1998 explorer 4.0 ( spark knock?)
hello,
My explorer only has 68000 miles on it and it seems to have a noise resembling a spark knock only during accelleration. The dealer tells me it's carbon build up and that I need to have the heads pulled off and cleaned. Are there any other methods or things to check before doing this extensive correction? I've tried higher octanes and it didn't respond.I've tried injector cleaner and it helped shot term but came back.
thanks for any help.
ntmud8r
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