Re: making loud banging sound when gas pedel pushed
This sounds like a broken motor or transmission mount. Try to isolate the location of the banging noise to give you or a mechanic an idea of which mounts to check first. Some motor and transmission mounts can be tricky, so you may have to remove them to see that they are worn or broken.
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While I'm driving my 2001 Chevy zr2 in four wheel drive there will be aloud banging noise from under the truck that sounds likes it's coming from the passengers side! I changed the vacuum actuated and the actuated under battery tray , u joints,axle fluids, and it still makesthat loud noise after driving it for about five minutes, aanyone else had thisproblem any help would be appreciated
Is your car well protected with antifreeze? If not, maybe a freeze plug came out. Living in Montana, cars stay outside all winter. I always use a 50-50 solution of antifreeze. Never had coolant freeze up. Before cranking the car, check that your timing belt did not pop. Don't know how it could, sitting there 14 hours, but turn crank slowly by hand, and check that camshaft is also turning.
Check to see if your strut spring is loose. If there is a lot of rust in the area, check to see that none of the spot welds came free and he strut came loose. It may be a rear shock on that car and not a strut, Either way. Check to make sure nothing is missing a bolt or moves when pushed or pulled. You don't want to find out by losing control on the expressway.
it means that you need to research either a different car, or a different engine for this car. A loud knocking noise indicates a connecting rod is loose, and your engine has little to no time left before the rod or endcap breaks, completely messing up your engine, and making it very difficult to change. If you must drive it, drive it slow, and be super gentle with the gas...like you're driving on ice. If it's more of a ticking noise, that could be a lifter, but a loud hollow sounding knock is a rod. You may also have a check engine light showing up on the dash from the knock sensor.
find a safe area where there is some sand on the road ot wet leaves or something that will make traction a little less than ideal. drive into it and hit the brake pedel as fast and hard as you can. if the abs works it will activate. it feels different on different systems and i am not sure what bmw does but some will groan very loud, some the brake pedel will push up against your foot some cause the car to pulsate. basically you should feel something unusual in the brakes and it should not do a long hard skid like the cars of the past. you will hear some squeeling but the car will want to resist a constant skid.
It would make sense that it is suspension related as it does not make noise at idle but going down the road it does. I would lean towards it being a bad wheel bearing. Does it sound like it's coming from one side or the other? Also how many miles on the car? Does it get louder when the wheels are turning?
You can check the bearing easily by jacking up that wheel and moving it side to side and up down checking for play, a little bit of play is normal.