Easy Knock sensor test

[Bruce Plecan]

-----Original Message-----
From: Thomas Martin <marttj at pcmail1.csg.mot.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, October 28, 1998 5:54 PM
Subject: Re: Easy Knock sensor test


Oh I'd really like a copy of that!!.  I'd even pay S+H on e-mailing it,
HOHOHAHA.
Seriously thou that would be interesting reading
Cheers
Bruce     nacelp at bright.net


>My 1980 Turbo Trans AM knock sensor test is to rev the engine to 1800 rpm,
>and rap on the intake, the rpm should drop about 200 rpm for a few seconds,
>and then return.
>
>I have at home GM specs on the knock sensors for the 4, 6 and 8 cyl GM
>cars/trucks from the past 15 years, they all are designed around specific
>frequency's.
>
>I can send the data for the sensors and part numbers if anyone is
>interested.
>
>Basically, use the correct sensor for you type of engine if you are adding
>knock sensing.
>
>Thomas Martin
>
>
>
>am018 wrote:
>
>> Last night I hooked up Lucas Efi  knock sensor  (Bosch type ?) to my  PC
>> scope to measure the output --  I saw 750mv peaks. It occured to me that
>> this is the around same level as a Lambda sensor output   -- so I
>> connected my LM3914 based LED Lambda output indicator (which is powered
>> from dry cell not the vehicle battery) to it and turned up the led
>> brightness -- tap the block and and the first two lights illuminate for
>> an instant and the third flickers  slightly.   A very quick and easy
>> test much easier than hooking up a scope.
>>
>> Andy
>
>