Perth VDJ200 with Exploroz sticker

Submitted: Monday, Oct 14, 2013 at 11:45
ThreadID: 104711 Views:2119 Replies:2 FollowUps:5
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Just been following a white 200 with two Mickey Thompsons and a roof camper-not sure if you know how much black smoke its putting out on every gear change and take off-id be checking it out if it was mine, maybe as simple as a dirty air filter?
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Reply By: Tim HJ61 (WA) - Monday, Oct 14, 2013 at 13:17

Monday, Oct 14, 2013 at 13:17
Blocked air filter usually creates white smoke, but anything is possible.

Sounds like they might have fitted a simple ECU mod chip that clumsily simply raises rail pressure only and results in more power, but with the downsides of too much smoke, poor idle and a risk of too high EGT.

Something like a UniChip that takes many parameters and a new map is created that leaves fuel at idle as standard and only winds in more when the engine/turbo combination can make best use of it according to load, temps, throttle position, boost, gear selection etc etc.

Tim
AnswerID: 519682

Follow Up By: fisho64 - Tuesday, Oct 15, 2013 at 09:11

Tuesday, Oct 15, 2013 at 09:11
not quite correct there Tim.
Black smoke generally from lack of oxygen causing incomplete combustion i.e blocked air filter, dodgy turbo or possibly injectors, maybe low compression etc

White smoke generally incomplete combustion from too low combustion temps-classic cause is a stuck or removed thermostat
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FollowupID: 799953

Follow Up By: Tim HJ61 (WA) - Tuesday, Oct 15, 2013 at 10:23

Tuesday, Oct 15, 2013 at 10:23
B.....rima Diesel
http://www.berrimadiesel.com/home/diagnosing-diesel-smoke/

"Why do diesels smoke then? Well, for various reasons. Firstly, black smoke is generally from over-fuelling of some sort and usually that means the fuel adjustment of the injector pump is set too high. Other causes can be low injector pressures coupled with poor fuel atomisation. The low fuel pressure means that the injector is letting in more fuel and low pressure, usually making for a poor spray/atomisation. In the end, black smoke means that the combustion process has had too much fuel for the air available. Other colours of smoke, such as white or blue, are more connected with engine condition or more major injection system issues. Think of white smoke as ‘steam’. If diesel fuel is put in too late due to very retarded timing or if compression is low, some fuel particles will only be warmed up and so you will get white smoke from that.

...a smoking diesel is abnormal and should be attended to by a specialist can address the various causes of it."

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FollowupID: 799959

Follow Up By: fisho64 - Tuesday, Oct 15, 2013 at 10:28

Tuesday, Oct 15, 2013 at 10:28
Umm did you read what you cut and pasted?

"the end, black smoke means that the combustion process has had too much fuel for the air available"

"Think of white smoke as ‘steam’. If diesel fuel is put in too late due to very retarded timing or if compression is low, some fuel particles will only be warmed up and so you will get white smoke from that."
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FollowupID: 799960

Follow Up By: Tim HJ61 (WA) - Tuesday, Oct 15, 2013 at 10:53

Tuesday, Oct 15, 2013 at 10:53
Yes I did. I thought it would be helpful. Just like you were trying to be helpful alerting the owner of the 200.

Too much fuel for the air available is different from poorly heated and partially burnt fuel.

Whatever..... smoke as you described is abnormal and yes the owner needs to resolve it.
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FollowupID: 799962

Reply By: Ron N - Monday, Oct 14, 2013 at 13:46

Monday, Oct 14, 2013 at 13:46
You can get away with visible smoke on acceleration after gear changing - provided it doesn't last for longer than 10 seconds.

A traffic cop will soon let him know if he's illegal. Visible smoke for more than 10 seconds will get him a ticket!

http://www.dec.wa.gov.au/index2.php?option=com_docman&task=doc_view&gid=3810&Itemid=1

IMO, a properly fuelled diesel should never emit more than a very slight dark haze of smoke under full throttle application.
Anything more than that means wasted fuel and soot buildup in your engine, resulting in increased wear and a need for more frequent oil changes.
AnswerID: 519684

Follow Up By: Member - johnat - Monday, Oct 14, 2013 at 20:02

Monday, Oct 14, 2013 at 20:02
You're assuming the copper sees him! I despair sometimes - drivers with NFI and not a copper in cooee! Maybe I'm only ever about at coffee break time?
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FollowupID: 799914

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