knock retard

[Joe Boucher]

I'm not much of a sparkie, so I tend to look for mechanical problems.

A while back, two seperate guys in the office complained about their GM trucks losing power
going up hill or into the wind.  Both were high mileage.  After pulling the plug on the
knock sensor, the problem went away.  No ping was heard.  They both went to higher octanes
for safety.  We think the engines had loosened up enough with mileage to the point the
knock sensor was interpreting engine noise as knocking.

Are you sure you don't have a small mechanical problem?  A noisy lifter, loose piston,
loose rod bearing?  Have you tried pulling the knock sensor wire?  This may set a trouble
code.  Found that out when I left mine off by mistake the other day.

Joe Boucher
'70 RS/SS Camaro  '81 TBI Suburban


> From: flying.monkey at juno.com (wayne johnson)
> Date: Wed, 23 Sep 1998 21:51:33 EDT
> Subject: knock retard
>
> Guys,
>  Can some of you help? I have just begun to log data with Diacom on a 89
> TPI vette and I'm seeing around 15 deg. retard at approx. 3500 RPM.
> Timing is set at 6 deg. BTDC and Chevron 93 octane gas is used. This
> seems like a lot of retard??
> The car does have dual pipes w/o cats, ADS off road prom, 160 deg.
> thermostat, opened air filter lid, K&N filter, TPIS airfoil and TPIS MAF
> sensor.
>  If anyone is interested in having a look I can send the diacom file. Any
> tips or things to look out for would be appreciated.
>
> Wayne Johnson
>
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