There are several ways to cure pre-ignition:
- Run higher octane fuel. Premium gas rated at 92 or 94 octane is best for an engine with a compression ratio between 9.25 and 10.25:1. ...
- Run the engine on the rich side. ...
- Try playing with ignition timing.
What causes pre-ignition?
Pre-ignition is the ignition of the air- fuel charge while the piston is still compressing the charge. The ignition source can be caused by a cracked spark plug tip, carbon or lead deposits in the combustion chamber, or a burned exhaust valve, anything that can act as a glow plug to ignite the charge prematurely.
What damage can pre-ignition cause?
This out of sequence combustion results in a tremen- dous load on the engine. Preignition creates excessive heat and substantial damage to the pistons, bearings, spark plugs and cylinders. Preignition is not easily detectable as it does not make an audible noise when it occurs.
