Parts for your 2001 Toyota Hilux surf-Spark plugs

2001 Toyota Hilux Surf — Spark Plugs: Used on Petrol, Not on Diesel

According to Toyota’s technical literature for the 185-series Hilux Surf (Toyota Repair Manual and the Toyota Electronic Parts Catalogue for KZN185/RZN185/VZN185), the 2001 Hilux Surf was offered with both petrol and diesel engines. The petrol 3RZ-FE (2.7L) and 5VZ-FE (3.4L V6) use spark plugs. The diesel 1KZ-TE (3.0L turbo-diesel) does not use spark plugs, relying instead on glow plugs and compression ignition. So spark plugs are relevant if the vehicle is a petrol variant, and not relevant if it’s a diesel.

For diesel owners: spark plugs aren’t used because a diesel ignites fuel by very high compression and heat, not by a timed electrical spark. Toyota’s diesel service guides note the use of glow plugs solely to assist cold starts