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Hi
I have a Suzuki DF115 four stroke (1997) that is idling a bit high. I just installed a new tachometer and it is idling 900RPM, when it should be idling around 650RPM.
A mechanic just cleaned the IAC Valve and going by sound (since my tachometer was not working) it improved/decreased the idle alot, but still not quite there. The thermostat was replaced too since it was stuck open.
I found the calibration procedure (see below)
in the service manual. Does it sound like this is what I need to do now? Anyone know where the CTP switch is (or any other tips to perform this procedure)?
Thanks for any suggestions
ADJUSTMENT :
If idle speed is out of specification, perform following adjust-
ment procedure.
4. Check that CTP switch is in ON position.
5. To set the IAC valve duty to constant 15%, raise engine
speed to 1000 r/min. or higher by turning the by-pass air
screw and hold that speed for 10 seconds.
At this time, caution buzzer will sound to notify that IAC duty
is in fixed mode.
Turning air screw counterclockwise :
Engine speed will increase.
Turning air screw clockwise :
Engine speed will decrease.
NOTE:
• While IAC valve duty is at fixed 15%, caution buzzer will sound
for repeated 0.5 second with an interval of 3 seconds.
• The 15% fixed mode of IAC valve duty will continue for 5
minutes and then it will be automatically cancelled.
6. During fixed mode of IAC valve duty, adjust engine speed
to 625 ± 25 r/min. by turning by-pass air screw.
7. Open warm-up lever to turn CTP switch off.
NOTE:
The fixed mode of IAC valve duty can be manually cancelled
by turning CTP switch off.
8. Close warm-up lever and then recheck engine speed.
It should now be stable at 600 – 650 r/min.
NOTE:
Idling / trolling speed of 600 – 650 r/min. is controlled by IAC
(idle air control) system.
If engine speed does not return to specification, IAC passage
(including the IAC hose) may be clogged or IAC system may
not be operating correctly.
I have a Suzuki DF115 four stroke (1997) that is idling a bit high. I just installed a new tachometer and it is idling 900RPM, when it should be idling around 650RPM.
A mechanic just cleaned the IAC Valve and going by sound (since my tachometer was not working) it improved/decreased the idle alot, but still not quite there. The thermostat was replaced too since it was stuck open.
I found the calibration procedure (see below)
in the service manual. Does it sound like this is what I need to do now? Anyone know where the CTP switch is (or any other tips to perform this procedure)?
Thanks for any suggestions
ADJUSTMENT :
If idle speed is out of specification, perform following adjust-
ment procedure.
4. Check that CTP switch is in ON position.
5. To set the IAC valve duty to constant 15%, raise engine
speed to 1000 r/min. or higher by turning the by-pass air
screw and hold that speed for 10 seconds.
At this time, caution buzzer will sound to notify that IAC duty
is in fixed mode.
Turning air screw counterclockwise :
Engine speed will increase.
Turning air screw clockwise :
Engine speed will decrease.
NOTE:
• While IAC valve duty is at fixed 15%, caution buzzer will sound
for repeated 0.5 second with an interval of 3 seconds.
• The 15% fixed mode of IAC valve duty will continue for 5
minutes and then it will be automatically cancelled.
6. During fixed mode of IAC valve duty, adjust engine speed
to 625 ± 25 r/min. by turning by-pass air screw.
7. Open warm-up lever to turn CTP switch off.
NOTE:
The fixed mode of IAC valve duty can be manually cancelled
by turning CTP switch off.
8. Close warm-up lever and then recheck engine speed.
It should now be stable at 600 – 650 r/min.
NOTE:
Idling / trolling speed of 600 – 650 r/min. is controlled by IAC
(idle air control) system.
If engine speed does not return to specification, IAC passage
(including the IAC hose) may be clogged or IAC system may
not be operating correctly.