1 1990 K75S no start Mon Aug 13, 2018 9:31 pm
Jim H
New member
Hi
The bike had sit for 5 years and I decided to start riding again (long story). It was working when I put it away. I decided to change out the tank guts with ethanol resistant parts. That all when fine. Now it won't start. Symptoms include flooded wet with gas plugs on cranking. It might fire and run on one, then two then all cylinders but won't idle Then after it warms above 2k rpm it will run on choke and then finally idle. It will restart immediately but won't after sitting for 30 minutes.
Have done a lot of testing. Fuel pump and regulator working and putting out ~37 psi during cranking. It has spark on all three plugs and plugs have been replaced. The injectors can be heard clicking away with a stethoscope and their resistance in 16 ohm each. I built a lamp system and hooked each injector lead up to it. All flash when cranking. The air flow meter (AFM) checks out per Bert Vogels tome on the subject. http://k-bike-knowledge.000webhostapp.com/electrical/EFI/bike-wont-start-EN.htm
The coolant temperature sensor is reading 8300 ohms at the computer connector (pin 10-13)and the online number says it is supposed to be ~2500 ohms at RT.
I removed the connector from the from the coolant T sensor today and measured the sensor resistance there at 4100 ohms. No corrosion, clean. When connect it the reading at the computer is 8300 ohms. There seems to be something wrong there. What else does the coolant sensor connect to? How do we get the resistance at the computer back to 2500 ohms? One diagram I looked at showed it didn't connect to anything. Another showed it connected to the temperature switching unit. The diagram shows the sensor body is grounded the the pipe to which it connects I haven't checked that yet.
Finally would such high sensor reading at the computer allow for the flooding problem discussed?
Any help would be appreciated.
Thx,
Jim
The bike had sit for 5 years and I decided to start riding again (long story). It was working when I put it away. I decided to change out the tank guts with ethanol resistant parts. That all when fine. Now it won't start. Symptoms include flooded wet with gas plugs on cranking. It might fire and run on one, then two then all cylinders but won't idle Then after it warms above 2k rpm it will run on choke and then finally idle. It will restart immediately but won't after sitting for 30 minutes.
Have done a lot of testing. Fuel pump and regulator working and putting out ~37 psi during cranking. It has spark on all three plugs and plugs have been replaced. The injectors can be heard clicking away with a stethoscope and their resistance in 16 ohm each. I built a lamp system and hooked each injector lead up to it. All flash when cranking. The air flow meter (AFM) checks out per Bert Vogels tome on the subject. http://k-bike-knowledge.000webhostapp.com/electrical/EFI/bike-wont-start-EN.htm
The coolant temperature sensor is reading 8300 ohms at the computer connector (pin 10-13)and the online number says it is supposed to be ~2500 ohms at RT.
I removed the connector from the from the coolant T sensor today and measured the sensor resistance there at 4100 ohms. No corrosion, clean. When connect it the reading at the computer is 8300 ohms. There seems to be something wrong there. What else does the coolant sensor connect to? How do we get the resistance at the computer back to 2500 ohms? One diagram I looked at showed it didn't connect to anything. Another showed it connected to the temperature switching unit. The diagram shows the sensor body is grounded the the pipe to which it connects I haven't checked that yet.
Finally would such high sensor reading at the computer allow for the flooding problem discussed?
Any help would be appreciated.
Thx,
Jim