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99-Boxster-MK:
This was on the PCA Tech Site:
"Porsche originally came out with bulletin number 8510 "Cleaning of Fuel Injectors" on December 6, 1985. This bulletin recommended adding 20 ounces of "Techron" to a full gas tank and refilling the tank at half empty with fresh gas. This should then be done 2 additional times. Your are not to use more than 20 ounces of "Techron" within 3000 miles. Then add the "Techron" to every 5th filling of the car.
Porsche still recommends that fuel injectors be cleaned similar to this with a high quality fuel injector cleaner. At the time when this came out many of the gas companies only put cleaners in their top of the line fuels. These lower octane fuels such as the 87 and 89 would start to gum up the injectors and valves fairly quickly. Although most of all the fuel grades have cleaners in them now we are faced with other problems. These being the tightening of the emissions controls of the automobiles. Any deviations in the combustion of the fuel will cause a response buy the DME. These responses can be the retardation of the timing, leaning of the fuel systems and other basic mapping characteristics. All of which means the loss of power. So always use a high grade gas and use a high quality fuel cleaner when used. Preventative maintenance is always better for you and your Porsche. Scott Slauson - PCA WebSite - 12/1/2004"
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