kuhl@t4test.UUCP (Brain Kuhl) (02/02/85)
Does anyone out there know why a 305 chevy engine pings on
90 octane unleaded gas?It started after I gave it a tune-up
& rebuilt the carb.People tell me that it is running to lean
but I have not changed the jets.Could the float level be
causing this?
OTHER INFO:
pinging at the lower RPM's
same heat range plugs I think(no cross reference).
they were BOSCH now CHAMPION.
timing is set to speks.
Does anybody out there know the cure for this disturbing problem?
please reply
Brianmarkmo@tekig.UUCP (Mark Morland) (02/03/85)
-------- "Timing set to specs" is the problem. You simply have too much spark advance for YOUR engine's compression ratio and YOUR gaso- line. The ultimate cure might involve checking the centrifugal and vac- uum advance curves of your distributor, but the simplest, easiest, and most effective thing to do is retard the static timing. Mixture leaness usually shows itself with hesitation on throttle opening. -- Don't just sit there, DRIVE the damn thing! tektronix!tekig!markmo