I have a 2000 Ultra Classic. It is having mutiple issues. Ran great. Went out for lunch. When I tried to start to give home all these issues started.

high rough idle
backfiring
Tach not working
Check engine light on

I have did the following repairs to no avail
New spark plugs and wires
new gaskets and clamps on throttle body
new gaskets on air intake
New air filter
Tried to check codes. All banks say clr when in diagnostics

Any ideas would be helpful

 

well, what could have happened while you were at lunch? My first thought would be vandalism. Like maybe something in the fuel, or a cut wire. If i were in your shoes, I would remove the tank and wash it out, replace the fuel filter and look hard for any wires that could be easily accessed.

I hope I'm wrong. Good luck.

 

Fuel injected bike? If so the Marelli system that was used then is famous for intake leaks.

 

Did you get gas?

 

I replaced the gaskets and flanges. After installing also sprayed cleaner around while bike was running. No intake vacuum leaks.

 

yea earlier in the day. Ran a half tank through with no issues. Got more gas on the way home. Another half a tank ran through. Still rough.

 

If you have a crank position sensor in the front of the engine, unplug and reconnect. Or with that year the Crank position sensor maybe in the nose cone on the cam chain cover. Hopefully some with the knowledge of this CPS will chime in and walk you through the diagnostics. The CPS triggers the ignition circuit to fire the plugs.

 

Just replaced this also. Still to no avail

 

Have you tried some fuel system clearner? maybe a partially clogged injector? Maybe a new fuel filter?

 

if the check engine light is on, there is a malfunction detected by the ecm. On the earlier EFI models, the dealer can pull codes that won’t show on diagnostics from what I understand. Good luck on getting the problem resolved.