I recently bought a used Suzuki Jimmy and when it hits about 50Kms it starts shaking violently. I have to slam on my brake to stop it. The wheels were recently balanced and it is still doing it. What else could it be? Any suggestions to tell the Mechanic?
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Depends on how the shaking is for the car, it could be a few things. If it sounds like it is running terrible and shaking, the chance is that it is the MAF (Mass Air Flow Sensor) which is located along the air intake pathway for the motor's air intake. If the sensor is faulty, then the car can vibrate but also blatantly sound like it is running rough.
If it is your steering wheel shaking while braking and not the car, then your brake rotors are warped from wear due to braking habits with dragging the brakes or a lot of heavy braking - created a high heat situation with the rotors to warp the metal.
If you recently had your tires changed, it could mean an unbalanced tire. Also check to see if your tires has any bulging from possibly hitting any curbs or potholes recently.
Computer testing is not going to find most mechanical failures. The computer systems in your vehicle controll electrical circuits.
It sounds to me like you may have some suspension bushings that are worn out. If it feels like the front (i.e. the sterring wheel is shaking, then check all the front suspension parts for looseness and wear. If it feels like the rear, make sure that the strut arms for the rear suspension do not have worn out bushings. Check all of the struts and/or shocks.
I had one of these one time that would be cruising down the highway with no problems, then you hit a rough spot in the pavement or a small pothole and the thing would start shaking so violently that it was threatening to go off the road. It turned out to be worn out bushings in the rear suspension.
I just changed the brake pads and rotors on my father's 2001 Trooper that he recently purchased because they were shaking just like your were. He bought it from a mechanic shop and they had put new pads on it but it needed new rotors as well. If there is noticable groving on the rotors and new pads are installed it can create shaking, sometimes severe, when the brakes are applied. It sounds like this is what has happened with your vehicle as well. That being said, I don't consider it a huge safety issue to drive it until you get it fixed, just know that your braking will not be optimal and that it will take you longer to stop than if the brakes were working properly. All that being said, get them fixed ASAP so you don't have to worry about it. Who wants to mess with safety right? Good luck, hope this helps!