Is there a time element to spark plugs? Or strictly miles? - ZR-1 Net Registry Forums

ram_g · 08-02-2020

My recently acquired '91 now has 13K miles (driven ~250 miles in 4 weeks - probably more than in the last few years, lol). I have no reason to believe the plugs, injectors, etc. were ever replaced. The car drives fine and secondaries work (for now!).

My question is: should I replace the plugs proactively now, or wait till ~18-20K miles ("don't fix what isn't broken")? Do plugs "age" by themselves?

08-02-2020	#1
ram_g Join Date: Jun 2020 Location: Houston, TX Posts: 183	Is there a time element to spark plugs? Or strictly miles? My recently acquired '91 now has 13K miles (driven ~250 miles in 4 weeks - probably more than in the last few years, lol). I have no reason to believe the plugs, injectors, etc. were ever replaced. The car drives fine and secondaries work (for now!). My question is: should I replace the plugs proactively now, or wait till ~18-20K miles ("don't fix what isn't broken")? Do plugs "age" by themselves?