[Rahulk76]

Need ur advice on the following
Recently I have observed that in mornings or late evenings after the vehicle is stationary for 6-7 hrs, I have to crank the
engine many times around 7-8 time to get it started.
(Battery/Alternator in good cond though)
And once it starts it throws out huge dark greyish black smoke
for few seconds and then settles down. I am not sure as to where my engine is heading to

Rahul
Pune DLS-2003/ 16kmpl - odo-44000kms[/FONT]

[kb100]

WHAT CAR??... DIESEL (I presume??)

[Psycho]

I am assuming you have the indica diesel DLS, suggest that you check the glowplugs.

[Rahulk76]

[FONT=Courier New]As suspected,. the problem indeed was with three glow plugs
being faulty.
Service station charged all 4 costing 351x4 + 160 rs labour for
the set

Also it was found the the actuator switch of the EGR doesnot
function as it shud. It seems that the switch is faulty or the
wire which connects it isnt getting current.[/FONT]

[nitrous]

EGR?? IS that a Dicor or a scorpio CRDe??

[Zappo]

Originally Posted by nitrous

EGR?? IS that a Dicor or a scorpio CRDe??

Nitrous anna, even the Indicas come with the EGR. I am not very sure about the 2003 model though. Current ones (BS-III) do come with EGR.

[Rahulk76]

Mine is Euro II with EGR fitted. Its a 2003 model.

Somehow the switch seems to have malfunctioned and egr is not getting actuated. Egr Vlve solenoid switch costs a bomb 2000/- with labour. :(

now due to that i have a rough idle at RPM's close to 1800 -2500 when it shud get activated.This is due to engine detonation happening it seems. Ill check the wiring if it is lose or something just to ensure that i dont spend 2k

EGR Theory. EGR serves one purpose and one purpose only. That purpose is to reduce Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2) in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion temperatures, the Nitrogen reacts with the other two byproducts and forms Nitrogen oxide (NO). After being released into the atmosphere, it picks up another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of sunlight,
it combines with other compounds like Hydrocarbons and forms Smog. Since exhaust gas is inert (very stable) it doesn’t burn again. So by being introduced into
the combustion chamber, it will lower combustion chamber temps enough so that
the Nitrogen doesn’t react with the other compounds and is passed unchanged out
the tailpipe thus not contributing to smog. Now, since exhaust gas doesn’t burn, it
doesn’t exactly help with combustion. At higher RPM’s, this really isn’t noticable,
but at idle, the reintroduction of exhaust gas will cause a very rough idle and can
cause stalling if to much is introduced into the combustion chamber

The design challenge The EGR system of today must precisely control the flow of recirculated exhaust. Too much flow will retard engine performance and cause a hesitation on acceleration. Too little flow will increase NOx and cause engine ping. A well-designed system will actually increase engine performance and economy. Why? As the combustion chamber temperature is reduced, engine detonation potential is also reduced


Rahul

[turbo_c]

Well written explanation of EGR dude !

- T u r b o C -