My truck knocks while it warms up, but truck sounds good once fully warmed up. I have a 97 f150 4.2 with 97,300 miles. I replaced the front timing cover gasket, headgaskets, and intake gaskets about 5 months ago, so i could avoid the whole hydro-lock issue. I am using motocraft 5w20 and fl-400s filter. any ideas? Thanks
One thing i did notice is that when i done my work to my engine, i went ahead and pulled the engine from truck and when we put it back in i drove it for about a week before i saw that the knock sensor was unplugged. It never set off the engine light. Could a bad knock sensor produce these symptoms?
my 02 has made a sorta knocking sound...if you really start trying to listen for it it tricks you into making it louder.. its made this noise since day 1...and it has over 120 k.. what im trying to get to is it really loud or are you just listening to it more.. i dont know much about these knock sensors on fords...but i raced a few of the 88-95 z71s in a stock dirt drag a few years ago and never hooked the knock sensors up on them..
hope i give you a few ideas im sure someone will get on here with more knowalge then me
best of luck
2008 f150 xl auto..373ls..4.2..projecter healights..jdm tails..k&n..vert grill..17x9 pro comps..pioneer deck
2002 ford f150 4.2..3.55..16eagle alloys..flareside..cold air intake..projector headlights..black vertical grill
There easy as heck to install and there not that expensive you might want to check it out the only other thing youll have to do is replace all the radiator fluid. In a way its like getting two birds with one stone.
Sounds like piston slap to me. My 01 had that issue. I put in some Auto-RX to cleanout the carbon and that quieted it down. Eventually the carbon build up returned, and so did the knock, and I had to do another treatment.
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