Duramax smokes when accelerating

Duramax smokes when accelerating

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The problem has occurred half a dozen times over the past year. Always on the second day of a long trip pulling a Travel Trailer.

Diesel Tech Questions: White Smoke

I apologize for the lengthy post, but too ignorant to know how to simplify. In each case I was cruising along an interstate at about 70 MPH with cruise control engaged when the cruise control disengaged, check engine light came on, and the speed slowed.

If at highway speed when it occurs I can achieve speeds of MPH down hill and up hill. However, if I stop and try to accelerate again the truck will do maybe MPH. Engine will not exceed 2, RPM. Code indicates low fuel pressure. Limped to Chevy dealer where code read and fuel filter changed.

Truck ran fine for next hour then lost power again, but started to run normally before I could exit the interstate only to reoccur as I did exit the interstate for the RV Park to stay the night.

Next morning I headed to shop but truck was running normally so unable to determine issue. No further occurrence until the trip home in Sept. On second day of trip same situation; interstate 70 MPH with cruise control engaged and suddenly cruise control disengaged, check engine light on and loss of power, speed.

Almost too RV Park for night so limped there. Next day truck ran normally. I had made a dozen trips pulling the TT 3 to 6 hours each way with no further problem until yesterday.

Returning from a trip to WI, headed home to GA, second day of driving, when truck suddenly lost power. Did a little experimenting yesterday. Seems that if I stop, turn off truck then restart immediately the problem persists; engine will not exceed RPM.

However, if I stop, turn ignition off and wait minutes before restarting the truck will run normally for an hour or two before power is lost again. If the issue was a clogged fuel filter I cannot imagine the problem would come and go.

Likewise cannot imagine that bad fuel pump would be interment over the time frame of a year. If the problem was the turbocharger wouldn't there be a lot of smoke?Gray or Blue Smoke from Diesel Exhaust. Newer, low mileage truck owners can skip this paragraph, but many of us like to have a worn out beater truck laying around, or maybe your teenager bought their first car from a not-so-honest guy. Blue usually means one thing: you are burning oil.

Common issues include piston rings, valve seals, PCV valves, injector o-rings, turbo seals or the turbo itself; depending on the vehicle. Besides jumping into an engine rebuild, many owners try to narrow the cause down by starting at the lowest cost and working upwards. Stiction Eliminator is a smart place to start.

It helps remove the built up coked and varnished oil and soot, prevents future coking, helping the rings and seals do their job, which in turn restores compression.

The cleaning of the turbo, camshaft and other internals that oil comes in contact with reduces friction in the engine, helping to lower engine operating temperatures and making the engine run more efficiently and smoother. Stiction Eliminator belongs first on the list due to its money back guarantee and ease of installation. Next, many auto parts stores offer compression test units for rent, and you receive your money back when you return the tool.

PCV valves are usually the next cheapest, these can go bad and suck oil into the intake, depending on the vehicle. Consult your mechanic if unsure on your next step, many manufacturers have an acceptable amount of oil that might be burnt during normal operation as the vehicle ages. White Smoke from Diesel Exhaust. White smoke in diesel engines is usually the last color you want to see, particularly on gas cars. If the smoke is thin, and goes away relatively quickly, than it is merely condensation.

However, thicker, longer lasting smoke is a much larger headache. Your engine is more than likely burning coolant. This can be the result of a blown head gasket, damaged cylinder head, or cracked engine block — none of these are easy on the wallet.

Diesels can also put out white smoke when fuel passes completely through the engine and reaches the exhaust without having been burned. This might be caused from the engine being too cool to burn the fuel, low compression in cylinder sfuel injection timing, defective fuel injector, burnt out glow plugs, clogged air filter or poor quality fuel. Diesel Extreme is the go to solution for this color smoke since it attacks many of these issues.

Diesel Extreme contains powerful detergents and dispersants to removes water, bacteria and break down sludge, completely cleaning your entire fuel system, from the tank to the injectors. Another fix might include adding an automatic pre-heater, or unfortunately the entire replacement of your engine depending on the issue.

Black Smoke from Diesel Exhaust. People throw tuners, modules, or some kind of smoke switch, onto their diesel to make the truck add more fuel than necessary to create black smoke, as well as install larger injectors. A little black smoke is normal on a properly functioning diesel, but keep an eye on the amount of smoke at different RPMs and loads so that you will be able to tell if something is amiss.

Stiction Eliminator is a great place to start when trying to get rid of black smoke. It will make sure the turbo internals, camshaft, and HEUI injectors are cleaned and lubricated.

Stiction Eliminator helps restore compression to ensure that the combustion chamber is in optimum performance. For other situations a dose of Diesel Extreme might be what you need to clean out those injectors coked with burnt fuel and get them firing like new. Replacing your air filter, checking the intake manifold out, or fiddling with your aftermarket tuner might be the answer. Running rich too much fuel is always better than running lean not enough fuel. Search for:.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.

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.

Reading Smoke, What Your Exhaust’s Smoke Means

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.Try it free for 14 days.

duramax smokes when accelerating

View Full Image. Diesel Power Magazine how to. We've Got Answers!

duramax smokes when accelerating

Jason Sands —. White Smoke Part One. I have an '06 Dodge Ram with a 5. Sometimes when it is cold, the truck sputters and blows white smoke, and it takes a few minutes to clear out.

I just had the injectors rebuilt, so I hope that's not the problem. The truck has hp injectors, a 63mm turbo, water-methanol, and a host of other modifications. Any chance you can help with this? White smoke can mean a few different things, but it shouldn't be that hard to narrow down. If it is smoking out the tailpipe, that means that either coolant or a bunch of excess fuel is getting into the combustion chamber, or the engine is low on compression. An easy test to see if the engine has an excess amount of blow-by is to pull the breather cap on the valve cover and check for smoke.

If there's a bunch of white smoke coming out from the valve cover, then you might be a cylinder down. Another possible issue is a worn-out injector, an injector with a cracked tip, or a bad harness or solenoid. If this is the case and too much fuel is being injected, a shop can cap off the feed line to each injector, one at a time, until the culprit cylinder is found.

Even if the injectors are "rebuilt," many companies just put new parts inside of older core injectors, and then send them out without testing them. Finally, check your coolant level, and see if it's dropping. If there's enough coolant loss that the engine is sputtering in the morning, then that means you have a serious problem. While coolant loss into the engine is a common issue on Fords, it's much rarer to find a Chevrolet or Dodge with the same issue. If it is losing coolant, whatever you do, don't just keep adding coolant and driving the truck.

Fuel or oil dilution again, especially on Fords can ruin an engine in a hurry if too much coolant gets into either one of those systems. There are also less likely causes, like a water methanol system that's leaking into the engine, or a bad grid heater, but these few ideas should give you a place to start. How many turbos can you put on a diesel engine?

What's the benefit of having more than one? Are there any drawbacks?

duramax smokes when accelerating

Way back inwe did an article on a drag race semi that had a whopping six turbos on it, but the most we see on a single engine under normal circumstances is four, on sled pulling semis and tractors. The arrangement of these turbochargers is usually two atmospheric turbos feeding an interstage compressor, which then feeds a high-pressure turbo, which then feeds the engine.

So in short, four turbos in three stages.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.

duramax smokes when accelerating

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 color.

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. 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. 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 CO 2 and H 2 O 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.Click here to view this document as a PDF right-click to download. A common issue with the GM 6. Worn and damaged injectors are often the cause however there are other causes and considerations that should be looked at prior to injector replacement.

Remove IGN 1 relay. Remove the glow plug from the suspect cylinder s. Crank the engine and check for fuel spray coming out of the glow plug hole. Caution: Make sure you are not in front of the glow plug hole during this process. Replace any injectors on the cylinders that spray fuel. During this step make sure it was fuel and not coolant that was discharged. Change the engine oil and filter.

Coolant may enter the cylinder from a damaged seal between the fuel injector sleeve and the cylinder head. The injector sleeve is often dislodged during an injector removal.

Crank the engine and check for coolant spray coming out of the glow plug hole. If no coolant is present and the vehicle has a history of low coolant level, check the rest of the cooling system, head gaskets and the EGR cooler for leaks. Perform a glow plug system and intake air heater check even if there is no complaint of a cold start problem. Engine compression.

Dilution of the oil with fuel. Engine coolant temperature sensor. Rail pressure sensor. Proper fuel supply to the high-pressure pump. Contact Old Virginia Rd.

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