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Pre ignition

(1999 Ford Escort)
in Houston, TX on March 23, 2009
my car knocks, even with premium gas. i have checked all vacuum hoses and cleaned the throttle body and EGR. What else can I do?
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Popular Answer
on March 26, 2009
Probably the mass airflow sensor is bad, Napa has rebuilt units available $108 to $139 plus a core charge, about 1/2 hour to replace
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