Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 10th March 2006, 11:12   #1
Senior - BHPian
 
Rahulk76's Avatar
 
Join Date: Sep 2005
Location: PNQ
Posts: 1,133
Thanked: 204 Times
Default Dark Greyish Smoke bellows from exhaust pipe

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]
Rahulk76 is offline   Reply With Quote
Old 10th March 2006, 11:49   #2
Senior - BHPian
 
kb100's Avatar
 
Join Date: Feb 2006
Location: Bangy Boy!
Posts: 1,554
Thanked: 14 Times
Default

WHAT CAR??... DIESEL (I presume??)
kb100 is offline   Reply With Quote
Old 10th March 2006, 12:01   #3
Senior - BHPian
 
Psycho's Avatar
 
Join Date: Jul 2004
Location: Bangalore
Posts: 1,042
Thanked: 95 Times
Default

I am assuming you have the indica diesel DLS, suggest that you check the glowplugs.
Psycho is offline   Reply With Quote
Old 10th March 2006, 13:45   #4
Senior - BHPian
 
Rahulk76's Avatar
 
Join Date: Sep 2005
Location: PNQ
Posts: 1,133
Thanked: 204 Times
Default Problem rectified

[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]
Rahulk76 is offline   Reply With Quote
Old 10th March 2006, 14:11   #5
Senior - BHPian
 
nitrous's Avatar
 
Join Date: May 2004
Location: UAE/Lon/Madras
Posts: 6,966
Thanked: 282 Times
Default

EGR?? IS that a Dicor or a scorpio CRDe??
nitrous is offline   Reply With Quote
Old 10th March 2006, 14:31   #6
Team-BHP Support
 
Zappo's Avatar
 
Join Date: Oct 2005
Location: Hyderabad
Posts: 5,648
Thanked: 1,997 Times
Default

Quote:
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.
Zappo is offline   Reply With Quote
Old 10th March 2006, 14:37   #7
Senior - BHPian
 
Rahulk76's Avatar
 
Join Date: Sep 2005
Location: PNQ
Posts: 1,133
Thanked: 204 Times
Default

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

Last edited by Rahulk76 : 10th March 2006 at 14:44.
Rahulk76 is offline   Reply With Quote
Old 13th March 2006, 01:06   #8
BHPian
 
turbo_c's Avatar
 
Join Date: Jul 2005
Location: Pune / Mumbai
Posts: 132
Thanked: 7 Times
Thumbs up

Well written explanation of EGR dude !

- T u r b o C -
turbo_c is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Opel Corsa Sail 1.6 - Damaged Exhaust pipe narula123 Technical Stuff 9 11th November 2011 22:40
Exhaust pipe gets coated brown after a run. What's wrong ? di1in Modifications & Accessories 10 23rd March 2009 16:26
Leak in Exhaust pipe- Help leadf00t Technical Stuff 12 25th July 2008 11:31
2006 GSX R600 What's with that exhaust pipe? spdfreak Superbikes & Imports 10 3rd December 2005 05:08
exhaust pipe sideways bhp Indian Motorsport 6 5th March 2005 00:10


All times are GMT +5.5. The time now is 11:50.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks