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Knock Sensor

 
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  #1 (permalink)  
Old 13 May 2011, 11:18 pm
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Join Date: Apr 2011
Posts: 11
Default Knock Sensor

Hello everyone!
So I've been getting my 2005 PT back in shape. I just replaced my windshield, camshaft sensor, a bad tire, changed the oil, and I now need to change out the knock sensor. Where is it located and is it pretty accessible via ramps? I've seen a couple pictures floating around the forum but nothing really definitive. Any help is greatly appreciated! Is it DIY-able?
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Old 13 May 2011, 11:34 pm
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Join Date: Nov 2007
Location: Mooresville, NC
Posts: 5,324
Default Re: Knock Sensor

I've never replaced one but the service manual makes it look fairly simple. Here's some snippets right from the 2005 manual:






And from the '05 parts catalog, I've highlighted the sensor:




Hope this helps.
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Old 14 May 2011, 12:49 am
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Join Date: Apr 2011
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Default Re: Knock Sensor

Thank you so much this is fantastic! Any idea on the torque? This is such a great forum, I'm writing up a seafoam tutorial so I can carry my weight around here lol
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Old 14 May 2011, 05:24 am
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Posts: 27,744
Default Re: Knock Sensor

Quote:
Originally Posted by dcsocal View Post
Any idea on the torque?
84 in-lbs, 10 Nm
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Old 08 Aug 2011, 10:11 pm
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Join Date: Aug 2011
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Default Re: Knock Sensor

Quote:
Originally Posted by dcsocal View Post
Hello everyone!
So I've been getting my 2005 PT back in shape. I just replaced my windshield, camshaft sensor, a bad tire, changed the oil, and I now need to change out the knock sensor. Where is it located and is it pretty accessible via ramps? I've seen a couple pictures floating around the forum but nothing really definitive. Any help is greatly appreciated! Is it DIY-able?
Make sure to use a torque wrench or tighten carefully.Ramps should allow easy access. Don't forget safety jack stands. OK
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Old 07 Aug 2013, 03:25 pm
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Join Date: Mar 2011
Location: Bexleyheath, Kent, UK
Posts: 170
Default Re: Knock Sensor

Hi dcsocal

I know this is an old post but I wondered why you decided to change the knock sensor. What symptoms did you have? My PT is pinking on hard acceleration or going up hill. In the UK we do not have different octane fuel so it must be an engine problem. For all I have read it sounds like the knock sensor is not sensing correctly and the engine timing is not being adjusted.

Thanks

Tony
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Old 07 Aug 2013, 03:36 pm
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Default Re: Knock Sensor

Quote:
Originally Posted by Jassy View Post
Hi dcsocal

I know this is an old post but I wondered why you decided to change the knock sensor. What symptoms did you have? My PT is pinking on hard acceleration or going up hill. In the UK we do not have different octane fuel so it must be an engine problem. For all I have read it sounds like the knock sensor is not sensing correctly and the engine timing is not being adjusted.

Thanks

Tony

Jassy,

Invest in a Ultra gauge. Then you can see what your timing and knock values among many other things are and can report data to help resolve your concern.

UltraGauge OBDII Scan tool & Information Center



Generally speaking if you knock senor was faulty you would be able to get a code through the OBDII Diagnostic port of P0325. The key dance may not bring this DTC value up and the need of a proper scan tool needed.

There is a test procedure but does require some experience to perform and a Digital volt/ohm meter.
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Old 08 Aug 2013, 03:53 pm
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Join Date: Mar 2011
Location: Bexleyheath, Kent, UK
Posts: 170
Default Re: Knock Sensor

Thanks NitroPT

I need to buy a decent OBDII scanner but the ultragauge is too expensive once I pay for international shipping and duty. Seems a scanner may prove my problem one way or another.

Tony
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Old 09 Aug 2013, 05:57 am
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Join Date: Jan 2013
Posts: 1,266
Default Re: Knock Sensor

Jass; I would change the knock sensor anyways to eliminate that possibility. Check wires and connectors first, though.
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