The first thing to do is think about the fuel you put in, was it different then before? Also, one easy way to help it stop pinging is to put in the highest octane (92 or 93) you have around you. Also, check the timing, if it is too advanced, then it will ping. timing information is found at 240sx.org FAQ. If those things are fine, then move on to more complicated things.
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Adam
'89 coupe KA24DE+T
14.1 @ 104 MPH
'88 Celica All-Trac turbo
stock, but no more ecu codes!!
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