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Discussion Starter #1
First of all, I love driving my stock '02, 1.8t. It's so sweet when it's right. At about 80 mph, I notice how the road inevitably, dips and rises because, with every rise that normally causes cars to squat a little, a vibration occurs until the suspension is finished responding and the car is planed out again. When the road dips, no vibration, but I know, with every dip, there is a rise and the same vibration. When this downward stress is present, this vibration happens. The car has about 230,000 miles on it. I like this car enough to try to find out what's going on and address it. It's better than a car payment every month and this car is sweet! I can do many parts changes, even on these shits, but need diagnostic help. Any ideas would be appreciated.
 

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Sway/Stabilizer bar bushings...would be my first (cheapest) guess.
do you know if they have ever been replaced? by 230K they probably should have been swapped out twice by now.

I don't know enough about which other forward suspension areas to hit next specifically...though if it only changes when going straight through rises and dips or does it stop on steeper/faster turns too? if it only happens going in a straight line it might be your shocks/springs/ball joints or other suspension components.

and again, at 230k...a lot of these things should have been replaced at least once.
 

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Many different issues can cause this. Any of the (8) control arms, tie rods or wheel bearings. You will need to lift the car and check for play.
 

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Discussion Starter #5
It sounds like I should buy a kit and start replacing these things. I am considering the $200 front end kit from 1a auto. It seems cheap though. I just want to keep it stock.
Thanks for the help thus far.
I'll post up results
 

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Yeah, I've used them before. I'll check into that for sure. It's good to hear experienced knowledge and feel confident with these buying decisions.
Thanks
 

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For my cars, I spent a lot more and got the Meyle HD. At the time, I was expecting to keep each one at least another 6-7 years. The cheap sets lasted only 50K for the uppers and about 70K for the lowers.
 

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It sounds like a weight distribution thing to me. Check the front engine snub mount first. Going through a dip will push the motor down and if your snub mount is shot it will transfer the engine vibration through the chassis. It's under the radiator. There is only 1/2 inch of play up or down till its metal on metal and even less if your engine mounts have sagged a little. Easy fix if this is your problem.
 
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