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Thread: AU II Knock Sensor

  1. #1
    Experienced Member Jim Tudge's Avatar
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    Default AU II Knock Sensor

    I saw a post somewhere and someone was asking where the knock sensor is on an AU Falcon.
    Well, my diagnostic reader showed I had a faulty knock sensor the other day so I pulled it out and gave it a clean including the connectors and cleared the code to see if the problem re-surfaces.

    I took a few very amateur shots using my Iphone while in the pit. I hope they are some use to someone.

    KS-circled.jpgKS-close-up1.jpgKS-close-up2.jpgUnder-manifold.jpg

    The photo with the circles shows the knock sensor in place & circled in yellow with the connectors circled in red. The nut that holds the knock sensor on should be fairly tight.

    In the other "underneath" photo I have labelled a few parts to make it easier to find. The knock sensor is under the No.5 intake runner towards the rear of the engine. If you clean the connector, it is also worthwhile cleaning the connector for the main engine loom at the rear of the motor too. You need to undo one bolt on the cap to get inside and spray with an electrical cleaning agent and it takes a couple of minutes all up
    Last edited by Jim Tudge; 05-08-2012 at 05:32 PM. Reason: grammar

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    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    A week after removing & cleaning the knock sensor, I checked for fault codes & the knock sensor fault code had returned. So, I disconnected the main wiring loom connector next to the fuel pressure regulator & gave it a spray with Electa-Clean. I put it back together, cleared the code & checked it again last weekend only to find the fault code had returned yet again.
    I also found the fuel economy is down - 730km off 80 litres, nowhere near as goood as it used to be. The ute has less pickup than it used to. So, rather than risk buying one on-line for $144.20, I went to REPCO today & got a new Knock Sensor for $170 including discount for being an RAC member. I'll replace it on the weekend & report back if performance & economy improves at all.

    new_knock_sensor.jpg

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    Default Re: AU II Knock Sensor

    Quote Originally Posted by Jim Tudge View Post
    A week after removing & cleaning the knock sensor, I checked for fault codes & the knock sensor fault code had returned. So, I disconnected the main wiring loom connector next to the fuel pressure regulator & gave it a spray with Electa-Clean. I put it back together, cleared the code & checked it again last weekend only to find the fault code had returned yet again.
    I also found the fuel economy is down - 730km off 80 litres, nowhere near as goood as it used to be. The ute has less pickup than it used to. So, rather than risk buying one on-line for $144.20, I went to REPCO today & got a new Knock Sensor for $170 including discount for being an RAC member. I'll replace it on the weekend & report back if performance & economy improves at all.
    new_knock_sensor.jpg
    It will be interesting if the new knock sensor improves your fuel economy as it does effect the timing of the engine....let us know how it went.

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    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    I installed the new knock sensor yesterday. I am hoping the original was faulty and that is the end of it. Only time will tell. I installed the new one and then cleared the fault code (P0325).
    I will report back again in a week or so if the economy has improved. I need to take it for a good drive. Next on my list is to pull the injectors and give them a clean in my brother's ultrasonic cleaner. The ute has driven 412,000km so it won't hurt to do them.

    Here's a few before & after shots of yesterday's half hour job from the pit at my folk's place. First photo is of the old Knock Sensor in place, then the engine stud without the knock sensor & finally a shot with the new knock sensor in place.

    old_KS.jpg KS_Stud.jpg new_KS.jpg
    Last edited by Jim Tudge; 26-08-2012 at 10:30 AM.



  5. #5
    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    I said in my last post that I hoped that the problem was gone. Well, after replacing the knock sensor and clearing the codes the problem is once again being reported by the ECU (P0325). So I might have a cabling issue or perhaps a connector is faulty, I hope it is not the ECU. I will have to employ my multimeter and get down and dirty. Oh the joys of motoring.

    I am open to suggestions if anyone has insight to these faults and what else can cause the 4.0 I6 engine to display this code.
    Last edited by Jim Tudge; 01-09-2012 at 12:51 PM.

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    Default Re: AU II Knock Sensor

    Knock sensor colour wires are two Yellow/Red wire to pins 32 & 57 of the ECU, going by diagram it should be straight loom from knock sensor to ECU

    Pin 32 should read 0v ign on & 0.2v with engine running.
    Pin 57 should read 0.2v when ign on or engine running.
    Last edited by PD56; 01-09-2012 at 01:58 PM.

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    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    I thought it best to come back and provide an update on this issue. I disconnected the cable from the knock sensor about 6 weeks ago and sprayed it with a cleaning agent. I also checked the main wiring loom connector near the fuel regulator again and gave that a clean. The fault codes haven't returned after checking them a few minutes ago (20th October 2012) with my diagnostic reader.

    No news on the economy yet but I will do an economy run sooner or later and report back.

  8. #8
    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    Fault codes haven't returned still so the knock sensor replacement seems good (check with diagnostic reader yesterday). Power is definately improved, the car is much more responsive. However, economy is only marginally improved at around 8.8km/litre around town (mostly during peak hours). Still haven't done a country run though to check on the country mileage where this ute really used to shine.

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    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    Fuel economy is hovering around 8.8km per litre (11.3litres per 100km) which comprises almost entirely of driving to work and back each day (Perth Hills to East Perth & back). Lots of stop/start, air con running most days and transmission in "power" at all times. Using Shell or Caltex regular unleaded (91). Still haven't done a country drive yet.

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    Default Re: AU II Knock Sensor

    Hey Jim, Re Knock Sensor fault code and replacement. Did your car display symptoms for you to go looking for a code or did you just stumble upon it?

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    Experienced Member Jim Tudge's Avatar
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    Default Re: AU II Knock Sensor

    Yes, one thing was that on hot days I used to hear it start to ping a little then the engine would knock back the advance a bit and this would happen every now and then. This is supposed to be pretty normal with some fuels. Anyway, I hadn't heard it do this in a while and the car seemed to lack power so I checked the engine codes with my reader and it threw the code for the knock sensor. Then I posted the above.

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    Forum Regular Pendaws's Avatar
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    Default Re: AU II Knock Sensor

    It's a pity this part costs $145.00 from a Ford Dealer here in OZ but the exact same part from America can be had for under $50.00 US.
    I used to find this so much when I worked in Spares and asked Ford here WHY, they told me it was because that is what Ford in the US
    changed them for the part, BULL****. Do a Google check for this part number and see for yourselves: F8CZ 12A699 AA

    I think they are on MJ.gif

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    Default Re: AU II Knock Sensor

    I've called around and prices range from $77 - $220. Interestingly Ford came in at $175 which surprised me no end. Finances dictate the $77 part this time. I can always replace it down the track with a genuine part but eating is more important than being loyal to Ford genuine parts. Speaking of price differences though; I just did the rear door actuator and got one from Jefferson Ford for $120 compared to the $225 the local Ford dealer here in Townsville wanted. Rip-off wa**ers!!

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    Forum Regular Pendaws's Avatar
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    Default Re: AU II Knock Sensor

    WOW, at $175.00 dollars I would buy one myself for MUCH less and post to you.
    Unfortunately, there are MANY rip offs out there.
    With the Door lock and Actuator, the part number BA F26412 A $161.90 Recommended Retail and
    you would need a patch harness BAF 14A584 AMC @ $14.00 retail as the wiring plug on the original
    harness won't plug into the NEW lock. ( I hope that Jefferson Ford is sending one?)

    In defence of the Dealer in Townsville, they DO pay a large freight to get their stuff to them but not THAT
    much.

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    Default Re: AU II Knock Sensor

    Yeah I got Jefferson to send one up. There's no defence for greed mate. There's one dealership in town therefore they have a monopoly up here. Unfortunately for them the competition is one mouse click away these days and as mich as I like to support local businesses I won't pay $100 more just to be a good bloke.

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