Continous Knock Fault - Defender Source
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  #1  
Old October 15th, 2004, 06:03 PM
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chrisconnie
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Adam Hairston
97 LE #127/300
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Location: Boise, ID
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Continous Knock Fault

Yes...I used search. Borrowed a fault code reader. Searched again. Checked my plug wires. Searched again. Didn't see an answer to this question.

I have a whole slew of fault codes:
1) Continous knock fault Bank A
2) Misfire multiple cylinders
3) Misfire on #4
4) Misfire on #3

Like I said I checked the plug wires. I am going to pull the plugs tonight. What else should I be looking for? I am a novice mechanic at best so be kind.

Thanks in advance.

Adam
Boise, ID
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  #2  
Old October 15th, 2004, 10:14 PM
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Robert Dassler
1994 D90
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Location: Albuquerque, NM, USA
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Adam,
based on the codes, your problem may be carbon buildup in the exhaust valve guides causing valve stick. There are updated guides and exhaust valves to sort out this problem. It's fairly common. The easiest way to manually check for valve stick is to pull the valve cover and rocker shafts, remove the suspected exhaust valve spring and manually move the valve...you can feel them stick.
Rob
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  #3  
Old September 10th, 2007, 01:03 PM
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Barry O'Mahony
97 D-90 SW LE
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Location: Banks, OR
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Careful how you do that - if the valve falls into the chamber, you have to pull the heads.

J. Robison has a good write-up in his site on how to check this.
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  #4  
Old September 10th, 2007, 04:00 PM
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Scott
1997 D90 ST #1444
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Location: Georgia
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Is there some way that you can clean that out? Put in some sort of an addative or etc? I think my ST may be headed down that road and it only has 52K... I run premium but do not drive it everyday.
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  #5  
Old September 10th, 2007, 04:10 PM
BarryO
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Barry O'Mahony
97 D-90 SW LE
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Nope. That's why this exhaust valve issue is so imfamous.

Since these are exhaust and not intake valves, any addative gets burned up before it gets to the valve stem that would need to be cleaned.
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  #6  
Old September 10th, 2007, 08:28 PM
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Phillip
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