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


Reply
 
Thread Tools Search this Thread
Old 6th February 2009, 12:06   #1
BHPian
 
RedOne's Avatar
 
Join Date: Sep 2004
Location: Bangalore
Posts: 310
Thanked: 19 Times
Default White / Blue smoke - Diesel engine

Greetings!

My Landcruiser has recently started blowing out a cloud of white/blue smoke when starting after standing idle for 2-3 days. More gap results in more smoke. After the initial puff, the smoke persists for 2-3 kms more but only on accelerating and then dissapears. Under heavy acceleration, say in 3rd to redline, it does blow out some black smoke but I guess that is normal.

There is no other problem with the engine: No loss of power, starts easily, no oil leaks etc. and gives consistant mileage as before.

Details of the truck:
97 LC 80
1HDT engine (4200cc turbo diesel, in-line 6, 12 valves)
Done 86K kms as per odo but could be a bit more

Any suggestions as to what could be the reason for the white smoke? My regular shop tells me to leave it alone as the engine is strong otherwise.

Gears,
Red-One.
RedOne is offline   Reply With Quote
Old 6th February 2009, 12:16   #2
Senior - BHPian
 
suman's Avatar
 
Join Date: Sep 2005
Location: Gurgaon
Posts: 4,589
Thanked: 257 Times
Default

Injectors OK? Any abnormal Turbo noise (whine)?
suman is offline   Reply With Quote
Old 6th February 2009, 12:54   #3
Senior - BHPian
 
vikram_d's Avatar
 
Join Date: Jul 2006
Location: Bangalore
Posts: 2,380
Thanked: 936 Times
Default

White/blue smoke is very typical of oil burning. Monitor engine oil levels for a few days.
vikram_d is offline   Reply With Quote
Old 6th February 2009, 13:05   #4
Senior - BHPian
 
Join Date: Sep 2007
Location: New Delhi
Posts: 3,083
Thanked: 252 Times
Default

Has the engine been re-built ever before?
White smoke can also result due to combustion with excess air. Blue is usually oil burning.
anupmathur is offline   Reply With Quote
Old 6th February 2009, 13:19   #5
Team-BHP Support
 
Jaggu's Avatar
 
Join Date: May 2004
Location: Bangalore
Posts: 17,752
Thanked: 7,475 Times
Default

Check its not a good sign, there is some contamination if oil/water lines at some point. Early diagnosis will save you from big pain later on.
Jaggu is offline   Reply With Quote
Old 6th February 2009, 14:06   #6
BHPian
 
RedOne's Avatar
 
Join Date: Sep 2004
Location: Bangalore
Posts: 310
Thanked: 19 Times
Default

Suman,
Don't know about injectors; I guess it need to be checked on a test rig. Turbo is normal.

Vikram,
No drop in oil level, so I guess it's a small amount of oil which is getting burnt. As mentioned, it does not happen after 2-3 kms.

Anup,
I bought the truck 2 years back so not sure if it's been rebuilt before.

Jaggu,
No oil/water mixing, if that's what you meant.

Gears,
Red-One.
RedOne is offline   Reply With Quote
Old 6th February 2009, 14:10   #7
Team-BHP Support
 
theMAG's Avatar
 
Join Date: May 2006
Location: Long Island, NY
Posts: 7,034
Thanked: 1,471 Times
Default

Since its a 12-year old diesel, pl check the problem others have mentioned - oil burning.
theMAG is offline   Reply With Quote
Old 6th February 2009, 14:11   #8
Senior - BHPian
 
Join Date: Sep 2007
Location: New Delhi
Posts: 3,083
Thanked: 252 Times
Default

Quote:
Originally Posted by RedOne View Post
I bought the truck 2 years back so not sure if it's been rebuilt before.
In that case, you cannot be complacent about this. Symptoms are not happy.
Either brace yourself for some maintenance (expensive!) or get rid of this truck!
anupmathur is offline   Reply With Quote
Old 12th February 2009, 10:53   #9
BHPian
 
RedOne's Avatar
 
Join Date: Sep 2004
Location: Bangalore
Posts: 310
Thanked: 19 Times
Default

Thanks guys, for your responses.

Just an update:

I checked with someone who knows LC engines. Apparently the smoke only on startup is due to oil seeping into cylinder from valve opening while left for long time. Could be due to valve seat wear or because valve clearance adjustment is due.

Will get it looked into.

Gears,
Red-One.
RedOne is offline   Reply With Quote
Old 8th January 2012, 14:04   #10
BHPian
 
tbppjpr's Avatar
 
Join Date: Nov 2011
Location: India
Posts: 587
Thanked: 479 Times
Default re: White / Blue smoke - Diesel engine

After searching on the community for a while I found this thread title suites everyone who has a diesel car and faced issue of white smoke while cold start, so putting my my query here.

Introduction:
I have a Polo 1.2 TDI, bought in April'11 and has done 6800 kms so far. My driving is less, sometimes car left parked for 2-3 days and sometimes it is not touched even for a whole week. I always got filled Hi-Speed diesel from my favourite COCO BP fuel station so far. Current diesel in the tank is normal which was filled at a highway bunk.

Symptoms :
Weather is getting very cold these days and I noticed white smoke first time few days back when started my after putting back the engine oil stick into the chamber after checking oil levels, oil got reached to bottom mark. Now it has become common these days to get white smoke from the exhaust for few seconds., after few seconds car gets normal and no smoke from exhaust.

Called workshop when first time got the white smoke, they told me that its normal to get white smoke from a diesel car in cold mornings.

I am still curious to know if anything serious is there ? Please help.
tbppjpr is online now   Reply With Quote
Old 9th January 2012, 01:12   #11
BHPian
 
Join Date: Jul 2010
Location: JAIPUR
Posts: 27
Thanked: 17 Times
Default re: White / Blue smoke - Diesel engine

I think that white smoke in winters during start up is due to temperature being lower than required for proper combustion of diesel. Its quite common to see my 107k kms old indica emitting white smoke during start up in winters, but after idling the car for 4-5 minutes the smoke stops .
BLACK1 is offline   (1) Thanks Reply With Quote
Old 9th January 2012, 21:13   #12
BHPian
 
tbppjpr's Avatar
 
Join Date: Nov 2011
Location: India
Posts: 587
Thanked: 479 Times
Default re: White / Blue smoke - Diesel engine

Quote:
Originally Posted by BLACK1 View Post
I think that white smoke in winters during start up is due to temperature being lower than required for proper combustion of diesel.
I also think so as my car is relatively new and its her first winter season, workshop guys also told me the same but I am afraid about the fact that white smoke is symptom of engine oil burning, low oil levels or water in fuel lines etc. So worried about these facts, how do I confirm that its just normal cold start smoke.

Quote:
Originally Posted by BLACK1 View Post
Its quite common to see my 107k kms old indica emitting white smoke during start up in winters, but after idling the car for 4-5 minutes the smoke stops .
My car is just 6800 kms old and the smoke appears just for few seconds, after that there is no sign of smoke. Sometimes smoke doesn't appear if I parked the car in last night and start in next morning, it only appears if I don't drive the car for a longer period like one day gap between last and next drive.
tbppjpr is online now   Reply With Quote
Old 10th January 2012, 00:38   #13
BHPian
 
Join Date: Jul 2010
Location: JAIPUR
Posts: 27
Thanked: 17 Times
Default re: White / Blue smoke - Diesel engine

Engine oil burning is usually indicäted by light blue smoke & if such smoke appears only during startup irrespective of the weather conditions then its due to worn valve guides & seals. This leads to reduction in oil level.
BLACK1 is offline   Reply With Quote
Old 10th November 2014, 14:55   #14
BHPian
 
akhilesh51's Avatar
 
Join Date: Jan 2009
Location: Jaipur, RAJ
Posts: 628
Thanked: 321 Times
Default Audi Q5 2.0TDi white smoke at idle

Need some help from BHP gurus.

I have recently purchased Audi Q5 2.0 TDi and have encountered a weird phenomenon which I have been told by the service centre people to be common with all Audis.

During the course of last month (Purchased the vehicle in Oct 2014), Twice we have encountered heavy white smoke from exhaust at engine idle. Once it happened when the vehicle was idle at traffic light and again yesterday when idle when I reached home at night and vehicle was idling just before switching off. I have not pushed the vehicle to its limit (it has run 2000 kms in total) since purchase and have largely used the car for short trips 10-20kms barring a 700 km trip 5 days back.

The volume of smoke encountered both these times was highly abnormal and never encountered in any of our other vehicles including a 2009 VW Jetta that we have owned since last 6 years. It was white in colour and odourless. There is no apparent leak in coolant or oil as checked by the technicians. The smoke reduced and then hen completely smoke when vehicle was accelerated at idle itself or driven.

Now, a visit to service centre and after standard checks, we were told that all recent Audis have been fitted with a catalytic converter which stores exhaust waste in order to reduce pollution in cities and release the smoke at periodic intervals or when the vehicle is being constantly driven above 80KMPH (i.e on highways).

I want to confirm if this is true or there is a back story to this whole thing.

Last edited by akhilesh51 : 10th November 2014 at 14:57.
akhilesh51 is offline   Reply With Quote
Old 10th November 2014, 15:03   #15
Team-BHP Support
 
Akshay1234's Avatar
 
Join Date: Dec 2006
Location: Mumbai
Posts: 9,760
Thanked: 6,670 Times
Default Re: Audi Q5 2.0TDi white smoke at idle

What they tell you is true. Actually you should give your car the beans once every few days to clear all that out. If used mainly on short trips as you have, and if not revved much this happens.
Akshay1234 is offline   (1) Thanks Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pulsar 180 Engine Overheating, emits White Smoke - Please help para_7k Motorbikes 36 20th April 2017 20:38
White smoke from engine oil dipstick ricky_1605 Technical Stuff 14 26th February 2017 19:13
white smoke from exhaust...its Turbo baleno neo_trace Technical Stuff 41 28th March 2015 11:39
Esteem 2001 White smoke on Cold start Slick Technical Stuff 9 3rd April 2008 02:16


All times are GMT +5.5. The time now is 17:56.

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