Replacing spark plugs - Toyota Yaris Forums

flgLtd · 03-31-2015, 02:43 PM

That plug luoks real good for one with to many miles. Like Synthetic oil, it works real good till it causes a failure. Those plugs had a squared off electrode when new. Now the electrode is rounded. Metal ionizes off the electrode effectively reducing it's spark and eventually increasing gap. It will still work fine but working and working better than something else are different. When racing I found that all plugs work quite good when new. Most plugs are screwed up by 500-1000 miles of sheety city gas and air. Proven by running 500 mile plugs at the races. Change to something new and you can actually see your time go down...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
spark plugs	phenoyz	DIY / Maintenance / Service	48	01-18-2023 03:26 PM
Spark plugs for yaris RS 2zrfe engine	candy_red	Yaris TS Talk	3	11-16-2009 02:20 PM
article on spark plugs and the fit	kngrsll	Performance Modifications	4	08-02-2009 12:50 AM
did autolite spark plugs screw up coil or coils ??	la_scanner	DIY / Maintenance / Service	20	04-09-2009 03:07 PM
Upgraded Spark Plugs For Boost	whooppee777	Forced Induction Forum	9	02-14-2009 02:53 PM

03-31-2015, 02:43 PM	#1
flgLtd Drives: 09 Yaris Join Date: Mar 2015 Location: At my computer Posts: 4	That plug luoks real good for one with to many miles. Like Synthetic oil, it works real good till it causes a failure. Those plugs had a squared off electrode when new. Now the electrode is rounded. Metal ionizes off the electrode effectively reducing it's spark and eventually increasing gap. It will still work fine but working and working better than something else are different. When racing I found that all plugs work quite good when new. Most plugs are screwed up by 500-1000 miles of sheety city gas and air. Proven by running 500 mile plugs at the races. Change to something new and you can actually see your time go down...