No knock, knock

[Bruce Plecan]

-----Original Message-----
From: Andrew F. Gunnesch <afgun at mongoose.dearborn.sgi.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, October 25, 1998 11:30 PM
Subject: Re: No knock, knock

Doing plug cuts.
Run the car till ya have a couple seconds of this noise, and cut the engine
release the load, neutral/clutch in.  Coast to a stop, and let things cool,
and
start pulling plugs.  If you see little black/silver flecks on the center
electrode
you have detonation.  Do this very carefully perferably on a limited access
area.  When ya kill the engine, no power steering, or power brakes.  This is
meant to be used on/for a race track.
  If it's bad enough you might have aome traces on them eithout the plug
cuts.
MIght get a plug magnifier, to really see what's going on.
Cheers
Bruce


>On Oct 23,  6:09pm, Bruce Plecan wrote:
>> -----Original Message-----
>> From: Andrew F. Gunnesch <afgun at mongoose.dearborn.sgi.com>
>> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>> Date: Friday, October 23, 1998 5:48 PM
>> Subject: Re: No knock, knock
>>
>>
>> >I have a '165 ECM for my TPI motor.  I believe that I'm getting knock,
but
>> >the knock sensor and/or ESC module not detecting it.  Anybody have some
>> >good diagnostics to determine this?  I've revved the snot out of it in
>> >neutral like someone suggested, but no knock shows up on my Diacom.  No
>> >codes stored either, so it doesn't think the knock sensor is bad...
>> >
>> What makes you beleive your getting knock?.
>> Nothing on diacom, and no codes, I'd think things were OK.
>
>I hear what appears to be knock when I'm getting on it over 4000 RPMs.
>There's not huge clouds of black smoke out the tailpipe like I get from
>my camaro when it pings, but there's a little, and it sure sounds like a
>coffee can full of marbles rattling until I back off.  ANy way to tell
>for sure?
>