955i Starting Problem

My 955i had cracked coils, this could be your problem.Take it slow there will be more advice along soon.

 

Sounds like a faulty crankshaft position sensor (heat soak).
Does it start ok if you leave it for 20 minutes or so?
Check for fuel pump prime noise when switching on ignition. Multi meter check across CPS terminals of 600 ohms.

 

I'm just thinking out loud - Did you buy an OEM sensor, or an aftermarket replacement? If it isn't a Triumph sensor, there might be a calibration issue on your sensor that is still telling the ECM that something isn't right. However, if that was the case, I would expect to see another error code if it is serious enough to prevent the bike from starting. If other sensors are failing, including the Crankshaft Position Sensor, I would expect to see additional error codes. Have you tried to read the codes again?

This is going to sound like a 'stretch,' but have you thoroughly checked out your battery? Heat can be a problem for a battery. If your problem is only happening when the bike is hot and your battery is marginal, it may not be putting out enough amperage to start the bike. After it sits long enough, it may be gaining just enough power to start the bike. It's easy enough to check out the battery and rule it out before you start digging into harder things.

 

Greetings from France

I also own a 955i daytona from 1999, I have had this problem for a couple of years too, will start perfectly when cold but refuses to start on a regular basis after a 10/15 kms ride, did you come up with a solution in the end ?

 

On EFI cars a major cause of bad hot start is a failed ECU coolant temp sensor, the ECU will run the AFRs rich by default making hot starts very difficult, but fine when cold.