Originally Posted by tsk1979 (Post 1722362)

Off late, I hear a strange sound from the safari, ... it goes like sss....sss....sss.....ssss, ... however, when driving with a wall next the road, its audible ...

Originally Posted by tsk1979 (Post 1722362)

Off late, I hear a strange sound from the safari, esp when she's cold. I suspect some belt, but its not like the typical chick chick sound which comes from the indica and small car belts.
The sound is more like a whistly hiss. Imagine you are trying to whistle, but instead of the whistle its slight airy sound instead of proper whistle.
and it goes like sss....sss....sss.....ssss
Depending upon your engine speed its frequency changes.
Mostly its heard on cold engine, and even then its faint. On warm engine it can be occaisonally heard.
But somehow it sounds like some polythene paper has gotten stuck to a belt and is repeatedly touching something as the pully rotates, but visual inspection of the belts did not reveal anything.
The sound is faint, so in a workshop its impossible to hear it with so much ambient noise, however, when driving with a wall next the road, its audible.

Any tips? I am worried that a belt may be about to give away or something.

Originally Posted by DerAlte (Post 1723529)

Are you hearing it with the windows up or down? With the windows down, it could be something rubbing against the inside wall of one of the tyres, like a branch or twig snagged. Does it sound in sync with something? Like in sync (rising / lowering in frequency) with engine RPM, or with vehicle speed?

Originally Posted by dadu (Post 1723551)

If this is hissing noise like extra air Leakage from the release valve of an Air tank of a truck and you can hear it distinctly when you open the hood, take it to the TASS and ask them to tighten the bolts on the common rail, inbetween the injectors, that will take care of it.

But there is some hissing noise from the vaccum release valve too, which is normal, but is not very loud.

Originally Posted by tsk1979 (Post 1723561)

This comes in parked car also. I tried looking around the belt area, there is nothing there

Yes, its similar. Will tell TASS to fix this when I go for the 45K service(Probably some time in March/April)

Originally Posted by dadu (Post 1723563)

This will come as long as engine is running and increases with time/ acceleration. Over time, you will hear it in the cabin, if not corrected.

Originally Posted by tsk1979 (Post 1723568)

TASS will fix it only if they hear it. If noise increases, then I can go to TASS and get it tightened. For example, today morning it did not come at all, even at cold

Originally Posted by dadu (Post 1691401)

Delphi will first measure the amount of diesel returning back in to the Fuel line from the injector, they will attach small bottles with premarked measurements connected to the return line from the injectors, run the engine for 5 min and check how much of diesel got collected into the bottles. This gives them an indication of the injectors performance and helps them decide if it needs replacement etc.

Philosophy: If the injector is allowing as much fuel to pass through as it was designed for, the return will also be at pre-determined levels. If its more, injector is clogged or not performing.

Originally Posted by adc (Post 1717096)

LDL dont ever wait for that red thing to work - it may or it may not and it never a good indicator. You will also find that engine oil consumption going up during this time. Air filter jammed up is quite harmful for the engine.
Also since it is a flint kind of material, bumping it to clean it does not help. Always change air filter at 7500 km, irrespective of what the manual or red thing says.