Nulon Pro-Strength Upper Engine Cleaner helps restore engine performance, by efficiently removing carbon deposits, gums and varnish from air intake systems and combustion chambers without the need to dismantle the engine.

DIRECTIONS FOR USE:
DIRECTIONS FOR USE: Shake the can before use, warm up the engine
to normal operating temperature and for best results follow through
each of the following steps:
1. Throttle plate cleaning: Turn off engine and disconnect air intake duct from
throttle body. Spray sparingly onto the throttle plate, wipe throttle body gently
to remove excess liquid. Reconnect the air intake duct to the throttle body.
2. Inlet manifold and intake valve cleaning: Disconnect a vacuum hose from the
inlet manifold and start the engine. With the engine running at fast idle spray
approximately half of the can through the vacuum line using the spray tube
supplied. Then turn OFF the engine and leave to soak for 5 minutes.
3. If spark plugs are difficult to remove proceed to Step 4:
Piston crown cleaning: While the engine is still turned off, remove all spark
plugs. Spray a 2 second burst into each spark plug hole. Leave the engine to
stand for 5 minutes. NOTE: Before reinstalling the spark plugs, cover up the
spark plug holes with clean unused paper or cloth and crank the engine
several times. Reinstall spark plugs.
4. Final cleaning: Start the engine and disconnect a vacuum hose from the inlet
manifold before spraying the rest of the can into the vacuum line while revving
the engine. Reinstall the vacuum line and keep the engine running at fast idle
until all the remaining cleaner is purged from the exhaust system.
This treatment is recommended for every scheduled service.