Millenia L V6-2.5L DOHC (1997)
Valve: All Technical Service Bulletins
Engine - MIL ON/ DTC's P0300 - P0306 Set
01-027/02
1995 - 2002 Millenia (KL engine) - MIL ILLUMINATION WITH DTC P0300 TO P0306
APPLICABLE MODEL(S)/VINs
All 1995 - 2002 Millenia models with 2.5L V6 (KL)
DESCRIPTION
After a cold start, MIL comes on with DTC P0300 to P0306 stored in the memory. In most cases, this concern may be caused by misfire occurring in one
cylinder during idle. The use of premium fuel (high-octane fuel) may be allowing carbon deposits to accumulate on the exhaust valve seat, causing
momentary insufficient compression.
To correct this concern, remove carbon deposits using a suitable top engine cleaner.
NOTE:
After removing the carbon deposits, be sure to advise the customer to use lower-octane fuel (87 or 89 octane) to help prevent future recurrences.
REPAIR PROCEDURE
1.
Warm up the engine until it reaches the normal operating temperature, then turn the ignition off.
2.
Locate the canister purge vacuum port into the intake manifold to feed the cleaner into the engine. This allows the cleaner to distribute evenly.
CAUTION:
^
Be sure to feed the "Top Engine Cleaner" into the engine through the correct vacuum port.
^
Do NOT use a PCV hose. If too much cleaner enters the engine, the engine may be damaged.
^
Do NOT use the vehicle vacuum hose. You have to prepare a new hose and fit an orifice (E5B6 13 986) into it to limit the suction rate.
^
With an orifice fitted into a new hose, about 7.5 fluid ounces will be fed into the engine, taking at least 1.5 minutes or longer. If the cleaner
is fed at a faster rate than 7.5 fluid ounces per 1.5 minutes, excess liquid entering the cylinders may cause hydrolock, resulting in engine
damage.
3.
Fit the other end of hose into the container of "Top Engine Cleaner".
4.
Choke off the hose with locking pliers (vise grips), then start the engine.
NOTE:
Large amounts of exhaust smoke will be emitted in the next step. Be sure to connect the exhaust evacuation hose to the tailpipe and ensure
there is adequate ventilation.
5.
While cycling the engine speed between 1500 and 3000 rpm:
a.
Remove the locking pliers from the hose with the orifice. The intake manifold vacuum will now draw the cleaner from the container.
