What would cause this - slow start when cold?
Discussion
Been having an issue with my Fireblade being very slow to start when cold. Fuel pump primes, battery has good voltage and the engine seems to turn over fast enough, but it takes a long time to fire. Then for the first few seconds it feels like it's bogging down, and after that is fine aside from a little hunting at idle. When riding it's pretty much perfect, and starting from hot is on the button.
I've replaced the fuel flow regulator, it's also had a full service fairly recently including valve clearances and injectors checked, and is running a Power Commander with the correct map. I do need to do the cam chain tensioner as you can hear that especially when cold, but any other ideas? Has air, has fuel, has spark - should go!!
Slow start;
Hunting a bit
I've replaced the fuel flow regulator, it's also had a full service fairly recently including valve clearances and injectors checked, and is running a Power Commander with the correct map. I do need to do the cam chain tensioner as you can hear that especially when cold, but any other ideas? Has air, has fuel, has spark - should go!!
Slow start;
Hunting a bit
Edited by Condi on Wednesday 7th October 17:24
Condi said:
trickywoo said:
It would be worth testing the air temperature sensor as it seems that the ecu might not be enriching the fuelling enough on cold starts.
Would that be a different reading to the thermostat temperature? The coolant gauge appears to be correct. Just to answer this in case anyone looks in future - the answer was dirty injectors. I used Seafoam which has done a great job, it's not cheap but after only 1/3rd of a tank it starts much much better and the idle is nicer as well. If I can get a good run out in dry weather in the next few weeks then will see what they're like once all the Seafoam has been through the engine, else over winter I'll get them serviced.
Gassing Station | Biker Banter | Top of Page | What's New | My Stuff