Originally Posted by bigtallguy
Sometimes, upon hard acceleration from about 3500-4000 rpm, I hear some pinging from the engine. What should I look for to try to fix this. If I accleerate from say 5000rpm it never happens, so is this just trying to get too much from too low rpms? I use 87 octane gas as recommended.
I think a lot of folks get hung up on using 87 octane. Suzuki's recommendation in the manual is:
FUEL, OIL AND ENGINE COOLANT RECOMMENDATION FUEL (FOR USA AND CANADA)
Use only unleaded gasoline of at least 87 pump octane (R + M /2 ) research method.
Gasoline containing MTBE (Methyl Tertiary Butyl Ether), less than 10 % ethanol, or less than 5 % methanol with appropriate cosolvents and corrosion inhibitor is permissible.
FUEL (FOR OTHER COUNTRIES)
Gasoline used should be graded 91 octane (Research Method) or higher. Unleaded gasoline is recommended.
Notice the "at least/or higher" bits. I'd use whatever makes that critter run the best and you might find that a higher octane blend will reduce your pinging symptoms. Other things that have helped in other vehicles are running a notch cooler spark plug, a notch cooler thermostat on the engine coolant, some have had success using engine cleaners to remove any built up carbon deposits, and one Dodge truck I've owned has issues with the routing and quality of the spark plug ignition wires.