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Re: hiace van trembling during idling and take off
Clean the Idle control valve (IAC) inside the throat of the fuel intake side. Remove the air duct assembly. Buy some spray carburater or brake cleaner and run the engine at about 1200 rpms. Looking inside the throat , there are some holes on the side. Spray into these holes . Thats where the valve is located on the inside. spray for about 10 seconds. turn of engine , let sit to allow soaking of cleaner. Turn engine back on and repeat the process. If you do not see improvement in a few tries, remove valve and clean . replace the vavle if that does not work.
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Steering wheel tremble, or shaking, can usually be attributed to the fornt tires being out of balance, or, the tires themselves may be out of round, or, a rim could be bent.
I would suggest that you take the vehicle to a tire shop, and get the front tires spun-balanced. During that procedure, the tech will see if the balance is incorrect, the rim is bent, or if the tire is out of round.
Even if you have 'new' tires, an internal issue inside the tire could be the culprit.
Your best course of action is to get it to a tire shop, and get the above items checked out.
you havent gave much of a description on the trembling but i would say if it is trembling all the time maybe a engine mount as gone or if it is under braking maybe warped disc's! if it is drving and feels a bit juddery and tractor like then it may be running with a cylinder down so check spark plugs and leads etc, sorry but this is all i can think of from your description of the prob.
some times this is caused by high engine idle, or there may be an issue with your transmission, i would start by adjusting the idle, "lowering it" you can find the correct procedure for this and the right rpm range for the car in gear, in most manuals
wiggling or trembling are mostly cause by the front wheels. it could only be unbalanced air pressure of the tires. if not, it could be loose tie rod ends connecting to the steering wheel. fittings might have been worn out already and needs to be replaced. to check whether if which side is causing it, lift or jack the left or right tire, then manually try to wiggle it, push or pull it, try every possible way to determine and looseness on the wheel. do the same on the other front wheel. if one of then is loose or wiggles as you check, then there is a loose part on that wheel. check carefully.
when it does this ,see if black smoke coming from tailpipe...could be your oxy sensor not reading fuel ratio ...age seems about right for bad sensor...also if you change this ,take car for a good driveapp.20 mi. to let new sensor get a good reading on fuel /air mix coming from engine exhaust