Started with loud idling or surge now a loud rattle sound from under car or engine maybe exhaust is opinion of a friend
I suggest you have your car checked as soon as possible - while a rattling exhaust isn't desperately urgent it could be the cat breaking up which might later restrict the flow of gases. Most importantly excessively loose timing belts or chains tend to make most noise when the engine is idling. If the noise is being caused by this delay could be very expensive.
SOURCE: MY 91" TOWN CAR SIGNATURE HAS BEEN MAKING A LOUD
hi this sounds like to me you might have a loose baffel in the box, the reason why the sound dissapates when you get to a certain speed is because the baffel is pushed up or down due to the pressure when you slow down the pressure then releases the baffel and it starts rattling again, you might also have a broken clamp on your exhaust or even a missing rubber bush check these out first...good luck
I would remove or have your oil pan removed and check for any unwanted pieces in there. Maybe first see if there is anything stuck to drain screw. Drain oil maybe... You may have blown a rod.
SOURCE: 1994 lincoln makes a loud metallic twisting and popping sound when accelerating
check water pump bearings Check power steering bearings. Check fan belt for condition and tension.
Testimonial: "thanks, there is fluid leaking now. looks like power steering fluid. how can i check the power steering bearings? i can back it up, even pulling forward for the short distance i can hear the loud popping , twisting, metallic sound. i'll get back to you when i get a jack, tools, etc. thanks"
SOURCE: Could a loud rattle on right side of car be the catalytic converter? 1998 Lincoln Town Car
It could be the heat shield that's on the Catalytic converter.
They do let go quite often, its ok to remove it if its lose.
I would replace the intake asap if you already have a replacement. Is there coolent in the oil or a milky looking stuff in the oil or on the oil filler cap. Your piston rod bearings do not like coolant and can go bad very fast if there is coolent in the oil. That could be the sound you are hearing.
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