4. PRE-OPERATION CHECKS
16
E
Occasionally you may hear light “spark knock” or “pinging” (metallic rapping
noise) while operating under heavy loads. This is no cause for concern.
If spark knock or pinging occurs at a steady engine speed, under normal load,
change brands of gasoline. If spark knock or pinging persists, see your
servicing dealer.
NOTICE
Running the engine with persistent spark knock or pinging can cause engine
damage.
Running the engine with persistent spark knock or pinging is misuse, and the
warranty does not cover parts damaged by misuse.
OXYGENATED FUELS
Some conventional gasolines are being blended with alcohol or an ether
compound. These gasolines are collectively referred to as oxygenated fuels.
To meet clean air standards, some areas use oxygenated fuels to help reduce
emissions.
If you use an oxygenated fuel, be sure it is unleaded and meets the minimum
octane rating requirement.
Before using an oxygenated fuel, try to confirm the fuel's contents. Some
areas require this information to be posted on the pump.
The following are the approved percentages of oxygenates:
If you notice any undesirable operating symptoms, try another service station,
or switch to another brand of gasoline.
ETHANOL – – – (ethyl or grain alcohol) 10% by volume
You may use gasoline containing up to 10% ethanol by
volume. Gasoline containing ethanol may be marketed
under the name “Gasohol”.
MTBE – – – – – (Methyl Tertiary Butyl Ether) 15% by volume
You may use gasoline containing up to 15% MTBE by
volume.
METHANOL – – (methyl or wood alcohol) 5% by volume
You may use gasoline containing up to 5% methanol by
volume, as long as it also contains cosolvents and corrosion
inhibitors to protect the fuel system. Gasoline containing
more than 5% methanol by volume may cause starting and/
or performance problems. It may also damage metal, rubber,
and plastic parts of your fuel system.
HRX537HXE-HME.book Page 16 Friday, March 18, 2005 9:54 AM
