1 Flooding K100 Wed Mar 21, 2012 7:12 am
aquachrono23
active member
Hello, I have a problem w my '88 K100. Garaged it in December with no problems, bike was running ok . Now, the weather turned sunny and warm and I went & tried to start the bike. Battery is ok ( and recharged ) , fresh fuel and the bike starts, runs rough, won't idle, and dies. Then I cannot restart it because is flooded. If I disconnect the fuel pump and sender connector, it starts w the remaining pressurized fuel in the fuel rail then I have to reconnect the plug in order to maintain the bike running. Still won't idle , runs rough for a couple minutes after that is ok but still dies at idle with the choke on. And if dies, is flooded again , so no start only if I repeat the plug off / on procedure. I took the bike for a short run and it pulls strong , no hesitation. Clearly dies again if I let it idle. From time to time runs only in 2 cyl. always the same 1 and 3 so on different coils . Swapped the injectors and plug leads with no effect.
Things I checked:
- Vacuum leaks - found none
- vacuum hose at the FPR is ok
- cleaned all the plugs ( ecu, ign. module, ground etc )
- injectors spray pattern is ok ( pulled out the fuel rail still connected to the supply, return hoses and injectors plugs, and then cranked the the engine )
- measured the coils resistances, all seems ok
- measured the MAF output
- measured the fuel pressure - in spec.
- performed a leak down test and the results are between 20% and 26%
- verified hall sensors with led lamp, works ok
- I have bright strong spark at all 4 plugs
- injectors are energized
Things I replaced:
- new water temp sensor
- new set of plugs
- replaced the ECU with a spare
- replaced the ignition module
- air filter - new
The bike has 39 000 km.
And now I am out of ideas....what I am missing?? Any thought greatly appreciated . Thanks
Things I checked:
- Vacuum leaks - found none
- vacuum hose at the FPR is ok
- cleaned all the plugs ( ecu, ign. module, ground etc )
- injectors spray pattern is ok ( pulled out the fuel rail still connected to the supply, return hoses and injectors plugs, and then cranked the the engine )
- measured the coils resistances, all seems ok
- measured the MAF output
- measured the fuel pressure - in spec.
- performed a leak down test and the results are between 20% and 26%
- verified hall sensors with led lamp, works ok
- I have bright strong spark at all 4 plugs
- injectors are energized
Things I replaced:
- new water temp sensor
- new set of plugs
- replaced the ECU with a spare
- replaced the ignition module
- air filter - new
The bike has 39 000 km.
And now I am out of ideas....what I am missing?? Any thought greatly appreciated . Thanks