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it sounds like you may have a clogged catylic convertor in your exhaust system. after the car has run for a while look at the convertor under the car sometimes they will get red from the heat. or even the exhaust manifold could be red. this just happened to my suv. to confirm that it was my convertors I drilled a 3/8 in hole in the exhaust before the convertors. then I test drove the car going up a steep hill and the car ran fine no more lack of power and the engine ran smooth. if this is not the problem and you drilled a hole in the exhaust pipe then just go to a muffler shop and they will weld the hole closed for a few dollars. good luck
need to check fuel pressure, not just listen for pump to run, also check reading on coolant temp sensor, but sounds like fuel pump /filter issue. just because you hear pump run doesnt mean its putting our right amount of pressure. also check for plugged catylic convertor
loose flexplate bolts would make noise all the time,wat u got sounds like a rattling catalytic convertor,meaning a worn out cat or cats. u can get under neath an hit on the exhaust pipe near the cats with engine off an hear the rattle ur talkin about. have u noticed a slight lack in power or performance ? another telltale sign of bad convertors. a local exhaust shop can raise car on lift an chek cats,inexpensive chek,expensive repair. good luck
The noise you prob heard was the rear brakes. Sometimes when you get them wet they will rattle and or get stuck for a few moments. did you use your emerg brake when pulling the boat on? it could just be the e brake arm or cable rattling.
If it was your cranshaft making that kind of noise.your motor would have frozen up already.it seems more like a tranny problem than an engine problem. Take it to a good mechanic. It sounds like your tranny is about to go.
You just might not hear the noise when it is at speed or the engine vibrations are not at the right frequency to cause the resonance.
I'd check the heat shield around the catalytic convertor; they are notorious for doing this and we have one rattling currently too!