1998 Ford Explorer Engine knocks under load

1998 FORD EXPLORER
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ZETOR7745
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Engine Performance problem
1998 Ford Explorer V8 All Wheel Drive Automatic

Engine knocks under a load - mainly when going up a hill. I have tried different fuel grades - same. Have changed plugs - same. Is there a sensor that could be going out or has gone bad. Looking for ideas before I bring it into a shop. Thanks in advance.
Apr 29, 2009 at 10:53 PM
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RASMATAZ
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Could be the knock sensor not retarding the timing or the EGR valve not opening.
Apr 29, 2009 at 10:59 PM
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