[cl] Knock Modules - LT1

[H Villemure]

Simply replace the plugs for one or even 2 ratings hotter units... do not let
the engine knock more than 5-6 sec. I destroyed a rod bearing doing a similar test.

I would very much like to know the basics of how a knock sensor works? I am
new to the list and also to microcontroller design at all. I have everything
to learn in this area!

Wronski wrote:
> 
> > module than the one that was installed in my PCM. So, I put that one in
> > first...just to see the difference. Wow! Huge difference. While I still
> > had knock retard...mostly at the shift points, it was only in for about
> > 2-4 data packets, and topped out at 10 degrees! So, it seemed I found
> > something...although I cannot quantify what changes were made between
> > the two modules I tested. Second, knowing that GM produced an LT1 with
> > roller rockers, and noisier cam drive (i.e. the LT4), I figured I would
> > give that a try...since I am sure GM knows what they are doing when they
> > tune these things. Again, the LT4 module was a completely different part
> > number. Well, I put this module in and guess what...NO knock retard at
> > all. Actually, when the motor is cold in open loop, I get a peak here
> > and there of about 8 degrees retard, but it only lasts for ONE data
> 
> Larry:
> 
> Congrats on the find.  I'm glad to see someone take a logical approach to
> finding and solving the problem instead of just disconnecting the knock sensor
> like so many people have done.
> 
> Just as a sanity check, it may not be a bad idea to try to force your car into
> a situation where it will ping to see if the new setup detects that.  Only
> thing I could think of would be to put in some of the crappiest gas you can
> find...unless you want to mix some oil in with the gas.
> 
>         -c

-- 
Helene V.
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