OEM Volvo Spark Plugs on 850

[polara]

Why do non-turbo 850's use a tri-electrode spark plug while turbos use
a single electrode plug? What's the difference? Would there be any
advantage or reason to use the tri-electrode plugs on a turbo? Thanks

 

[volvowrench]

[email protected] by polara dropped his wrench, scratched his head
and mumbled,

Why do non-turbo 850's use a tri-electrode spark plug while turbos use
a single electrode plug? What's the difference? Would there be any
advantage or reason to use the tri-electrode plugs on a turbo? Thanks

The tri-electrode plugs helps defeat a problem that when cold starting,
moving the car, and shutting off provokes a hard or no start condition on
restart a few minutes after. The turbo motor uses a different heat range
plug, has a different fuel mapping for cold start and doesn't seem to
have the above problem.

No advantage that I know of.

Bob