Knock Sensor Question
Thread Starter
Instructor
Joined: Mar 2003
Posts: 239
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From: Toronto Ontario
Knock Sensor Question
I read a post stating that the knock sensor can be by-passed by disconnecting
the battery and unpluging the knock sensor then plugging the battery back up
and leaving the knock sensor disconnected.Will this work on my 91 L98, will this leave a code and do I still need to put a resistor in series to ground?
the battery and unpluging the knock sensor then plugging the battery back up
and leaving the knock sensor disconnected.Will this work on my 91 L98, will this leave a code and do I still need to put a resistor in series to ground?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Knock Sensor Question (91superram)
The ECM will check the knock sensor after each startup by advancing timing till ping is detected.
With the sensor disconnected the ECM should throw a code.
With the sensor disconnected the ECM should throw a code.
Racer
Joined: Nov 2002
Posts: 471
Likes: 0
From: Queens NY
Re: Knock Sensor Question (65Z01)
I only get codes occasionally when I'm accelerating hard, once out of every 10 or 15 times I floor it, that' s it. I havent had the sensor on since I bought the car (9 months ago)
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Knock Sensor Question (91superram)
I don't see how you can bypass the knock sensor as it is a dynamic device.
If the ECM fails to see feedback when it tests the sensor it will set a code; if it sees constant knock feedback it will pull excessive timing.
If the ECM fails to see feedback when it tests the sensor it will set a code; if it sees constant knock feedback it will pull excessive timing.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Knock Sensor Question (CarAteMyMoney)
Running without the knock sensor is putting the engine at risk.
The connector is the same as the aux fan switch connector and either can be purchased with a wire attached for around $16 from Contemporary Corvette (link on my site).
The connector is the same as the aux fan switch connector and either can be purchased with a wire attached for around $16 from Contemporary Corvette (link on my site).
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Instructor
Joined: May 2003
Posts: 183
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From: San Jose CA
Re: Knock Sensor Question (91superram)
FYI the resistor method does not work. I've tried it. I even tried fooling the IAT sensor with a resistor and it didn't work. It does work on the water temp sensor though. The ECM looks for the specific frequency of knock for the specific engine. Putting in a resistor reduces the signal amplitude but does not have any effect on frequency. Believe me I learned a lot after I blew an engine by bypassing the knock sensor when I had a chip burned. :nopity :nopity :nopity Just being dumb.