Question about Honda Civic

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The knock sensor on my 2000 honda civic came on. the shop tested and reset the sensor. it came back on the next day so they did more testing and ended up replacing the sensor. On the drive home that night the light came on again with the same knock sensor code. they looked at it again today checked all the wires/sensor and couldn't find any problem. They are now saying we need to replace the whole ecm. just wondering if you can think of anyother solutions?

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  • danielhelpme Aug 27, 2010

    I pulled out the spark plugs but they all looked the same and none of them look glazed. I was wondering if it was possible that the sensor shorted out and then shorted part of the ECM out? that's what my shop's thinking but I'm not sure I want to replace the whole ECM if I'm not 100% sure that's what it is if you know what I mean. So just wondering if you had any other ideas? Thanks.

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OK let us assume the knock sensor and ECM are working as they should. The knock sensor is detecting a mis-fire event. Remove the plugs (please note the order by numbering them) and examine them. Do they all look the same? or does one look odd like it has been running hot? It will no longer look matt grey but will now have a bit of glaze to it . This what I think is happening. Civics and Hondas in general have an issue with their EGR assemblies. THe EGR valve is designed to let a measured amount (up to about 13%) of exhaust gas back into the inlet manifold to mix with the incoming air. When this is introduced to the cylinders the mix is now rich (some of the air is inert exhaust gas) and this cools the ignition temperature to the extent that harmful nitric oxides are eliminated from the the exhaust gases. The EGR is an emission device. On Hondas the exhaust gases from the EGR valve are channelled directly by a passage assembly to each individual air runner immediately leading to each cylinder. If one channel becomes clogged with carbon (soot) deposits then the respective cylinder will run hot, so hot in fact that it will cause mis-fire and this will trigger the knock sensor. The blockage of an individual passageway is not detected by on board diagnostics. If you have the evidence of a cooked plug and a knock sensor error I would strip out the EGR passageway casting and clean out the individual channels. It's not the easiest job and will take several hours. There are some on-line video examples of this being done. A useful tool is a 45cm length of fraying hand brake cable fitted into the chuck of a drill. This works as an excellent flexible brush to reach up pipes etc. Once the job is done it should never need repeating.

Posted on Aug 26, 2010

  • 3 more comments 
  • danielhelpme Aug 27, 2010

    I pulled out the spark plugs but they all looked the same and none of them look glazed. I was wondering if it was possible that the sensor shorted out and then shorted part of the ECM out? that's what my shop's thinking but I'm not sure I want to replace the whole ECM if I'm not 100% sure that's what it is if you know what I mean. So just wondering if you had any other ideas? Thanks.

  • danielhelpme Aug 27, 2010

    I pulled out the spark plugs but they all looked the same and none of them look glazed. I was wondering if it was possible that the sensor shorted out and then shorted part of the ECM out? that's what my shop's thinking but I'm not sure I want to replace the whole ECM if I'm not 100% sure that's what it is if you know what I mean. So just wondering if you had any other ideas? Thanks.

  • danielhelpme Aug 27, 2010

    I pulled out the spark plugs but they all looked the same and none of them look glazed. I was wondering if it was possible that the sensor shorted out and then shorted part of the ECM out? that's what my shop's thinking but I'm not sure I want to replace the whole ECM if I'm not 100% sure that's what it is if you know what I mean. So just wondering if you had any other ideas? Thanks.

  • danielhelpme Aug 27, 2010

    I pulled out the spark plugs but they all looked the same and none of them look glazed. I was wondering if it was possible that the sensor shorted out and then shorted part of the ECM out? that's what my shop's thinking but I'm not sure I want to replace the whole ECM if I'm not 100% sure that's what it is if you know what I mean. So just wondering if you had any other ideas? Thanks.

  • danielhelpme Aug 27, 2010

    I pulled out the spark plugs but they all looked the same and none of them look glazed. I was wondering if it was possible that the sensor shorted out and then shorted part of the ECM out? that's what my shop's thinking but I'm not sure I want to replace the whole ECM if I'm not 100% sure that's what it is if you know what I mean. So just wondering if you had any other ideas? Thanks.

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