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knocking sound (video)

Old Jan 29, 2011 | 06:18 AM
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Default knocking sound (video)

97 blazer, if you listen closley you can hear a knocking sound, thougts?
Engine runs fine except for some missfires at 1500-2000 rpm which i suspect to the the sp-423 problem that rifleman 308 solved.

http://www.youtube.com/watch?v=BaAYa8DWS84
 
Old Jan 29, 2011 | 01:58 PM
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Default made 1 more vid

knocking is alot clearer now, going uphil.

http://www.youtube.com/watch?v=Muu-7_d3SeE

ive droven with this knock for 1 year, nothing has broken down... what can it be??
 
Old Jan 29, 2011 | 05:10 PM
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google google... could this be a bad egr valve knock? maybe it wants to be cleaned..
 
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