SELVA MARINE Blue Whale 250 EFI Service Manual page 365

Symptom 1: High engine idle speed (below 1,200 r/min)
Symptom 2
—
Symptom 1: Engine stalls, unstable engine idle speed, or poor acceleration
Symptom 2
Incorrect intake
cam timing
(check using the
YDIS)
6P23H11
Cause 1
Air leakage (throttle
valve-cylinder
head)
Cause 1
Variable camshaft Stuck
timing operation mal- valve plunger
function
Clogged oil control
valve filter
Clogged
sage
Stuck variable cam-
shaft timing
Troubleshooting the power unit
Cause 2 Checking step
Check the O-rings
and gaskets of the in-
— take manifold, surge
tank,
body.
Cause 2 Checking step
oil control Check the oil con-
trol valve operation
using the YDIS.
Check the oil con-
trol valve plunger.
Replace the oil con-
trol valve filter.
oil pas- Check the oil pas-
sage.
Replace the vari-
able camshaft tim-
ing.
Refer
to
page
4-12
4-15
and throttle
Refer
to
page
8-30
9-1
5-41
1-29
5-8
9-20
1
2
3
4
5
6
7
8
9