don't know what's wrong with my bike - Fuel pump, TPS, Valves?

eric.johnsson · Aug 9, 2024

My Husaberg FE 390 2012 got some problems out of nowhere. It has an uneven idle and dies during idle both warm and cold (have tried adjusting the idle speed but ), "boggs" when driving with a steady gas but runs okay during slow acceleration but "loses" power when given full gas. Just like the fuel doesn't go through or is blocked, then it dies sometimes when during downshifts but I can always start it up again without any problems.
Anyone that knows or thinks they know what the problem is and what the solution is?

eeazye · Aug 12, 2024

Does the FI light come on when it acts up? Other quick things to consider is the TPS (throttle position sensor) adjustment and functionality, fuel starvation (usual causes are small filter inline before fuel injector, or main pump in the tank, poor grounds, etc.

eric.johnsson · Aug 12, 2024

No, the FI light doesn't come up I will try to look into the TPS but I'm trying to find out what voltage it should have stock. The pump itself seems to do okay I'm starting to think it's the regulator or the filters.

Loend · Aug 26, 2024

If it has a seperate tuner that intercepts the fuel injector wires, try by passing it, and connect the stock fuel injection connector onto the fuel injector directly (like factory).

Berg4ever · Sep 4, 2024

Start simple: make sure you have good, fresh, 94 + octane gas. Don’t mix it with old crap!! Replace or remove the little in fuel line filter. Then question the in tank filter and/or pump. The pumps were known to go bad prematurely because of the extreme heat from the nearby exhaust.
- A 2011 390 guy.

don't know what's wrong with my bike - Fuel pump, TPS, Valves?

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