Testing knock sensor

The Devils Own Chariot

The Devils Own Chariot

Active member
I get KR under boost, then under decel. Never at idle. I know running really rich can cause KR. And I am running rich. Still working on tuning that out. I tried testing the knock sensor by hitting the DP, block and exhaust manifold. I can not trip the knock sensor. Im running code59 and tuner pro shows no KR when I do the "hitting test." Why can I not activate the sensor? Has anyone seen this?
 
E

Eric Sy GN

Donating Member
Re: Testing knock sensor

There is an RPM limit under which no knock retard will happen. I don't have the info in front of me, but I think it's around 750rpm in the stock chip.
So in order to test it, get the car idling, prop the throttle open a tad to get the RPM up, then knock on the block.

Eric
 
SyTyAddict

SyTyAddict

Member
Re: Testing knock sensor

You might try having the engine off with the key on, then tap the block with a hammer. I'm not sure about this, but I think it wont show kr without the engine running, but the knock counts should increase when you tap it. I believe that's how I did it a while back.
 
Beavis

Beavis

Still plays with trucks
Re: Testing knock sensor

If on stock chip, let truck idle and tap alt with a small hammer. You should see the counts go up on datamaster, not sure on TPro.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: Testing knock sensor

If someone doesn't chime in then I'll look when I get home. It might be a flag setting/constant...
 
The Devils Own Chariot

The Devils Own Chariot

Active member
Re: Testing knock sensor

Well I tried the new bin with the "ESC Cutoff for ESC retard" to 0. I still can not get the knock sensor to trigger. It shows readings when Im driving but does not show readings at low RPMs or just turning the ECM on with the key. I even had the knock sensor backed out on the hole and kept it plugged in. I tapped it on the block. Still nothing. I tried Datamaster also. Still not able to trigger it. Is this a sure sign that the knock sensor is bad or is there another table that needs to be adjusted in code59
 
WyoSyclone

WyoSyclone

Active member
Re: Testing knock sensor

Under 'constants' try turning KESCDLY, KBKRTIM, and KKBKRTPS all to zero, then see if you can get KR by tapping on the engine. Tap on it with a wrench because the knock sensors are built to listen to only a certain frequency range.

Don't forget to set those values back when you get done :D
 
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