I believe GW says premium fuel for their 2.3 engines. What are you running ? Pinging is never acceptable to me ...even when 'driving around it' as you describe. It comes down to timing advance or fuel octane or both. fwiw ...I tuned a GW 23. really carefully ( I generally make sure it's not too advanced at idle ) and it ran like gangbusters without any pinging on mid-gradefuel. I think yours is an 86 or later ..those use a defelctor shield.. 83's to 85's do not.
On 3/17/2013 8:32 AM, Steve Williams wrote: > Thanks, very interesting. > > At 11:18 PM 3/16/2013, Dennis Haynes wrote: >> ... the Cat and O2 sensor failing together is usually due to a common >> cause. > > Just to clarify, I don't know whether mine failed together. My O2 > sensor failed two years ago, right after passing smog. It's possible > the cat failed then, or anytime since. > >> There was a deflector shield that I bet is missing. > > Is that something I can look for? Photo? > >> Since you have a modified engine there is probably increased >> compression and you may also have the ignition timing over advanced. > > That could be. I have noticed what I think is some pinging in high > gear at full throttle going up a modest hill. That went away when > Van Cafe tuned the engine six months ago, but now it has returned, so > I must reduce throttle or gear down to prevent it. I don't know what > might change the advance over time, but it may be time to adjust it > again. > |
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