I have a 2010 vitara....recently i have been hearing a knocking noise emanating from under the vehicle....this noise is heard when i am on either rough or uneven roads....what are the possible causes

Diesels do knock on start, but that is not the only knock that there is, I would need to hear the noise it may be a rod bearing

IGNITION KNOCK (DETONATION) SENSOR the knock sensor Is on the back of engine (driver side on LHD vehicles) under the cam position sensor. it is a giant PITA to change. i had to cut a wrench in half (7/8 i think??) and use a pry bar to break loose the sensor..
((found this info from a Suzuki forum.))

So how bout that knock sensor Suzuki Forums Suzuki Forum Site

Ignition Knock Detonation Sensor fits 1999 2009 Suzuki Vitara XL 7 Aerio

http://www.autopartswarehouse.com/shop_parts/knock_sensor/suzuki/vitara.html

P0325 Knock Sensor Diagnosis EricTheCarGuy

pinking, aka, pinging, knock,and best of all detonation (truth it is)
pinging does not happen, deceleratiing ever, that is pure noise

pinging happens under load, (hills) and lean air fuel mixtures.
and a dead EGR valve.

so engine noise, buy a $5 stethoscope,
listen for exact source location
or get it serviced.

old post.,

It sounds like one of your CV (constant-velocity) joints is going bad. This is common on front wheel drive vehicles. The CV joint allows the drive axle to pivot as you turn the wheels. Over time the protective boots crack, the grease leaks out and you end up with the knocking noise you describe when turning while accelerating. The dealership should easily be able to inspect the CV joint boot and diagnose the CV joint.

Valve train noise would be my guess like a sticking camshaft follower.

this will take hands on test by a mech.
we can not do that here, we can not do the tests, or look or wiggle things. to find it.
we use a cheap electronic ear test device, to find noise and that is hands on too.

Suspension and steering noises also need to be checked out as soon as possible to be safe. When a suspension component, such as a tie rod end or a ball joint is badly worn, it can separate, sometimes even causing the vehicle to lose control. If you hear a knocking or other noise from the steering or suspension, have it checked out. Here are few examples of the typical suspension and steering noises. Of course, there could be a lot more problems in the suspension and steering that can cause various noises. Any noise should be properly diagnosed.


Mercedes Custom Wheels

Check the idler and tensioner pullys for your serpentine belt. I suspect the whining noise heard earlier was due to the fact one was getting a bit stiff or rough turning. When you gave it that extra fuel, the sudden load may have finished it off. Sometimes they lock up, and sometimes they fall apart. Check those items first.

Its hard to say or diagnose noise without hearing it in person. without hearing it in person it going to be tough. Noise can be belts, power steering pump, tension pulley, rod knocking, valve tapping etc? the best thing to do if you still driving the car, is to take it to the nearest gas station that has a garage and have one of the mechanics to listen to it and wont cost you a penny and they will able to tell what making that noise; guessing the sounds its like playing charade.

check the vehicle knock sendor, are u using the right grade of gas, and oil for u temp zone