tire Strap Tie
tire Strap Tie
Please help! What is making my Corsica shake so violently?
It started out just shaking a little when I accelerated up to about 60 mph. I went and had the tires balanced, thinking that might be the problem. It wasn't. Over time the shaking got worse. One mechanic told me to change my EGR valve. It didn't help. Now accelerating up to 50 makes the car shake rather violently, and even at 25 mph it'll start shaking. One friend told me it might be a tie rod problem, but I've already spent a lot of money on what the problem /isn't/ and I'm too strapped for cash right now to keep doing it. Any advice would be wonderful!
The mechanic who told you EGR - was working off a hunch. I've seen that behavior, but generally it will only "chug" (jerk forwards and backwards) in a very specific speed range, say 40-50 mph. So it was a good guess, but just a guess, he shouldn't have done that.
It sounds to me like your problem starts around 25 and goes way up to 60 mph+.
We need to rule out drivetrain problems (engine, transmission) versus chassis issues (wheels, tires, struts).
Here's what I want you to do. Go on the highway, get up to about 60-70 mph, and when there isn't traffic behind you, get off the gas pedal and carefully shift the car into NEUTRAL. Coast along till the speed drops about 10mph, noting if there is any change to the vibration! Then put the car back in Drive. As long as your foot is OFF THE GAS PEDAL you do no harm taking the car between drive and neutral. Obviously you must also never go into Reverse, Park, and stay out of the Low gears too. 
If the shaking stops when you go into neutral, it's a drivetrain issue. Then try this: at a stop sign, put the car in "2", accelerate to 30mph. Still shaking? That points to engine and if the basics have been checked out like plugs and wires, air filter, then I have to wonder if it's the fuel pump. Especially since you say it used to only do it at high speeds (heavy demand on fuel pump) and now its starting to do it lower and lower.
Shaking stopped? Could be tranny. Check tranny fluid for being full (while engine is hot and running) and being pretty red/pink, clean looking. You don't want dark red/burnt smelling.
If the shaking did not stop when you put the car in neutral on the highway, it is not engine or tranny related. Try rotating your tires, front to rear, and see if the nature of the vibration changes at all. i'm not expecting it to go away - i'm just asking you to note a difference. If no difference at all - then it's not wheels/tires.
You need to do some more troubleshooting, but if I had to guess at this point, i'd say:
Fuel pump.
An honest mechanic can hook up a fuel pressure gauge in 5 minutes and test it for you. Should definitely charge no more than like $30, if that. If you're not up around 40psi that's your problem, the engine is starved under high fuel demand.
Thule 963 Spare Me 2 Bike Spare Tire Rack - etrailer.com
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