Question about Honda Prelude

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Knocking noise from engine. very loud when idling fades away at high rpm.saw crank pulley wobbling removed found keyway was not all the way in,not letting the bolt tighten all the way up. changed pulley and bolt , but the noise is still there. does'nt sound like a rod or main bearing. someone says it could be a broken crank, but the oil pressure light is not on. dont know what to do please help.

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Here are the things that you need to check:

1. Fan - make sure that the bolts of the fan are tightened.
2. Oil - there could be a possibility that the oil pressure is low.
3. Gas - try to use a higher octane rating gas. try that first to see the knocking stops.for example if you now put 87 octane, try putting 89.
4. Check the torque converter.

Unless the car has been abused it shouldn't be the bearingsI assume you've already checked the oil level and checked for oil leaks. If it is a bearing it won't get better with temperatureI would suggest you open the hood before starting the car when its cold, then start the car and listen for where the noise is coming from. Is the noise more up front than in the center of the car? Is the noise louder at the top than the bottom? is the noise on the right side, left side or center? If you belive it to be a bearing, you can usually short out the cylinder to isolate the noise. If you start the engine and have the noise, remove the spark plug lead from the #1 cylinder and listen for the noise to greatly diminish or go away. If it doesn't, put the plug wire on and try cylinder #2, then 3 and 4. If the noise doesn't go away or get noicably lower in volume, the problem is not with a bearing.It is not unusual for the heat shields for the catalytic converter on these cars to break welds and knock when cold. It is also not unusual for the inside honeycomb of the catalytic converter to break apart and knock inside the converter housing. If I had to guess without hearing the noise, I'd bet more on the converter or the heat shield than I would an engine bearing.hope that helps.

Hope the information helps and have a great day!

Posted on Jun 15, 2009

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Hello,

Well.. First. U need to make sure the MOTOR ( engine ) was actually making the noise. Rod Knock is when the Rods in the motor. ( The metal rods that hold the pistons. ) Are knocking against something. Usually the crank or pistons wall. This usually happens when u mess up a rod bearing. This usually happens from oil starvation to the bearings. If it is really is rod knock. the sound would usually get louder and faster as the motors RPM increases. Basicly getting really bad the higher the rpm is. If you do have rod knock. You will most likely need a new motor in the end.

Take the oil pan out and check the whole thing with the oil in it. U should get flakes of metal come out but some times you will have whole pieces of metal in the pan that will not drain out. If you some metals flakes that would be a very bad news for you. The option there is to replace the engine.

Cheers!
Ryan

Posted on Jun 15, 2009

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