Thread: Discovery 2 different smoke to others

Hi Adam, welcome to the forum.

I'm not a Td5 man so I'm not a lot of help.

However, does it give out a bit of smoke when you apply the throttle after a period of overrun, e.g., after running down hill on a trailing throttle?

Hmm, rethinking it, I don't know that one gets high vacuum conditions in a diesel. So I guess it doesn't smell like oil smoke?

The glow plug shouldn't be on when the engine is running so I doubt that's a cause.

white smoke usually equals steam,,
sorry.

Originally Posted by Pedro_The_Swift

white smoke usually equals steam,,
sorry.

White smoke in a diesel can indicate unburnt fuel. Usually at startup though. No glow plugs as engine is warm so plugs are off. Leaky injector if at idle perhaps? Ie letting too much fuel in that the engine can't burn at idle; not there under throttle as fuel is required. What the fuel usage like? Perhaps try some good injector cleaner (i use fuel cleaner concentrate from cost effective) and see if it stops?

I thought unburnt would be black,, sorry
This from Berrima Diesel,,

"White smoke
MOST COMMON CAUSE:
INCORRECT IGNITION TIMING
As a general rule, the first cause of a diesel that's blowing white smoke will be related to the injector pump timing. Diesels rely heavily on high compression and correct injector pump timing to fire the combustion cycle. Any reduction in the cylinder pressures or fuel delivery will result in an incomplete combustion process. That white smoke you see from the exhaust is raw or completely unburnt fuel.
?Air entering the fuel line or blockages in the filter are common problems that lead to low injector pump pressures,? Andrew says. ?A diesel that has the incorrect injector pump pressures can sound quieter than normal and tends to splutter as you try to rev the engine. Bad injector spray patterns have been known to cause white smoke too. This comes about when the engine attempts to burn through dribbling injector droplets when it's not atomising the fuel correctly. Dribbling injectors tend to make the engine noisier than normal and also can contribute to black smoke problems.?
A drop in compression can also contribute to white smoke from the exhaust and can be from a number of different situations. A worn high-kilometre engine, weak compression rings, a blown head gasket or even the incorrect head gasket being used during a rebuild ? they've all been known to cause a diesel to chug white smoke. Along with white smoke from the exhaust, the engine is likely to be down on power and difficult to start.
?Aside from the typical causes of white smoke, we've seen a number of customers who have been caught out when rebuilding their diesel engine. One particular customer came to us after having the 1HZ engine in his 80 Series ?Cruiser rebuilt, as it was now blowing white smoke,? Andrew says.
?After diagnosing it, it was found that the parts supplier the owner used neglected to inform him that there is more than one thickness head gasket available for his engine. Subsequently, a thicker gasket was supplied, creating the sensation of a low-compression engine. All the owner's hard work of rebuilding it was undone.?
White smoke from the exhaust is notorious in older diesels with rotary injector pumps, as they're adjusted to perform at specific pressures. Common-rail diesels will typically stop running if pump pressures are restricted as they operate between finer tolerances. In many cases, diagnosing white smoke from the exhaust should start with a thorough tune, with correct injector pump adjustment a high priority."

Originally Posted by Pedro_The_Swift

I thought unburnt would be black,, sorry
This from Berrima Diesel,,

"White smoke
MOST COMMON CAUSE:
INCORRECT IGNITION TIMING
As a general rule, the first cause of a diesel that's blowing white smoke will be related to the injector pump timing. Diesels rely heavily on high compression and correct injector pump timing to fire the combustion cycle. Any reduction in the cylinder pressures or fuel delivery will result in an incomplete combustion process. That white smoke you see from the exhaust is raw or completely unburnt fuel.
?Air entering the fuel line or blockages in the filter are common problems that lead to low injector pump pressures,? Andrew says. ?A diesel that has the incorrect injector pump pressures can sound quieter than normal and tends to splutter as you try to rev the engine. Bad injector spray patterns have been known to cause white smoke too. This comes about when the engine attempts to burn through dribbling injector droplets when it's not atomising the fuel correctly. Dribbling injectors tend to make the engine noisier than normal and also can contribute to black smoke problems.?
A drop in compression can also contribute to white smoke from the exhaust and can be from a number of different situations. A worn high-kilometre engine, weak compression rings, a blown head gasket or even the incorrect head gasket being used during a rebuild ? they've all been known to cause a diesel to chug white smoke. Along with white smoke from the exhaust, the engine is likely to be down on power and difficult to start.
?Aside from the typical causes of white smoke, we've seen a number of customers who have been caught out when rebuilding their diesel engine. One particular customer came to us after having the 1HZ engine in his 80 Series ?Cruiser rebuilt, as it was now blowing white smoke,? Andrew says.
?After diagnosing it, it was found that the parts supplier the owner used neglected to inform him that there is more than one thickness head gasket available for his engine. Subsequently, a thicker gasket was supplied, creating the sensation of a low-compression engine. All the owner's hard work of rebuilding it was undone.?
White smoke from the exhaust is notorious in older diesels with rotary injector pumps, as they're adjusted to perform at specific pressures. Common-rail diesels will typically stop running if pump pressures are restricted as they operate between finer tolerances. In many cases, diagnosing white smoke from the exhaust should start with a thorough tune, with correct injector pump adjustment a high priority."

TD5s don't have injector pumps Pedro

Sent from my SM-G900F using AULRO mobile app

well there you go,,
so that whole page has no redeeming qualities?

Originally Posted by Pedro_The_Swift

well there you go,,
so that whole page has no redeeming qualities?

IMO it has, the Td5 doesnt have a HP injection pump like the TDIs but actually it has 5 ''injector pumps'' ... cos that's what the EUI's are, they are called PD(pumpe duse) in similar german engines, and off course there is a timing for them too, and compression as well, etc... so IMO what you posted is correct and can be valid for Td5 too by analogy... in a nutshell, white smoke is bad news what ever it causes it

Valve stem seals / guides may be showing their age , get someone to give it a rev while you stand behind and smell ...... Does it smell like burning oil?, the smoke can appear whitish . also check turbo for excessive play .
And make sure you can't smell diesel in the oil
Cheers