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Additional information posted on chryslerforum.com

My 01 PT Cruiser suddenly started giving signs of detonation. Replaced Knock Sensor although no codes were indicated. 180K w timing belt replaced twice, E3 spark plugs w/maybe 20K.Tried higher octane, have used fuel injection cleaner w/every service @ 3K since new, original owner.Where do I look next? Don't understand problem w/no codes. Regularly get emission codes related to PCV hose, have to regularly tighten clamps on hose (added when first code showed). hose replaced at least twice.. I only mention this to indicate code system is functioning. HELP, need a direction to look.
THANX, Roger
 

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An EGR that does not fully close could lean out the air/fuel mixture and not set a dtc. The EGR would be able to open sufficiently to pass the EGR test, just would not close completely.
 
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