Engine Revolution Speed Fall Off.engine Stalls - TOHATSU MFS25 Service Manual

State 2 Full throttle engine revolution speed is low. Engine revolution speed fall off. Engine stalls. (Defective acceleration or deceleration)
Check battery cables for defective
contact, and ground lead wire
securing bolt for looseness or
disconnection.
Normal?
YES
Check throttle position sensor
and ISC valve connectors for
connections.
Normal?
YES
Check throttle valve for bend,
and shaft if it is seized.
Normal?
YES
Check compression pressure.
Normal?
YES
Check ignition system,
fuel system, lubrication
system and/or cooling
system.
25/30 2006
NO
Repair or replace
defective parts.
NO
Repair or replace
defective parts.
NO
Replace throttle body.
NO
Check valve clearance, or
disassemble engine and
check.
9
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