Vehicle failing to pull, smoking black
I am driving a Isuzu Big Horn 4JG2, 1994 model. When driving on plains (.i.e flat surfaces), the vehicle accelerates up to a maximum of 90Km/hr. However, when driving up steep slopes, the vehicle slows down to around 10 to 20Km/hr. It produces black smoke when driving up steep slopes. My Mechanic has tried replacing the turbo and serviced the injectors, replaced fuel and air filters but there is no improvement. What could be the problem?
Daulos Mauambeta, Malawi
Daulos Mauambeta, Malawi
My car has 215000 miles.
My car has a manual transmission.
Experienced mechanics share their insights in answering this question :
Hello. If the vehicle is struggling when traveling up inclines then it may be possible that there is issue related to the engine, or possibly transmission. Black smoke is produced when the engine is unable to properly burn all of the fuel that is being delivered into the engine. This can be caused by excessive fuel or lack of air. If the you have already serviced the aforementioned components then the next things I would look at are the vehicle’s fuel system. A malfunctioning fuel pump or fuel pressure regulator may be sending excessive fuel to engine, causing your issues. The same can also occur if there is an issue with one or more of the engine’s sensors that causes the computer to deliver excess fuel incorrectly. I would also make sure to use lower gears when driving up any steep hills or through heavy loads, as using higher gears may put an excessive load on the engine, potentially causing your issues. As these sorts of diesel engine issues can sometimes be difficult to diagnose, I would recommend having a professional technician, such as one from YourMechanic, visit your location to diagnose what the cause of your black smoke may be.
How to Identify and Fix Common car Problems ?
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Black smoke means there`s too much fuel or not enough air to make an ideal combustion reaction. If you`re trying to trouble shoot fixing this problem, unfortunately there are lots of things that could be causing it. Having excessive carbon buildup in the wrong places or a faulty turbocharger.
Billowing black smoke is generally a sign that the fuel-air ratio in your engine is too rich. This means that the fuel injectors are either adding too much fuel or that the intake valves aren`t letting enough air in. This could be caused by a leaking fuel injector, a faulty fuel pressure regulator, or a bad air filter.
Smoke often leaves car engines as a result of overheating. This can be caused by faulty wire casings, heated residues on the engine block and overheated liquids including oil, transmission fluid and brake fluid. There may also be a fault in your coolant system, or your engine may not have enough lubricant.
When this happens, this can be the result of many things such as faulty fuel injectors, a failing mass air flow sensor or a faulty fuel pressure regulator allowing too much fuel to be supplied to the combustion chamber to be burnt.
The fix for this is to add a detergent additive to your diesel fuel on a regular basis. A multifunctional treatment like Dee-Zol will clean out the deposits, reduce the amount of fuel burned incompletely burned, and can even extend the life of your DPF (because less soot are being produced at any one time).
Black exhaust smoke
“When your exhaust pipe gives off black smoke, one of the things to get worried about are bad or worn out spark plugs. It means fuel burning in the combustion chamber is not being done 100 percent or burnt fully. It also means that air is not being well mixed with fuel to burn effectively.
Black smoke, also known as `soot` is caused by incomplete, low-temperature combustion. When a diesel engine fails to reach its specified pressure, the temperature will also be correspondingly low.
The carbon chucks could clog your EGR valve, which will result in loss of power, fuel inefficiency and emission of black smoke from your exhaust.
One of the telltale symptoms of a blown head gasket is white smoke from the exhaust. It`s important that the smoke is white because blue or black smoke can indicate a rich running engine or an engine that is burning oil.
The type of fuel and how hot it`s burning. In general, a hotter fire will convert more fuel into elemental carbon, which forms into tiny particles that absorb light and appear in the sky as black smoke. A cooler combustion—or one that doesn`t work as efficiently—yields less-pure forms of carbon.
Incomplete combustion occurs and soot is formed when there is an overabundance of fuel (both diesel fuel and lube oil), insufficient residence time in the combustion zone, and/or non-availability of sufficient oxidants. Over-fueling is the primary cause of black smoke from the exhaust of a heavy duty diesel engine.
Relevant Questions and Answers :
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Vehicle failing to pull, smoking black
ANSWER : Hello. If the vehicle is struggling when traveling up inclines then it may be possible that there is issue related to the engine, or possibly transmission. Black smoke is produced when the engine is unable to properly burn all of the fuel that is being delivered into the engine. This can be caused by excessive fuel or lack of air. If the you have already serviced the aforementioned components then the next things I would look at are the vehicle’s fuel system. A malfunctioning fuel pump or fuel pressure regulator may be sending excessive fuel to engine, causing your issues. The same can also occur if there is an issue with one or more of the engine’s sensors that causes the computer to deliver excess fuel incorrectly. I would also make sure to use lower gears when driving up any steep hills or through heavy loads, as using higher gears may put an excessive load on the engine, potentially causing your issues. As these sorts of diesel engine issues can sometimes be difficult to diagnose, I would recommend having a professional technician, such as one from YourMechanic, visit your location to diagnose what the cause of your black smoke may be.
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black smoke from exhaust only while applying more accelerator especially more than 2000 rpm…no smoke in idle or slight accelation
ANSWER : Hi there. I understand your confusion. It may be advisable, to find another repair facility. The exhaust smoke (black in color) is typically, an indication of too much fuel being delivered to the engine. This may be, the result of a faulty fuel pressure regulator. The dirty air filter, would of been another possibility, had it not been recently checked. I recommend having your vehicle’s black exhaust smoke be diagnosed and repaired by a certified technician, such as one from YourMechanic.
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Blue smoke black smoke white smoke what do they mean
ANSWER : Hello. If there is blueish smoke coming from the exhaust, then that is an indication that the engine is burning oil. This can come from the valve stem seals or from the piston rings. It can also come from the PCV system if it is not working correctly. If the vehicle is a 2015, then you may want to take it to the dealer if it is under warranty. I would also check the oil level is the oil have been changed recently. If the oil is overfilled, then this will occur. If you would rather not go to the dealer, a local expert from YourMechanic can come to your car’s location to diagnose the smoke and advise you on the repair.
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Would mixing a quart of oil with a 15 gallon tank do damage to a I4? I just want it to blow black smoke. Any other ideas? thanks! 1986 VW Golf
ANSWER : Hi there – adding a quart of oil to your fuel tank will effectively do the same thing as putting diesel fuel into your tank. The engine will quickly foul the injectors and plugs, clog the catalytic converter, and stop running altogether. Yes, it will create blue smoke out of the exhaust, but not for long. Then you will have to drain and flush the fuel system, re-fill and prime with straight gasoline, replace the clogged catalytic converter, and….. Not a good idea!
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Black smoke from engine
ANSWER : It is possible that your valve cover gasket is leaking. If the valve cover gasket is leaking, this can cause oil to leak on to the exhaust. This will cause the leaked oil to burn off on the exhaust and produce smoke. I would recommend having your vehicle checked out with an oil/fluid leak inspection to determine if this is the case. Consider YourMechanic as this service can be completed at your home or office.
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Emitting smoke out tailpipe after spark plug and valve cover replacement, no overheating, after a week spark have black oil deposi
ANSWER : It’s pretty common for the spark plug tube seals to fail, allowing the tubes to fill with oil. It could be that when you performed the repair, the seals didn’t get installed properly. Other potential causes for your oil-soaked plugs include worn valve guides, worn rings or a faulty positive crankcase ventilation (PCV) system. Any of these issues can result in blue-gray or gray-white smoke being emitted from the tailpipe. I recommend having a professional diagnose and repair your concern. YourMechanic is an excellent option because we come to your home or office.
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Our 1995 Isuzu Rodeo has black smoke from the tail pipe and it is chugging and we think it is the oxygen sensors. Could it be something else?
ANSWER : Hi there. There could be an issue with the fuel injectors, fuel pressure regulator, or the spark plugs. Check the spark plugs and see if they are wet with fuel. Black smoke is a sign of excessive burning fuel. Check the fuel injectors for any of the leaking or the fuel pressure regulator for the pressure on the fuel rail. The pressure on the fuel rail would need to be no more than 65 psi. If the pressure is more, then the fuel pressure regulator may be malfunctioning. If the spark plugs are wet with fuel, then either the plug is fouled out, the ignition coil is not working, or the fuel injector is leaking. If you need further assistance with excessive black smoke, then seek out a professional, such as one from Your Mechanic, to help you.
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My MAP sensor failed I replaced it then it failed again in one day
ANSWER : Hi and thanks for contacting YourMechanic. This issue is not the MAP sensor, but rather the mass air flow (MAF) sensor. This sensor is usually missed unless the computer sees it malfunctioning. Most of the time the MAF will get dirty and become ineffective and not work properly, but be within the parameters of the computer system. Check the MAF sensor and clean it out with dry air. Then put it on and disconnect the battery for 12 minutes and hook it up. This will clear the computer to want to relearn itself. Then drive the vehicle and see what happens. If the light comes back on, and the power is dropped again, disconnect the MAF and see if the engine continues to act the same. If the engine does not change then the MAF is not working and needs to be replaced. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, that can assist you with the engine chugging issue.
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