Testing the knock sensor
Testing the knock sensor
I think I need a new knock sensor, and they're insanely expensive brand new, so I'm going to pull one from a junkyard. I read something about an ohm test to see if they're good, but now I can't find that post, and I can't find anything in the manual. So how do you test a knock sensor to see if it's good?
KLZE-ed '94 RS/'92 GS hybrid -- It's complicated
-- Now somebody's winter beater
1999 Audi A4 2.8Q -- New ride
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1999 Audi A4 2.8Q -- New ride
- JWMX3
- Senior Member
- Posts: 2060
- Joined: March 23rd, 2004, 2:01 am
- Location: Grassie, Ontario
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Re: Testing the knock sensor
all you can do is a resistance check. Set the meter to ohms and one lead on the +12 one on the gnd in the knock connector.
I bought one brand new from the dealer, if i remember right it was 125.00 or something....
I cant remember what the resistance spec is for the knock sensor, i'll try to find it and post back or im sure someone else will in the meantime
EDIT *** in the mitchell manual it dosent give a resistance spec, but with the ign ON, should have 2.4 volts on the knock sensor. it also says to use a digital meter. hope that helps !
I bought one brand new from the dealer, if i remember right it was 125.00 or something....
I cant remember what the resistance spec is for the knock sensor, i'll try to find it and post back or im sure someone else will in the meantime
EDIT *** in the mitchell manual it dosent give a resistance spec, but with the ign ON, should have 2.4 volts on the knock sensor. it also says to use a digital meter. hope that helps !
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94' Mx3 GS 0-60 in 7.53s [5 spd conversion / Rebuilt 2.5 KL]
- Daveb
- Regular Member
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- Joined: April 12th, 2009, 12:32 pm
- Location: Eastern townships, qubec, canada
Re: Testing the knock sensor
I thought I read that the KLZE engine doesnt have a knock sensor, I m losing it.....
Something about putting a plate over the hole.....
I cant even find the knock sensor in my chilton book![Confused :?](./images/smilies/icon_confused.gif)
Something about putting a plate over the hole.....
I cant even find the knock sensor in my chilton book
![Confused :?](./images/smilies/icon_confused.gif)
1994 GS 5 speed 1.8, fresh black paint, flowmaster muffler & Little smelly pine tree
1993 RS 5 speed SOHC with 89,000 original KMs! (rising fast though).
1994 RS 4 cyl auto- running parts car with 104,000 KMs
1993 RS 5 speed SOHC with 89,000 original KMs! (rising fast though).
1994 RS 4 cyl auto- running parts car with 104,000 KMs
Re: Testing the knock sensor
You need to pull your intake and a coolant tube to access it. Why not post in the [WTB]. I'll have two by the end of the month. I'm sure others have spares as well. Cheers
2004 Subaru WRX Silver, stage 2, minty interior.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
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7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
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I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
- fieromx3
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Re: Testing the knock sensor
its 120 bux brand new at mazda.... and pretty much all knock sensors are out of spec these days... there is a guy here that had a faulty one in his mx6 so he went to the wreckers and tested all of them and all of them came out bad as there out of spec... so he went to mazda and bought a brand new one and it was right in spec!
spend the 120 bux for a brand new one. do it right. have a shiny new mazda part![Smile :)](./images/smilies/icon_smile.gif)
spend the 120 bux for a brand new one. do it right. have a shiny new mazda part
![Smile :)](./images/smilies/icon_smile.gif)
93' MX-3 GS-ZE
14.4 @ 96.7
14.5 @ 97.2
14.4 @ 96.7
14.5 @ 97.2
Re: Testing the knock sensor
Wonder if you even need it if you use high test gas?
2004 Subaru WRX Silver, stage 2, minty interior.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
- fieromx3
- Supporting Member
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- Joined: June 27th, 2005, 7:58 pm
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Re: Testing the knock sensor
without it ur ecu tends to go into limp mode.
93' MX-3 GS-ZE
14.4 @ 96.7
14.5 @ 97.2
14.4 @ 96.7
14.5 @ 97.2
Re: Testing the knock sensor
Limp mode ![Sad :(](./images/smilies/icon_sad.gif)
![Sad :(](./images/smilies/icon_sad.gif)
2004 Subaru WRX Silver, stage 2, minty interior.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
Re: Testing the knock sensor
fieromx3 wrote:its 120 bux brand new at mazda.... and pretty much all knock sensors are out of spec these days... there is a guy here that had a faulty one in his mx6 so he went to the wreckers and tested all of them and all of them came out bad as there out of spec... so he went to mazda and bought a brand new one and it was right in spec!
spend the 120 bux for a brand new one. do it right. have a shiny new mazda part
I remember reading something like that too, but I might as well try. So what's the resistance spec?
KLZE-ed '94 RS/'92 GS hybrid -- It's complicated
-- Now somebody's winter beater
1999 Audi A4 2.8Q -- New ride
![Laughing :lol:](./images/smilies/icon_lol.gif)
1999 Audi A4 2.8Q -- New ride
- mx3autozam
- Senior Member
- Posts: 2950
- Joined: September 24th, 2005, 9:09 pm
- Location: Kitchener
Re: Testing the knock sensor
520milliohms...anything else and and the sensor is screwed.
93 Mazda MX3 KLZE Turbo
Re: Testing the knock sensor
Do you know the margin of acceptable readings? (eg +- 30 milliohms or something)mx3autozam wrote:520milliohms...anything else and and the sensor is screwed.
KLZE-ed '94 RS/'92 GS hybrid -- It's complicated
-- Now somebody's winter beater
1999 Audi A4 2.8Q -- New ride
![Laughing :lol:](./images/smilies/icon_lol.gif)
1999 Audi A4 2.8Q -- New ride
- mx3autozam
- Senior Member
- Posts: 2950
- Joined: September 24th, 2005, 9:09 pm
- Location: Kitchener
Re: Testing the knock sensor
as far as I know if its not at that reading than its screwed. thats what someone told me
93 Mazda MX3 KLZE Turbo