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Engine Knocking Sound..

(1990 Pontiac Firebird)
in Nashwauk, MN on April 23, 2012
I Own a 1988 Pontiac Firebird and somewhere under the fuel injection system i can hear a knocking sound. i don't know what it could be..
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Popular Answer
on April 24, 2012
Could be serious....suggest you have a qulified technician that does engine work listen to it to give you guidence.
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