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  #1  
Old December 8th, 2013, 04:19 PM
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Rod Renfrow
1995 Defender 90 ST
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Engine knock

I am having an issue with some engine knock. Seems to be mostly upon acceleration from 1400rpm to 1900rpms. At about 2000 it goes away and crusing around there is no knock until I stop and accelerate again.
I would appreciate any ideas of what it may be?
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  #2  
Old December 8th, 2013, 04:48 PM
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Jason England
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Did you look at the vacuum advance hose to see if it leaks?
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  #3  
Old December 8th, 2013, 04:54 PM
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Chris Snyder
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Do you have any reason to rule out an exhaust leak from the manifold or manifold to Y-Pipe connection?
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  #4  
Old December 8th, 2013, 05:48 PM
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John Robison
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Noise on acceleration may be from worn piston skirts. It might also be catalyst rattle. I'd certainly put the truck on a lift ands check that first. Rocker shaft rattle tends to be independent of throttle.

To check, try pulling plug wires one at a time as you gun the motor. If one wire (pulled) eliminates the rap you have found your noisy cylinder and you know its an internal problem.
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  #5  
Old December 8th, 2013, 06:25 PM
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Rod Renfrow
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Thank you for the advice.

I haven't checked any of that but I will.
Thanks again,
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  #6  
Old March 17th, 2014, 03:57 PM
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Rod Renfrow
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It was the catalytic converters after all.
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