Question about 1998 Buick Regal

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When my 98 regal is idling there is a knocking noise coming from under the front floorboard

There is a low knocking noise coming from under the front floorboard/center. noise changes when i put it in gear but is constant. cant really hear it unless your inside the vehicle

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Have it put on a lift and see what the noise is from.

Posted on Mar 19, 2014

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Low pitch whirring sound coming from front end when above 30 mph


It could be that you have a front wheel bearing that is getting noisy. Have someone ride in the RF seat and listen to the noise to try to figure out which front wheel the noise is coming from.
Also , check the tread pattern of the front tires to see if it has some unusual choppy pattern forming.

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See if you can bounce car and replicate the noise. If you can, you should be able to find it, and put your hand on it. Stabilizer bushing are a place to look, both at the lower a arm and on the frame. If you narrow it down to the strut, it will need to be replaced. The front trans mount also goes bad, try putting it in drive with your foot on the brake and give it some gas and see if the engine moves an excessive amount.

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Hello! First of all, congrats on owning a great car! That engine (3.8L Series II L67) is without a doubt one of the finest GM (Buick) has ever produced!

On to your problem - I think you have one of 2 things wrong:

1) a loose heat shield
2) a broken exhaust hanger

Both of these will cause intermittent (and highly annoying) rattling sounds, especially at low speeds or when the engine is under load (like going up a hill for instance). There are 2 hangers under the car located almost directly under the front floorboard. These are prone to breakage. There is also a heat shield in this same area - that is very prone to coming loose. If it's the heat shield - you can either remove it - or have it tack welded. If the hanger(s) are broken, you will need to take it to an exhaust shop (unless you know a welder :) ) and have those fixed - shouldn't cost you more than $20 either way.

Hope this helps and good luck!

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1 Answer

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make sure it has plenty of coolant in it if it is low the heater wont work. is there any water in the passenger side floorboard

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This is AC compressor rattle, don't worry about it unless it is really loud, in that case replace the compressor.

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Honda civic ek3 1999 model


I assume you mean low idle speed 500 rpm. Genarally a tapping noise comes from the valve train, and a knocking noise comes from the crankshaft connecting rods. The way that a mechanic will narrow it down is to use a mechanics stethoscope. You can get one pretty cheaply at an auto parts store. Put the metal end of the scope on a part of the engine and listen for noise. On the other hand, if your car is idling at 5000 rpm, it would also be making ALOT of noise.

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