Occasional sluggish performance and puffs of black smoke.

AdrianC · Sep 18, 2013

Hi Guys,

I wonder if I can call upon your collective expertise once again.

On occasion I have a small problem when accelerating whereby I put my foot down, there is no increase in speed, the truck is sluggish and then suddenly it dumps a cloud of black smoke and then it takes off.

I normally notice it on roundabouts or junctions. I stop, pull away, change into second and then the problem occurs as I am going round the roundabout just after I change gears and am wanting to accelerate away.

:?

pdfisher · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

Black smoke is the most common smoke emitted from diesel engines. It indicates poor and incomplete combustion of the diesel fuel. There are many causes, including…
Incorrect timing
Dirty or worn injectors
Over-fuelling
Faulty turbocharger (ie not enough air to match the fuel)
Incorrect valve clearance
Incorrect air/fuel ratio
Low cylinder compression (eg sticking piston rings or worn components)
Dirty air cleaner
Restricted induction system (eg system too small or kinked inlet piping)
Other engine tune factors
Poor quality fuel
Excessive carbon build up in combustion and exhaust spaces
Cool operating temperatures

Couper · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

Fuel filter need changing maybe ?

pdfisher · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

or go for the MAF

Guest · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

Ark @ Fisherpedia :salute:
The force is strong in the WOZipedia training camp. :lol:

My answer... As he says :lol:
Start with fuel/air filters, maf sensor clean.
Does it rev ok at standstill or hocker on full pedal?

pdfisher · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

Biggi said:
Ark @ Fisherpedia :salute:
The force is strong in the WOZipedia training camp. :lol:

My answer... As he says :lol:
Start with fuel/air filters, maf sensor clean.
Does it rev ok at standstill or hocker on full pedal?

got to love copy and paste :lol: :lol: lifted off a diesel engine forum

AdrianC · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

Thank you Gents.

I think I can rule out the injectors as they were all taken out, cleaned and tested back in May over another issue.

I always use Shell or BP, occasionally Texaco but the latter is a very rare occurance.

Engine temperature is consistently just below halfway when warm.

Because of an issue back in May where I was emitting vast quantities of black smoke it might be a carbon build up somewhere as a result of that.

It idles fine, revs ok except for when changing up and accelerating and even then it's not consistent, it happens on occasion, not every time.

pdfisher · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

go with biggi route then

Guest · Sep 18, 2013

Re: Occasional sluggish performance and puffs of black smoke

AdrianC said:
Thank you Gents.

I think I can rule out the injectors as they were all taken out, cleaned and tested back in May over another issue.

I always use Shell or BP, occasionally Texaco but the latter is a very rare occurance.

Engine temperature is consistently just below halfway when warm.

Because of an issue back in May where I was emitting vast quantities of black smoke it might be a carbon build up somewhere as a result of that.

It idles fine, revs ok except for when changing up and accelerating and even then it's not consistent, it happens on occasion, not every time.

Do you have a DTE or pedal box fitted ?

AdrianC · Sep 19, 2013

Re: Occasional sluggish performance and puffs of black smoke

Not to my knowledge.

Occasional sluggish performance and puffs of black smoke.

AdrianC

pdfisher

Couper

pdfisher

Guest

pdfisher

AdrianC

pdfisher

Guest

AdrianC

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