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Discussion Starter #1
Guys,
Whenever I drive my car it makes a knock/rattle/vibration that's feels like it's hitting against the floorboard. It does it more when I'm turning and even more when I'm going slow? It never really does it when I'm just cruising along going straight but will do it when I'm just sitting at a stop light idling. It'll do it when I'm in reverse, park, neurtal or a forward gear(TH350). Does that sound like anything to anyone or can someone give me a little troubleshoot list? Exhaust, U-joint, wheel bearings, tranny mount, rear-end...etc???
The only thing that doesn't add up with any of that stuff being the noise maker is that any given thing would either make the noise while in gear or in park or moving or sitting but not BOTH (unless it's exhaust(which is brand new).
Thanks,
Donnie
 

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Here are some of the more common rattlers. Shift cable, speedo cable, emergency brake cable, fuel or break line that has popped out of its clamp, header or exhaust.

Take a rubber hammer to the underside and start rapping on the subframe and floorboards to see if you can duplicate the rattle.

-dnult
 

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Sitting still your wheel bearing should not make noise. I agree with the exhaust theory. I bet it is very close at some point and when you load the engine (turning,etc..) it can vibrate more. That's why you wouldn't hear it while cruising along. A u-joint wouldn't make noise while sitting still or in park (the drive shaft won't be turning).
 

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Discussion Starter #5
Thanks guys! Yeah, I was thinking it had to be something in the exhaust I just haven't had a chance to get under there and look around yet...
Thanks again,
Donnie
 

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If you have Headers you may wanna Check to see if they are Possibly hitting the shifter linkage when the Car is running at Idle, Very Common Problem with headers ( wish they Came Pre- Dingged )
 

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DjD is probably right. I have mufflers installed that the guys spot welds busted loose on. The muffler dont have slots to allow the clamps to clamp the mufflers to pipe so it's a half muffler half pipe clamping. Pretty lousy install job I guess. Hangers and clamps like to make noise especially on bumps.
Just grab the adjustable, sockets and wrenchs and go for a slow crawl and at least know what it isn't.
 

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A trick I learned at a muffer shop is to grab the tail pipe(s) and shake it. This will often show where an exhaust is rattling.

Bob.
 

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I have used Bob's trick. Shake the exhaust at the exhaust tip and it should hit if it is going to.
 
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