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PostPosted: 15 Jan 2015 16:31 
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Joined: 13 Jul 2009 16:44
Posts: 31
Country: Trinidad and Tobago
Hi ,

Can anyone tell me how to test the knock sensor on a 1997 Mivec-Md 4G92 ? I did a scan and it said 31 knock sensor.....If i have to change it , how much torque is required for tightening the sensor?

Sean


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PostPosted: 25 Jan 2015 13:28 
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Mivec Guru

Joined: 04 Jul 2005 13:25
Posts: 1203
Location: Lower Hutt
Country: NZ
It depends on what sensor it is.
There's 2 completely different sorts used, seen them both.
The early one is the resonant type, it screws into the block. Torque isn't really critical so long as it's not loose and it's not so tight you break it.

The later one is the wideband one, it's really just a microphone. Got "Bosch" on it and it's got a hole in the middle for a bolt.

If you use the wrong sort, it won't work (won't pick up knock) and you'll end up with a broken engine.

You can test them both with an oscilloscope but the outputs are completely different.


You should really have "evoscan" or something similar to datalog it with, that's an easier way to test it.

Steve

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6G72 mivec Twin TDO5 20Gs up and running.
Scrapheap special making exactly 280 horses at some unknown rpm.
Engine dyno under construction.

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