Question…Boxster S with 329,000 miles

[BYprodriver]

Originally Posted by shadrach74

Could you elaborate on this a bit. I'm new to Porsches but have a lot of experience with many types of machines, cars, motorcycles etc... I'm curious about the improvements to the FI and the failure mode of the plugs and O2 sensors in the early Boxsters. Also, how is the combustion event in a water cooled motor different then the combustion event in an air cooled motor?

In 2002 Boxsters went from single hole injectors to 4 hole, O2 sensors changed to the improved Bosch LSF, also non-return fuel supply. All this led to more accurate air/fuel ratio which makes plugs last longer. I was refering to how the air-cooled engines are a completely different design from the M96 engines requiring different service procedures.

[shadrach74]

Originally Posted by BYprodriver

In 2002 Boxsters went from single hole injectors to 4 hole, O2 sensors changed to the improved Bosch LSF, also non-return fuel supply. All this led to more accurate air/fuel ratio which makes plugs last longer. I was refering to how the air-cooled engines are a completely different design from the M96 engines requiring different service procedures.

The injector improvements you mention likely lead to better distribution through improved atomization of the fuel in the combustion chamber. Regarding spark plug life, the effects of these improvements are probably so small as to likely be irrelevant. The correct heat range and electrode material have a much larger effect on plug life.

[BYprodriver]

Originally Posted by shadrach74

The injector improvements you mention likely lead to better distribution through improved atomization of the fuel in the combustion chamber. Regarding spark plug life, the effects of these improvements are probably so small as to likely be irrelevant. The correct heat range and electrode material have a much larger effect on plug life.

Sparkplugs did not change, sparkplug life changed, so Porsche extended the recommended change interval. Keep in mind sparkplugs are cheap, gasoline is not, & neither is Porsche labor, but once the sparkplug is removed for inspection there is no abitional charge to reinstall new plugs. Also late model Porsches do not have magnetos