Prelude L4-1829cc 1800 ES,ET (1983)
CAUSE
Such a sudden loss of compression is usually caused by carbon holding the valves open.
CORRECTIVE ACTION
Use the following procedure to remove any "soft" carbon that could be stuck to or built up on the valves and seats.
1.
Remove the air cleaner cover. While someone cranks the engine, slowly pour an "upper cylinder solvent" (Gumout, GM Top Engine Cleaner, or
equivalent) into the carburetor. After several seconds of cranking, compression will improve and the engine should start.
CAUTION: Follow the safety precautions printed on the container.
2.
With the engine running, continue to slowly pour the contents of the can (1 pint) into the carburetor.
3.
Drive the car for several miles, accelerating the engine to 4000-5000 rpm in first and second gear.
To help prevent this from happening again, make the following recommendations to the owner:
^
Accelerate the engine to 4000-5000 rpm at least once each day the car is driven.
^
Use a high detergent, unleaded gasoline (a high detergent, low-lead gasoline is OK if the car has no catalytic converter).
