[Shotimes] Slight Detonation Issue

[Josh Salaets]

Hey Everyone,

I have noticed lately my SHO is detonating ever so slightly at high rpms under
a heavy load, like climbing a steep hill.  I'm not really sure what the
problem is, but I'd like to track it down with all your help if I can.

The car has been run on nothing but premium from Chevron and Union 76 from the
time I bought it at 48K, the full 60K was performed right at 60K miles, and
the car only has 99,750 miles on it right now.  I have no "Check Engine" light
and the car runs great, but I did run the codes.  Here's what I came up with:

    KOEO:    111
    CONT:     211, 521
    KOER:    542

I know Code 542 is a common code that's no big deal, but what is a "211 - PIP
circuit failure" and a "521 - PSPS Circuit did not change states"?  Could
either of these codes be causing my detonation issue, or should I look
somewhere else?

Any info would be GREATLY appreciated!

Thanks in advance!

Josh Salaets
95 SHO MTX (See it at: www.cardomain.com/id/sh0gun)
85 Omni GLH-T (Yeah, it's fast)
NWSHOC Member
Aloha (Portland), OR