| Author | Message | ||
     Buellx1w |
I just spent about 6 weeks working on my X-1 which would not start, and is now running better than ever. This is to provide advice to assist others in the same predicament (wont start, wont idle, breaks up at RPM, etc). I'm now officially a Buell EFI expert  .. 1. Beware of advice like *that happened to me and...* because it can send you off on all sorts of goose chases. I was looking at TPS, temp sensor, buying ECM spy, sending injectors off to Cali, etc etc, none of which were even related to my issue. 2. Instead of looking at *probable-causes*, I should have fallen back on my science background, and diagnosed the system. Unfortunately I didn't really know much about how EFI systems work- so here is a primer.. There are basically 2 sides to an EFI system. (1) is Fuel-supply. Unlike carburetor systems, EFI fuel supplies run at hi pressure. A Buell is about 50PSI, (regulated).. Side (2) is the delivery system- the injectors, electronic control of them, and the throttle-body. This system draws off the fuel-supply and provides metered, mixed, vaporized fuel to the cylinders. STEP 1- So you can reliably discover if you have a supply or a delivery issue very quickly. Remove the tank, rotate it 90 degrees giving access to the injectors and the rail (the metal part connecting the fuel line to the injectors). Leave the tank attached to the fuel pump wires, and leave the fuel line in place. Once done, loosen the hoseclamp and pull the line off the rail. If you're extra-careful, get a small can and put the line in the can, where you can still see the end. Turn the key (kill switch on). Two things should happen. 1. you should hear a whirrrr which is the pump running, and 2, fuel should spurt out of the disconnected line. Shut off the key. To be MORE accurate, you can get a fuel pressure gauge and attach it to the schrader valve on the tank petcock. About 50 PSI is where it should be. IF you have pressure, then you likely have a TPS or injector or possible a throttle body leak. If you DON'T have pressure, then you have a clogged filter, a bad fuel pump, or a bad fuel pressure regulator. In part II and III I'll explain how to diagnose the sections of each of the two fuel system components.  | ||
| 01x1buell |
1. Beware of advice like *that happened to me and...* because it can send you off on all sorts of goose chases. I was looking at TPS, temp sensor, buying ECM spy, sending injectors off to Cali, etc etc, none of which were even related to my issue. •••• you man, many have given you advice. | ||
| 01x1buell |
you are a •••••••. thats what i have to say |
