[Shotimes] Slight Detonation Issue

[Bruce Malachuk]

I seemed to be having detonation problems on my 94 when my LPM was
advancing the spark, even with premium gas. I had some decent deposits
on my valves, but after a week of soaking them in berrymans they were
all but gone. I plan to test to see if my detonation issues are gone
once I get back from TN on Friday and finally get my rod bearings
swapped out. Hopefully the deposits on the valves were what might have
been causing the problem, and they have been 95% removed.

Soaking the closed valves in berrymans did work, just took a long time
to break up alot of the carbon deposits. 

Bruce Malachuk

-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net] On Behalf Of Ron Childs
Sent: Tuesday, August 12, 2003 12:37 AM
To: Josh Salaets; SHOtimes
Subject: Re: [Shotimes] Slight Detonation Issue

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!
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