[Shotimes] Slight Detonation Issue

[Ron Childs]

The PSPS code is Power Steering Presure Switch. You didn't turn the wheel
left & right during the test. Since you run premium gas, I might think
that maybe the detonation is caused by deposits on the pistons or valves
causing hot spots. Your engine is running at normal temperature, right?

-Ron Childs   '91

--- Josh Salaets <jsalaets@msn.com> wrote:
> 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!