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Rattling Sound When I Drive Like A Chain Dragging


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#1
rasta4life

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I have a 1998 Maz 626 when I drive the car I hear a rattling sound like a chain dragging on the ground, I thought it was the struts but just changed them an it is still making the chain sound.I can not figure what the hell it is.any help please.thanks

#2
NickR

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Some possibilities:

1. Check the flex pipe on the exhaust (the braided metal thing). See if there is a metal ring hanging loose either just in front or behind the flexpipe. If there is, just cut it off.

2. The dust shields around the brake rotors (disk brakes) sometimes rust and bend, or get stones in them. Jack up each wheel in turn and see if you get the noise when you rotate the wheel.

3. Do you have ABS? I have read that there is a little wheel thingy that sometimes comes loose and makes a ringing noise. If you have ABS I can search for the thread I read about this (it might have been on another board).

Does it do it more over bumps? In any gear (including neutral)? When you brake?

#3
rasta4life

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Nick thanks for the reply.you hear it when it goes over bumps and even when you drive it. I will check those suggestions you said and see if it helps.Again thanks for the reply

#4
itschuck2c

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Also check any of the heat shields for the cat and exhaust

#5
plastic.racoon

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I put my money on the heat sheild. Have you been redlining it? Heatsheilds break easy.

#6
Trebuchet03

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Heh, some people just drive without the sheild :huh: Thats a good place to look though, with the engine cold :ohmy: . It kinda makes sense to have it if you have the stock snorkel though (the one that goes over the radiator and scoops air from the hood seam).

#7
meankilleR

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I say its the dust shield on your brakes, it happend to me, they rust and they bend by just lightly touching them. Bend them the other way.

#8
Majisto

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You sure the engine isn't pinging? I know these cars are supposed to have knock sensors, but pinging makes that sound. It should be worse under heavy load like going up a hill.

#9
JamesHart

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Same thing happened to me, had to get a new exhaust back box and end pipe.

#10
dclub01

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You sure the engine isn't pinging? I know these cars are supposed to have knock sensors, but pinging makes that sound. It should be worse under heavy load like going up a hill.

Is this bad? I think this has happened to me b4, although i haven't seen it again since, and it was while going up a rather steep hill.

#11
Majisto

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Pinging is early detonation in the motor. It can be caused by hot spots in the combustion chamber. Some people will go up in octane to stop this. This if why octane even exists is to stop early detonation. Still, these cars have knock sensors and the Vulcan Taurus that pings for me does not have a sensor. Check those heat shields first and then see if the gas you are using is bad.

#12
itschuck2c

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Pinging going up hill is normal..pinging driving on level ground is not..(rule of thumb..pouncing on the gas can cause a ping too..also normal..). I really doubt if the sound you are hearing is much more than tightening the heat shields..always go with the simple solution first..its usually the correct solution.

#13
Trebuchet03

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I dont think the engine should have detonation at anytime... level, uphill... whatever... :huh:

#14
Gene

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Pinging between 2 & 3000 RPM can also happen if the EGR valve is not opening as it should.

Gene

#15
Smokey

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Sounds to me like the cluth on your AC compressor, they make a chain sound when they are going...




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