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This engine is equipped with the larger diameter VTEC spool valve so it’s the original design and thus, requires the ver.PR3 filters. Also, it is important to replace the bolts especially the short ones because they are exposed to the heat and moisture resulting in corrosion. Some owners broke these ...
Small contamination trapped at the VTEC spool valve filter. It’s the later spec one so the solenoid has smaller diameter (about 25mm) compared ...