02-19-2018, 11:12 AM
Re post 8, from post 5:
vacuum loss (minor = high idle, major = close to stalling/stalling)
TPS (FSM symptom/fail safe: hard to start cold)
IACV (FSM symptom/fail safe: engine stalls, hard to start, rough idle
EOT (FSM symptom/fail safe: poor acceleration)
DTC 29-1, FSM page 5-16, lists IACV circuit malfunction as "loose or poor contact of IACV connector, IACV or its circuit malfunction".
Otherwise, per the FSM, other sensors failsafe is normal engine operation, this includes MAP, IAT and O2. There is no mass flow sensor or exhaust temp sensor on the CB1100.
The FSM incudes all sensors on pages 5-15 and 5-16.
Symptoms reported are classic for IACV.
The piston not moving as much as the stepper steps would not likely provide a DTC (opinion) and this may be more likely than any other aspect of the IACV operation.
This would likely be from carbon build-up, perhaps induced by short trips, low speeds, and maybe even by high octane fuel (slower burn, less energy), and/or non tier one (highest level of cleaning additives) fuel, etc.
Dave's issue is not yet resolved, but if the IACV is replaced, with proper cleaning and wiring inspected, it is a highly likely fix...if the IACV piston travels freely within the port. When the IACV was replaced, without success, the throttle body port may have been an issue.
BTW, the IACV is not a simple solution, access is a pain...which is why the team has gone through the process of elimination.
vacuum loss (minor = high idle, major = close to stalling/stalling)
TPS (FSM symptom/fail safe: hard to start cold)
IACV (FSM symptom/fail safe: engine stalls, hard to start, rough idle
EOT (FSM symptom/fail safe: poor acceleration)
DTC 29-1, FSM page 5-16, lists IACV circuit malfunction as "loose or poor contact of IACV connector, IACV or its circuit malfunction".
Otherwise, per the FSM, other sensors failsafe is normal engine operation, this includes MAP, IAT and O2. There is no mass flow sensor or exhaust temp sensor on the CB1100.
The FSM incudes all sensors on pages 5-15 and 5-16.
Symptoms reported are classic for IACV.
The piston not moving as much as the stepper steps would not likely provide a DTC (opinion) and this may be more likely than any other aspect of the IACV operation.
This would likely be from carbon build-up, perhaps induced by short trips, low speeds, and maybe even by high octane fuel (slower burn, less energy), and/or non tier one (highest level of cleaning additives) fuel, etc.
Dave's issue is not yet resolved, but if the IACV is replaced, with proper cleaning and wiring inspected, it is a highly likely fix...if the IACV piston travels freely within the port. When the IACV was replaced, without success, the throttle body port may have been an issue.
BTW, the IACV is not a simple solution, access is a pain...which is why the team has gone through the process of elimination.