Log in Register. Search titles only. Search Advanced search…. What's new New posts Latest activity. Search forums.

cold start white smoke diesel

Members Current visitors. Log in. Install the app. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Hi Last summer i was having problems with my car i wouldn't able to go past 3k it was like hitting a brick wall,it had a service done and they replaced the fuel filter and this is when i had those problems,They agreed to replace the fuel filter with a oem filter and i hadn't had the problem since,But i also thought it could be something to do with tescos fuel,So ever since i had the oem fuel filter put in i changed fuels either Esso or Sainsburry fuel,Never had any problems untill two weeks ago thats when i had to fill up with tescos fuel,Everything was fine until two days later after filling up it was cranking alot more to start up then it ran rough lumpy but after a few seconds it ran fine.

The next day it started fine but the lumpy start has been happening ever since it runs fine on idle after a few seconds,But this morning i looked out the back when it was running lumpy and i saw grey white smoke coming out of the exhaust which just lasted a few seconds. Warm starts its fine and when ive stopped i dont see any smoke coming out.

Should you be getting that on a diesel? Also any ideas on the lumpy cold start sounds like its going to stall but it clears after a few seconds. I am trying to get rid of the tescos fuel as fast as i can,So then i can fill it up with esso and see if thats the cause. What car and engine? This issue only when starting cold seems more likely to be lack of pre heat where ever that engine has it.We are going to cover the main types of diesel smoke and the causes in this article.

Grey/White smoke on cold start from a diesel

If you are trying to diagnose an issue take a look at the reference to dash down to your particular problem. So, you have some black smoke billowing out of your exhaust. Nothing more fun to a diesel guy than seeing a Prius with the windows down and blowing a bunch of black smoke that way. Diesel engines are known for blowing black smoke during acceleration but, is that bad? Is it a sign of trouble? What causes black smoke? What does Black smoke from a diesel engine mean?

Black smoke occurs when partially burned fuel passes through the combustion chamber. Normally, an engine burns fuel completely and emits water and CO2. Black smoke indicates that something is causing the fuel to only burn partially. Whether or not is bad for your engine depends on what the cause of the black smoke is. A little black smoke is normal on a properly functioning diesel enginebut if the amount of smoke changes at different RPMs and loads you have an issue.

Here are the things it could be and then we will go into what to look for and steps to diagnose the problem…. There is a delicate mixture of air and fuel that needs to be achieved in order to have a clean burn from your diesel engine. When you are having black smoke, the balance has not happened. Air restriction is the most common cause of black smoke.

So, where is the restriction? How dirty is it? When is the last time you opened it up and looked at it? It is an indicator for your air filter and should be changed when it reaches a specified mark. That could be it!

Check your inlet piping. Is one collapsed? Look for anything abnormal in the hosing. Run the engine while you are looking like a weak hose may suck together when operating. Anyway, you get the idea. Look for obstructions to air freely flowing into the engine intake. Look at all the piping around the turbocharger and intercooler. Listen when the engine is under a load and sometimes it will squeal and let you know that there is a leak somewhere. Tighten all the connections.

They can always use a little quarter turn. Listen for abnormal noise from the turbo itself. When you have the hose removed give the turbine and wiggle.

Inspect the entire exhaust and DPF system. Look for any crushed or damaged parts. It is easy to damage when you have a driver who likes running over things.

Causes of Diesel Engine Smoke - By Color

Modern engines have control units that actively measure air mass and make appropriate adjustments. You could have a sensor giving bad information to the module.So, you have some white smoke billowing out of your exhaust. What is the cause? Maybe you are like me and have to look it up every time. No shame here. The answer is quite simple, but the solution might not be.

7 Causes of white smoke from exhaust on startup, when accelerating & Idle

There are three main reasons for white smoke from a diesel engine. Raw diesel fuel that passes through the exhaust completely unburned 2. The temperature in the combustion chamber is too low.

Here is how to read the smoke…. This is very common. It will often happen at startup in cold weather with lower compression engines. As you start running the engine at idle around or rpmyou will achieve a more effective compression ratio, and the smoke clears.

White smoke has a lot to do with the temperature in the combustion chamber. If the smoke is really just a puff, there is not much to worry about. Especially if it has been sitting, it could just be built up condensation. Some of the likely causes include. Remember, if you have an older engine with really low compression and bad timing or low injection pressure, you are more likely to have white smoke. Water or coolant can cause white smoke from diesel as well.

This is a symptom of a bad problem. You are getting coolant or water in the combustion chamber, and If you know anything about compressing water, you know this is no going to end well. Spoiler - water does not compress. So, if you have this problem, be careful running it for any period of time. This will be a steady stream of smoke after starting up. Some likely causes include. Remember, significant damage will occur if you run the engine with water in the combustion chamber. To run correctly, a diesel engine needs precise timing of the injector pump and proper pressure.

Any decrease in the pressure or delay in delivering the fuel to the combustion chamber will cause incomplete combustion, and you will have white smoke. This is a steady stream of lighter white smoke. Modern diesel engines are designed to deliberately over-fuel the engine or just one cylinder for brief periods to create heat to burn carbon off of the Diesel Particulate Filter or DPF.

If this over-fueling operation is not operating properly, it can cause white smoke and damage to the engine. White smoke can be difficult to diagnose but, if you follow the signs and look at the simple things first, you can get to your answer fairly quickly. The damages that can occur from the problems denoted by white smoke can be catastrophic, but you can likely avoid even more costly repairs if you can catch it early.

Looking for a complete diesel smoke guide? If the fuel is contaminated with water or some other foreign material, it may produce white smoke. The best way to test the fuel is to pull the filter and empty the fuel from it into a clear glass or container.For cars to move forward on the road, these must continuously deplete gases from the engine to their exhaust. After a fuel with a mixture of air is supplied power to the engine through combustion, it has to be dumped off so a new mixture can be combusted in the cylinders.

White smoke from exhaust on startup: 3 Possible causes & How to fix

Visible smoke is a sign that you need to get your car checked. However, there are instances where you would see exhaust emissions with colors usually in black, white, or blue. When your car emits colored smoke, then you know something has to be checked or inspected inside your engine. For the most part, colored smoke is not normal and it is a sign of engine component failures. Vehicles with a diesel engine are more likely to emit black smoke.

In areas where the climate is usually cold, then white smoke is normally emitted due to condensation on startup. This is why it is recommended to keep the engine warm-up for a few minutes before driving away.

However, if your car continuously emits white smoke after getting your engine warmed up already, then your engine could have faulty components.

If you also live in areas where the climate is generally hot and you see white smoke, then it means you need to get your car inspected. This ensures to keep the mixture correct so your engine will not combust lean or rich mixtures, hence keeping your engine running in an ideal condition. Running with faulty injectors will result in bad fuel consumption and loss of power for accelerating.

Over time, seals wear or break off as these components face high temperature and pressure every time the engine is cranking. Once it starts leaking, you can expect fluids to enter your combustion chamber which results in the emission of white smoke.

The most common fluid that causes the emission of white smoke is the presence of coolants or water in the cylinder.

Either way, you should have your car checked to avoid further damage due to leaking. A gasket, or a seal, is used to thoroughly achieve a metal-to-metal contact from two different engine components. If your intake gasket is faulty, then coolants are likely entering the intake portion of your cylinder head and later to the combustion chamber.

It is important to check this first to avoid removing other components that are more complex to reassemble. If you see that your intake gaskets are damaged, then replace them even if it is minimal.

Follow the same pattern as the previous gasket. The damage will increase which will cause more coolants to enter the combustion chamber. After checking the intake gasket and you see no faults, you can proceed to inspect the head gasket. A head gasket is one of the most important parts of your engine as it seals the cylinder head that houses the valves to the engine block that houses the pistons. Without a head gasket, your coolants and engine oil will enter your cylinders.

Inspect the head gasket whether it is already blown. If it is, then have it replace before hitting the road to avoid emitting white smoke.

Running with a blown head gasket will wipe out your coolants which results in engine overheating. Both the cylinder head and engine block house the components needed to run a car.Diesel smoke like blowby and oil use is a worrying engine symptom which indicates that an engine is not running well, and its service life is likely to be shortened considerably, unless remedial action is taken.

Basically, smoke from a diesel engine indicates that something is not right. It should be taken as an indication that there is a problem existing or developingthat will potentially shorten the engine life, or result in unnecessary costs. It should be regarded as an opportunity to take measures that will save you money in both the long term and also the short term.

At the least, that smoke may be due to a simple problem, that is causing poor combustion efficiency, and costing you in excessive fuel bills eg carboned up engine from excessive idling, stop start operation or short run times. At the other end of the scale, it may be your last chance to act, before a catastrophic engine failure occurs eg piston seizure, valve or turbocharger failure. A diesel engine in good condition should produce no visible smoke from the exhaust, under most operating conditions.

A short puff of smoke when an engine is accelerated under load may be acceptable, due to the lag before the turbocharger speed and air flow is able to match the volume of diesel injected into the cylinders. That would only apply to older technology diesel engines, but with modern type diesels, no smoke at all should be evident. There are three basic types of smoke, as identifiable by their colour.

And then there is blowby smoke or just blowby. It indicates poor and incomplete combustion of the diesel fuel. There are many causes, including. Obviously, worn or damaged components must be replaced, and the earlier you identify and fix the problem, the less damage will be done. Keep on top of engine tune issues, including valve adjustments, and regular servicing of air, fuel and oil filters.

cold start white smoke diesel

Do not buy fuel from suspect outlets. Dirty components, such as injectors can be easily restored to full cleanliness by using an effective and reliable fuel system cleaner. If you choose from our range of products, Cleanpower is what you need. Common rail diesels are the new hi-tech breed of diesel to meet ever increasing emission standards.

Operating pressures and temperatures are several times higher than older technology, and tolerances are much finer, making them more susceptible to fuel and deposit issues. Injectors and pumps are naturally more expensive, but problems can, and do, melt pistons and destroy engines. Cleaning of internals of engines has usually only been possible at overhaul, however, Cost Effective Maintenance provide two products to enable vehicle and equipment owners to quickly, safely and cheaply restore full cleanliness to combustion and exhaust spaces FTC Decarbonizer as well as piston rings, oil pumps, oil galleries, oil coolers, piston skirts, valve gear, etc Flushing Oil Concentrate.

Black smoke is high in carbon or soot, which is an undesirable product of diesel combustion. Now, the combustion of diesel is a complicated process of breaking down the various hydrocarbon fuel molecules into progressively smaller and smaller molecules, by burning in the presence of oxygen. The main and ideal end products of combustion are CO2 and H2O carbon dioxide, the greenhouse gas and water.

It is believed that the last step in the process is carbon monoxide the poisonous gas to carbon dioxide. This is also the slowest step by far, and when combustion conditions deteriorate some upstream bottle necking occurs in the chain of combustion reactions.

This results according to some authorities in polymerization of smaller partly burnt molecules into much larger ones, which become visible as soot, or black smoke. The oil can enter the combustion chamber for several reasons. At cold start, blue smoke is often evident, and can reflect reduced oil control, due to fouling deposits around piston rings or cylinder glaze which is actually carbon deposited in the machined cylinder crosshatching.

These tiny grooves actually hold a film of oil, which in turn completes the seal between the combustion chamber and the oil wetted crankcase.

Blue smoke should not be evident at any time, but it is worth noting, that engines with good sound compression can actually burn quite a lot of oil without evidence of blue smoke.A brand new diesel engine running at full load will experience a little bit of blow-by upon startup. Blow-by is a condition where diesel fuel, air and vapor are pushed past the rings into the crankcase of the engine.

cold start white smoke diesel

Correct pressure should be maintained in the cylinder chamber in order for proper combustion to occur. In a new diesel engine the rings need time to seat properly and develop an air-tight seal.

After a short period of break-in hours under load, the blow-by problem should correct itself. Consequently, a proper running diesel engine should produce no visible smoke from the exhaust.

If there is smoke coming from the exhaust it could indicate a more serious problem with the engine. This article will help diagnose the underlying causes of diesel engine smoke. Diesel engine smoke comes in three colors: white, black and blue. Consistent smoke coming from the exhaust most likely indicates a deeper internal problem with the engine.

Newer electronic diesel engines with common rail injectors simultaneously match the speed of the turbo with the metered flow of diesel fuel into the cylinder.

White smoke coming from the exhaust usually points to one point of failure: the injectors. Usually, white smoke indicates that the diesel fuel is not burning correctly. Unburned diesel fuel will make its way through the exhaust completely unused. Be careful of white smoke as it will irritate your eyes and skin.

If white smoke occurs during a startup in freezing temperatures, then goes away, it usually indicates frozen deposits of soot which expanded around the rings then burned away once the engine warmed up. Black smoke, unlike white smoke, contains a high concentration of carbon exhaust particles. The combustion of diesel fuel in the cylinders breaks down the long chain of carbon molecules to smaller and smaller molecular chains.

When the exhaust leaves the engines the byproduct is a combination of carbon dioxide and water. If something goes wrong during combustion the chemical reaction taking place is not as robust, causing long tail hydrocarbons to be left completely intact and then expelled in the form of smog or soot. Partial burning of diesel fuel results in large carbon dioxide particles as well as greenhouse gasses which contribute to air pollution.

The advent of the Selective Catalytic Converter, Diesel Exhaust Fluid and Diesel Particulate Filter all helped to regenerate exhaust back into the combustion chamber to further break down particulate matter. Diagnosing Causes of Diesel Smoke at Capital Reman Exchange Black smoke is the most common smoke color coming from a diesel engine and most likely indicates something is wrong during the combustion of the diesel fuel.

When diagnosing the problem the first place to look at is the mixture of air and fuel flow into the cylinders. The engine could be delivering too much fuel, not enough fuel, too much air or simply not enough air. Blue engine smoke is the rarest type of smoke emanating from a diesel engine.

The presence of blue smoke is an indication of burning oil. Blue smoke should not be ignored but is common when starting an engine in a cold weather. The oil thins out when it is cold and some could escape into the cylinder and be burnt. Cold temperatures can cause older more worn rings to unseat just a bit due to deposits found around the rings or cylinders. Cylinder glaze, or the smooth deposits left behind from the piston going up and down, can also build up over time and burn.

The seal between the combustion chamber and crankcase should be completely sealed after the initial break-in period. The use of Lubriplate or Molybdenum Disulfide during the engine rebuild will help the rings to seat properly during initial startup as well as burn off any carbon deposits.

A properly working and maintained diesel engine should produce no visible smoke.When you notice any kind of smoke from your exhaust be it white smoke from exhaust on startup or when accelerating and even when idle, they all are indications that, your vehicle is having one issue or the other which need your attention.

How serious this will be, is totally dependent on the colour and type of smoke that is coming out. In most cases, smoke coming out of exhaust are usually due to condensation accumulated within the exhaust. Smoking is not limited to startups, you may also see white smoke from exhaust when accelerating and on rear cases, you may as well see white smoke from exhaust when idle.

There is a special scenario where white smoke on startup then disappears, we will talk about this here in this post.

Big BUS Diesel Engines Cold Start Up HEAVY SMOKE and SOUND 💨💨💨

But you must recognize that the information we share here, are of general note and so on special cases, you need expert mechanic advice that is specific to your circumstance and condition in other to fix or rectify the problem.

So if your turn on your car especially gas engine cars, then you see white smoke from exhaust on startup, there are a couple of reasons this is coming out, but you need to know on normal circumstances white smoke is t harmless.

However, there are times when it becomes a cause for concern and so we need to quickly sort for fix the problem yielding the smoke various condition. Related Article: How to Remove white smoke from exhaust when starting car. White smoke coming out of exhaust pipe might result due to so countless reasons however when you see white smoke from exhaust at startup, just know that your car is probably are having one of the following issues below:.

So the reason any of the above issues may lead to smoke coming out of your exhaust pipe is because when there is a fracture on the engine block, head gasket or cylinder head, it allows coolant to start leaking into the car engine combustion system and the cylinders which then alters then normal operating system of the car and this is very unsafe for the engine and could damage the engine on long run.

That is why we recommend you seek for a solution the moment you notice white smoke whether it is the normal one that is harmless or not. Just look for a mechanic to run check on the car, or better still do it yourself. The main cause of smoke from exhaust when accelerating is due to a burning coolant or transmission fluid problem. When the white smoke is as a result of transmission fluid, it means that the car engine is likely absorbing excess fluid from the vacuum pipe or hose which is what makes it produce white smoke.

This issue will also make the exhaust to produce a smell like a burned oil so you should look out for this as well. If the white smoke is caused due to coolant, then it very much likely that your car has a cracked cylinder head. To check this, you want to run a pressure test on the vehicle coolant. Observe if they are low and if the car engine is excessively heated up.

If it is overheating then it is a coolant problem with low coolant, but if it is not overheating then your car head gasket is leaking. If transmission fluid is the problem, you need to fix this by changing out the transmission vacuum modulator valve. But before changing it, you have observed fluid level to see if it is low or at its normal level. If it is below the normal level, you only need to add more transition fluid to meet the required amount.

So in a case where you notice white smoke from exhaust when idle or stopping your car, it simply means that there is oil within your car combustion chambers. The presence of oil in the combustion engine burns off your car exhaust system which makes your smoke as one of the many symptoms it might present other than smoking.

The easiest way to identify this as the problem is to notice the white smoking coming out when idle and then you also want to observe that what is burning is oil and not gasoline. Gasoline burns explosively while transition fluid are subtle.


Replies to “Cold start white smoke diesel”

Leave a Reply

Your email address will not be published. Required fields are marked *