ohms ( the sensor floats electrically ).
Voltage takes a bit more work to do accurately.
Some observations; engine does not start with eot sensor disconnected and engine light comes on, it just stutters.
If the engine is started very quickly DURING the initialization phase ( when the meters are cycling ) the rpm's are initially higher and drop quickly to 1050, ( i've noticed this before and did not think it was important until now
this could mean that the iacv starts open and then moves to the desired setting of 1050 rpm.
Again; my cb1100 is from 2010 and does not have any issues.
cheers max
Max
That you for your post and the effort taken to provide the data.
I learned with H-D, 15 years ago, that it is best to let gauges fully cycle before starting. And that was with a carbed bike, no ECU, just an ignition module.
What I'm looking for are
1. EOT specs from the factory manual
Here is a link to a chart (see bottom) to serve as an example, but not likely the same scale: http://www.diesel-dave.com/vehic/manual/...118087.htm
2. Someone with on ongoing idle issue to test the EOT for resistance at various temperatures. This would best be done by removing the EOT and measuring resistance while varying the temperature. One way is to submerge the tip into water and slowly heating it while monitoring with a thermometer and ohmmeter connected.
This could help determine if an out of spec EOT is an issue or not.