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Kds 750 smokes badly seems to be to much fuel is this an injector fault ? nev

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My 1992 nissan terrano blows to much black smoke .how to fix this .some say i have unbirt fuel?

if diesel and turbo , check turbo operation of for holes in the intercooler
if turbo or naturally aspirated check/ replace injector tips as black smoke indicators squirting and not atomizing
if petrol check for excessive fuel pressure, faulty injectors , leaking injector seal
regardless of petrol or diesel --black smoke indicates incorrect air / fuel ratio ( too much fuel) so injectors, intercooler, bad turbo or blocked air cleaner are all candidates for the fault

Dec 04, 2016 | Nissan Terrano Cars & Trucks

1 Answer

My BMW 525i pcv tubes was broken replaced all cleaned the icv had a lot of smoke cleared up within a week .seemed to have fixed but now I have small trail of sooty smoke

As a general rule black smoke is soot from excess fuel, white smoke is either steam or a great deal of unburned fuel (mainly diesels) and blue or blue/grey smoke is burning oil.

A trail of sooty smoke would indicate too much fuel is entering the cylinders. Perhaps you have a dribbling injector or a faulty sensor or perhaps your injectors are old and worn with bad spray patterns.

Jun 22, 2016 | BMW Cars & Trucks

2 Answers

What does it mean when gas is coming out of the tail pipe and the car has no power?

Most likely your problem is being caused by a sticky fuel injector. When a fuel injector sticks open it constantly sprays fuel into the combustion chamber even when there is no spark being supplied to that cylinder. Therefor all that fuel gets expelled from the combustion chamber through the exhaust. The white colored smoke is the raw fuel burning in the exhaust pipe. The white smoke may also be caused by a blown head gasket(which can be caused by a stuck injector).

Mar 14, 2016 | Beck Arnley Fuel Pressure Regulator...

1 Answer

Causes for excessive fuel consumption in caterpillar D398 Engine

V12 twin turbo with 2x 6cylinder injector pumps.

Excessive fuel consumption can be ...
fuel leak on to the ground.. Obvious
fuel leak into sump via fuel pump body... Check sump oil
worn piston rings... Grey Smoke
glazed cylinder walls...smoke
burnt valves... Need compressin test
faulty turbo(s)... Sound, check manifold pressures
blocked exhaust line/muffler... Smoke black
faulty thermostat so motor doesn't get up to temperature, what is motor temperature ? ... Smoke black
lack of oil, wrong grade of oil for temperature
scavenge fuel line from injectors blocked or not returning to tank
faulty injector(s) causing poor fuel spray
faulty injector(s) bleeding fuel into cylinders... Smoke black
faulty injector pump balance
faulty injector pump timing
faulty coupling between injector pumps, even can be one 180deg out of timing
bad diesel fuel

Are there mechanical losses in motor load ? Alternator fault ? or gearbox fault prop fault ?

What is the exhaust colour ? Black or grey ?
What are the inlet manifold pressures ?
Using a thermometer ( IR if available ) what are the cylinder head or exhaust manifold temperatures ? This may isolate problem to one or more cylinders.

If you can supply more information I may be able to help track down the problem.


Apr 02, 2015 | Caterpillar D398 marine engine - 1200 rpm

1 Answer

Hi I got a Toyota corolla 160i gle and it was parked very long so wen i started it wen ideling no smoke BT wen hit da fuel it smokes and on take off BT wen driving it does nt smoke

Generally, it may smoke on startup for a few seconds then quit and seem to run fine, then you hit the gas and it smokes again, so Is it white smoke gray smoke or blue smoke? Because IMO it's either a bad head gasket, bad valve guides, rings are going bad ot dumping to much fuel into carb or injectors.

Mar 14, 2015 | Toyota Corolla Cars & Trucks

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F-750 with a cummins lacks power ,changed fuel filter several times

Could be a lot of things. Is it smoking excessively. Could be a clogged air filter. Bad turbo. Intake leak leaking boost pressure. Bad injectors. Failing fuel pump. Does it misfire?

Sep 22, 2014 | Cars & Trucks

2 Answers

We just purchased a 2002 Ford Escort. Tonight, when starting the car, it ran very rough and then died. We started it again and it ran fine after that. It has happened twice and it has only happened when...

Could be a idle air problem. The injector could be leaking when you shut it off ..Try some injector cleaner see if it gets better..The idle air shouldnt run rough just idle real low or sometimes it will get stuck and idle high....Are you losing any antifreeze..If you are the 2.0 SOHC engine bad about leaking antifreeze into the cylinder and makes the engine run rough until it burns it out..See if you can see the smoke coming out when it happens..White smoke indicates antifreeze,,Black smoke indicates fuel..

Sep 04, 2011 | 2002 Ford Escort

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Hi i have mazda 323f 1998 model i have problem with my car its giving black high smoke i changed the heat sensor & air sensor but still same problem. plz plz tell mee the solution plz ...."

Black smoke usually indicates an overly rich air-fuel mixture--unburned fuel is escaping as the black particles in the exhaust.
Overly rich fuel can be caused by many things. The first thing I would do is hook up a diagnostic device (i.e., an OBD-II code reader) and see if your on-board computer is reporting any odd readings. You might have a fault with your O2 sensor (quite common), for example. A stuck thermostat would prevent the engine from ever properly heating up, so if that were the problem, the computer might register abnormally low coolant temperature readings.
Some less likely possibilities might not show up in a code scan. A completely clogged air filter might limit air intake so much that the computer can't properly adjust the air/fuel mixture. A bad catalytic converter (which is no longer taking care of unburned fuel before it exits the tail pipe) might also not trigger a trouble code, depending on what sensors are on that component. Finally, you could have a bad or stuck injector that's simply dumping more fuel than it's supposed to into the intake manifold. (I believe this car has 1 common injector for all cylinders, not individual injectors for each cylinder. I could be wrong.) However, a bad injector would likely give you noticeable performance problems, too. If the car seems to be running well, I would trouble-shoot this possibility last.

May 09, 2011 | Mazda 323 Cars & Trucks

1 Answer

2001 vt 750 shadow blowing white smoke 1 cyl is dead seems like raw fuel out exhaust has spark and new plugs seems like carb is loading up took apart card and diaphram seems in tact float works properly so...

White smoke is usually burning oil.

If you have a dead cylinder, then you may have poked a hole in the piston, allowing the combustion chamber to burn oil.

If your piston is not ruined, then your rings are. If you are "puking" or burning an excessive amount of oil, then your rings are bad, cylinder may need re-honing, or you may need valve guide work. Good luck.


Oct 13, 2010 | 2003 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

Cylinder number one stops firing, and black smoke comes out of the exhaust. I replaced the coil pack and spark plugs. when i unplug battery and reset the faults, it drives fine for a couple days. what...

honestly it sounds like you have a bad computer. there is a constant 12 volts going to each fuel injector and the computer momentarily grounds each fuel injector to activate, the black smoke is from too much gasoline and the missfire is probably from the injector either hanging open or being held open electricaly. next time it starts to missfire on number 1 cylinder try taking a stethiscope or long screw driver and put it on #1 fuel injector with the engine running and see if you hear a clicking sound. If not try unplugging the #1 Fuel injector. this won't fix the missfire but you can see if the black smoke clears up. if the smoke doesn't clear up with the injector unplugged and you are sure its # 1 cylinder thats missing, replace #1 fuel injector.

Jul 10, 2010 | 2002 Jeep Grand Cherokee

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