04 Suzuki DF 115 Idle problem

Panama Tom

Cadet
Joined
Dec 23, 2012
Messages
14
The fuel system had bad gas so I
changed all filters and fuel lines,
cleaned the VCM HP fuel pump, Pressure regulator, filter screen
checked all sensors all have correct voltage/ohms.
The Closed Throttle Position SWITCH is not responding to voltage ( Open circuit ) and I can't find a replacement.

The motor starts and immediately starts surging from 1K to 2.5k and while doing so it also backfires randomly. I ran a fuel pressure test both static and running, Static pressure when key on goes to around 38-40 then drops to 0. when the engine is running it stays around the same 38-40.

I have not checked the timing because it won't stay at a constant RPM
The engine also throws a Code 2-2 which is the CTP switch. Could the CTP switch cause the problem ?

Question What else can I check or adjust to get the proper idle?

Any help would be greatly appreciated,
Panama Tom
 
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