[Bartek]

I've got two knock sensors in my hands and after thorough checking I can't say if any of them is OK. I did everything like Bentley says. Voltmeter set to AC, tapping with some iron stuff. Not a volt or even milivolt. Perhaps my voltmeter is not so good because at VAC scale the smallest sensitivity is 200V which of course doesn't mean than any smaller can't be measured. What am I doing wrong? No continuity even for a moment. Both of them are dead? Or should I tap it in special way?

 

[nutcase]

I test mine by connecting them to the APC which I have a knock LED tuned in, then bash them with the handle of a large screwdriver. If the LED flickers, it's a goodun!

 

[alan forsyth]

if you plug it in and hit it the apc solenoid should chatter

 

[Bartek]

Allright. Hit it, then hit it once again

 

[Bartek]

Knock sensor works. Plugged to the wire and tapped - solenoid chatters. Still have some questions about solenoid. If KS is OK should it chatter from time to time almost with no breaks - I can hear it when pulling out or parking car. Solenoid can be heard at low RPM's (1000-1500) until I press brake pedal then stop. There's no reason to open solenoid cause there is no boost and there should be no knocking. Is it normal?

 

[Bennie]

Still have some questions about solenoid. If KS is OK should it chatter from time to time almost with no breaks - I can hear it when pulling out or parking car. Solenoid can be heard at low RPM's (1000-1500) until I press brake pedal then stop. There's no reason to open solenoid cause there is no boost and there should be no knocking. Is it normal?

wires, pressure sensor or APC broken.

GR, Bennie

 

[Bartek]

APC changed, pressure sensor gives exact 10 ohms at APC terminals (should be between 5 and 13 ohms).

 

[RoccoH]

Knock sensor works. Plugged to the wire and tapped - solenoid chatters. Still have some questions about solenoid. If KS is OK should it chatter from time to time almost with no breaks - I can hear it when pulling out or parking car. Solenoid can be heard at low RPM's (1000-1500) until I press brake pedal then stop. There's no reason to open solenoid cause there is no boost and there should be no knocking. Is it normal?

It could be your engine timing is a bit off and the engine is knocking in that rpm-range...

 

[Bartek]

OK. That's a clue. I'll try to swap for another solenoid and check if the other one is also chattering the same way.