Lots of input
I will try to answer question asked.
IMP update: When fuel tank is full, vibration intensity reduces to the minimum. Could this is because of damping due to fuel weight? As fuel tank becomes empty vibration intensity increases. Or, is it something to do with fuel pressure? Quote:
Originally Posted by Jeroen 15- 30 Hz usually comes into play on suspension components. But they are designed to transfer much lower frequencies to the body/chassis. But then again a faulty suspension component could cause this as well. But tends to play up at a given speed, rather than a specific RPM in all gears.
|
Suspect of suspension is ruled out because at 1000 RPM, in first or second gear speed is very less.
Quote:
Originally Posted by hserus That rpm band is very specific - just past the idling speed. There's an idle air control valve that is a prime suspect in such cases. Or a fuel temperature sensor.
Was the vehicle scanned for errors at all? |
Fortunately, no error indication. Service center also checked error code by connecting laptop, no error code.
Quote:
Originally Posted by srini1785 Check the engine mount rubber pads and all place where the engine is connected to the body. You need to stop the engine vibrations from transmitting to the body. |
Vibrations are there from day one of the purchase. Engine mount was prime suspect and Concord service center tried changing them.
Quote:
Originally Posted by --gKrish-- Try removing the belts for engine auxiliaries like PS pump, AC Compressor etc. and check.
Also, it wasn't clear from the post whether the noise occurs when the vehicle is not in motion and the engine is revved to 1000-1100 rpm. Could be an out of balance shaft. |
Vibration intensity increases as load on the engine increases. For e.g. if A/C is ON or if car is driven on incline, vibrations becomes stronger.
Vibrations are minimum when car engine is revved in neutral. Vibrations are also minimum if clutch is depressed, car is in gear and engine revved to cross said RPM band.
Quote:
Originally Posted by alpha1
Anyone on this forum who has the exact same make/model/version of the vehicle: if they can verify that the same happens or doesn't happen in their vehicles. |
Exactly! I request Safari Storme EX (updated) owners to report.
Quote:
Originally Posted by hserus Check the air intake as he says, and also the idle air control valve |
AFAIK, air is not throttled in diesel engine.
Quote:
Originally Posted by Kosfactor The resonance starts around the time the engine is coming off idle and increasing revs. At this point the engine is asking for more air and fuel - its not getting enough of it perhaps. |
This is good point.
Quote:
Originally Posted by Turbanator
I don’t have an answer for this but why will someone get so many parts changed on his new car?
Perhaps, that’s the old TATA way of doing but in my opinion absolutely wrong way to diagnose or rectify a problem.
If the manufacturer is not sure of the parts it put in a new car, they should simply stop production until they are absolutely sure of the quality of what they are going to assemble. |
Yes. Concord service center could not diagnose problem. They involved Tata Motor also but no solution to the problem. This method of diagnosis is like shooting in the dark.
Quote:
Originally Posted by Reinhard So these vibrations/resonance - is also present if the car is revved in the specified RPM range in neutral when standing still? Happens only when in gear & in motion? Any difference when the clutch is engaged/dis-engaged? |
Vibrations are minimum when car engine is revved in neutral. Vibrations are also minimum if clutch is depressed, car is in gear and engine revved to cross said RPM band. Clutch engaged/disengaged makes no difference.
Quote:
Originally Posted by landcruiser123 A friend of mine had a similar issue in his Scorpio between 900-1000 RPM. An FNG diagnosed it to a couple of lose body mounts which were torqued.
|
Engine mounts changed and torqued to correct specification made no difference to the vibrations.
Quote:
Originally Posted by condor Can you share a recording of that sound ?
26Hz ? |
Such a low frequency vibration are felt rather than heard but there is audible boom inside the cabin. There is one more app in iPhone that can record sound db level. Pl. refer the screen shot when car is moving in that RPM band.
Quote:
Originally Posted by Ace F355
2. My other suspect is the flywheel. Because it is a DMF (dual mass flywheel), it does a phenomenal job of cutting down on vibrations. However, it is possible that in my use case, the flywheel might have worn out a bit and that's causing vibrations in a fixed rpm band. Since my clutch is absolutely fine so far, I am going to look at it at during next clutch change which is still sometime away (53k on current clutch and I expect another 35-45k minimum). From my experience with Ford A.S.S. so far, I unfortunately don't trust Ford's diagnosis abilities to understand this right now - hence living with the current situation. |
Engine mounts are good. Flywheel is not of DMF type. They changed flywheel also but all efforts in vain.
Quote:
Originally Posted by amit_purohit20
In Engine assuming that the Engine does not has a imbalance issues right from factory, the other factor which can imbalance your engine is Front Damper pulley. This pulley is mounted on the crankshaft opposite side of Flywheel which reduces the torsional vibrations.
Other parts which can be of imbalance itself is the crankshaft and flywheel itself. Many auto manufacturers pair these two parts, check for imbalance and then drill holes to reduce the imbalance. |
Unbalanced components inside the engine is my worst fear because car is new. My friend has filed complain in the consumer court.
Drilling holes in the flywheel to balance it or adding balancing weights to the appropriate position on the drive shaft is solution but expert level of Concord service center is too low to do this. TATA should have solved this problem but they don't have will to solve this problem. Surprisingly Varicor-400 engine (VX version) don't have this problem that means TATA is aware of this problem. Quote:
Originally Posted by SS-Traveller Body on ladder frame chassis, with low rpm harmonic vibrations - first thing to check and replace are the rubber mounts, and then tighten all the bolts connecting the body to the chassis.
Was this item checked by the workshop? |
They re-torque all the bolts in every service but no effect on the vibration.