Sounds like camshaft moved and valves are hitting pistons ... not good sign valves will bend .
Does it sound like someone knocking on a solid hardwood door? If so, it most likely is a failure of a piston connection rod bearing or a crank main bearing. An easy way to check this is to start the car and then take the spark plug wires off of the plug or distributor one at a time (if you can, some new cars won't allow this) If the knock stops when you pull the plug wire off, the rod bearing in that piston rod is destroyed. NOTE: NOTE: NOTE: be VERY aware that a running ignition system can SHOCK you if you lean up against the car or ground yourself in any way. This isn't a tiny shock. It is about 30,000 to 50,000 volts and hurts a great deal. (don't ask me how I know) If that is the case, your engine will need to be rebuilt. I have seen times where a transmission cover was causing a noise while the car is running but it would be a very slight chance that this is the problem.
SOURCE: Replacing the timing belt on a 2002 Honda Odyssey
you need a haynes repair manual . it save you time. it shows you step by step . what to remove to get to timing belt or chain . show you photos how to set timing chain cam and crank timing marks.
SOURCE: what is the timing belt interval replacement for a
WELL I CAN TELL IT IS 105.000 BUT SOONER IS BETER HOPE THIS HELP AND YOU WILL DO WATER PUMP AT SAME TIME
SOURCE: changing timing belt on 2002 honda odyssey
good luck. Its not that hard. Make sure you get timing marks right.
SOURCE: the timing belt diagram for a honda odyssey 96.
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SOURCE: how to change plugs on honda odyssey 2005
you will need
8mm
10mm
5/8 spark plug socket
3/8 ratchet
3/8 extension (it could be 4in and longer)
and spark plugs factory plugs are pregap iridium
spark plug torque is 13.0 lb.ft
coil torque 8.7 lbf.ft
spark plug part # NGK 1zfr5k-11
# DENSO pkj16dr-m11
and spark plug anti seize on spark plug thread
what you need to do is remove the plastic cover 8mm socket or 10mm sockets
now remove the spark plug covers and remove the spark plug coils too 10mm head bolt you will need a 5/8 spark plug socket and a 3/8 ratchet and a 3/8's extension too
you need OEM spark plugs they work the best
hope this will help
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