Duramax White Smoke At Idle

I also have an 06 Duramax truck that started smoking after about 1500 miles with white smoke at idle and thick black clouds on heavy acceleration. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time. The truck runs amazing and havnt had any problems aside from the prevalent hard 6-5 shift. We offer a plethora of Mazda 6 2010 for your vehicle needs. 6L Engine Smoke Posted to GM Driveability on 10/24/2011 7 Replies I've got a customer that has a 03 chev. Page 3- T1N Fuel Injectors Information T1N Database. smoke usually gone after about one minute. Generally carbon being burnt will give you gray smoke, but not always. If the black smoke is also coinciding with poor engine performance and/or rough idle, you probably have one or more fuel injectors that are leaking. A lower temperature requires longer heating times. It only puffed some white smoke at idle and then cleared right up after I gave it a little rev. 6 duramax has 10,200miles on it and 600hr on the engine I guess the best way to. Are they all negative, or did you just list them with a dash (indicating they are all positive)?. 5L Gasoline Turbocharged Direct Injection (GTDI) engine may exhibit blue or white smoke from the exhaust while driving after extended idle. 01-04 LB7 greyish/white smoke at idle, take off and blue smoke. Original injectors were changed about 70K under the special policy because of fuel in the oil. 3 and still hasnt skipped a beat. Revitol Hair Removal Cream Duramax white smoke on acceleration - Revitol Hair Removal Cream Natural Revitol Hair Removal Cream Duramax white smoke on acceleration. If I actually had a blown head gasket, would it not lose pressure? Possibly something more serious like cracked head?. 2 of those weeks the truck was tuned and DPF deleted. com FREE DELIVERY possible on eligible purchases. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time. A common issue with the GM 6. For reference, terminal position C1-70 should have a BROWN wire in place. I can only notice it when its in gear and i am at a stop. No white smoke or black smoke, and clears up just off idle. 6L LB7 Duramax engine. Diesel Smoke tells YOU a Story. The white smoke is the result of normal condensation which builds up inside the exhaust system. A Buying Guide for Duramax Fuel Injectors for Trucks. C1-71 is the position to add the terminal for the high idle for the Duramax diesel. injectors were replaced 50k ago oil level and coolant level is good i think it might be bad injectors. If allowed to idle after a cold start, a very slight amount of white smoke can be detected for several minutes. When injectors are the root cause of this issue, they are allowing too much fuel to enter the cylinder over too long a period of time. Fat burning LIPO-6. Also it would overheat a bit when pulling our trailer on a hard long climb. Air in fuel. My 91 Silverado has all the symptoms of a blown head gasket (white smoke exhaust, bubbles in reservoir, water in oil, overheating) but overnight my coolant system is maintaining pressure. 2012 duramax white smoke under acceleration GL 320 CDI smoke - MBWorld. All injectors just tested. 6 Duramax Engine 4th May 2015 If you have a 2001-2004 Duramax 6. I have begun to see white smoke from the exhaust at idle when sitting at a stop sign or so on. my 2003 chevy duramax is smoking at idle (light grey, with a smell of unburnt desiel). Sounds like my car when the waterpump went bad. The Duramax V8 engine is a General Motors Diesel V8 engine family for trucks. Black smoke being produced from the exhaust system of is a sign of too much fuel being processed by the engine. Specific causes are usually found in a vehicle's fuel system. dont worry theyll figure out how to bypass that crap in no time and then you can let the smoke roll. Remove the engine appearance cover, if equipped. Revitol provides discount natural health and beauty products manufacturer direct to our customers. Fat burning LIPO-6. White Smoke Indicates a Faulty Fuel System: Time for a Fuel Injector Service. I have a 03 Duramax 4x4 and blue smoke comes out of the tailpipe at idle or low speed. I've read a little online about people referring to a 'lopey' or oscillating idle. It goes away immediatly when start driving as before I had to drive for awhile before it cleared up. I have an 02 GMC Duramax, it has started smoking a idle. Nothing in oil. I feel it is a normal thing. It was exposed to temps below 20 degrees on vacation and never behaved this way. 00!super Bright Led Reverse Bulb! 96-01 Audi A4 96-01 S4 Smoke Tail Light Assembly. Blow-by is a condition where diesel fuel, air and vapor are pushed past the rings into the crankcase of the engine. Testing a set of customers LB7 with a complaint of white smoke. Chevrolet pickup drivers appreciate the diesel engine created by GM. A few miles with the TT hooked on took care of the smoke problem. You should be getting your truck up to operating temps when you drive. Diesel Smoke tells YOU a Story. Chevy replaced the injectors about 40k ago and then it was just a cloud of grey smoke. Its pretty heavy at times. dont worry theyll figure out how to bypass that crap in no time and then you can let the smoke roll. 6 duramax has 10,200miles on it and 600hr on the engine I guess the best way to. 6 duramax that smokes bad at idle in drive and smoke goes away around 1800 rpm. STARTED SMOKING WHITE. I HAD 03 ALSO. Testing a set of customers LB7 with a complaint of white smoke. If your Duramax emits excessive white smoke while idling it most likely needs new injectors. Exhaust has blue smoke at idle regardless of temps. White smoke occurs in a diesel engine when the diesel fuel goes through the engine and reaches the exhaust without having been burned. What models will a DuraMax engine for sale and components fit? DuraMax engines and engine components are made for quite a few major vehicle manufacturers. Parked my 2005 Sunfire last night and everything was fine. On my way to work this morning and I had to stop, when I went to accelerate I had no power and started blowing a lot of white smoke. Diesel Smoke tells YOU a Story Basically, smoke from a diesel engine indicates that something is not right. In many cases, white smoke emanating from the tailpipe (often at idle once the engine reached operating temperature) typically means a worn out injector. The coolant level should be going down if it is the head gasket. White - Blue smoke at idle when cold If the smoke clears in less than 1 minute, this would be normal depending on temperature and altitude. " McDonald explains that one symptom of a cracked injector is excessive white smoke coming from the tailpipe, generally most noticeable at idle, especially while sitting in traffic. It's not burning oil, but does seem to be loosing coolant? It runs good other than the blue smoke. I know chevy had a problem with valve guides in the older 350s, and 305s, but come on, I have 69000 miles on it and the guides are shot already???. White smoke can be a big problem or not, depending on the thickness. "Bad" fuel injector and excess fuel causes black smoke, gray blue smoke on acceleration or after prolonged idle is oil related ( engine mechanical issues). 1999 - 2003 7. And definitely no shaking. It fades after a block or so. Very hard to start, like air in fuel system. STARTED SMOKING WHITE. Once running at idle at 1025 rpms, smokes white/grayish/blue, but high idle is ok, as i bring it back to idle, slowly but surely it will smoke and run rough again. Car has rough idle, big loss of power, black smoke from exhaust, smokey smell of flooding 9 Answers. Duramax white smoke during acceleration Chevy Diesel Diagnostic information for 6. Other intake components may also cause fuel to feed too quickly into the engine. Water does not make smoke, it makes steam. If your Duramax emits excessive white smoke while idling it most likely needs new injectors. White smoke is common on most of today's automobiles, especially when the engine is cold - when you have just started it - and when it is cool or cold outside. Testing a set of customers LB7 with a complaint of white smoke. 3 and still hasnt skipped a beat. See Diesel Fuel Requirements and Fuel System on page 5-2for information on what fuel to use in cold weather. Dealer says fuel return rate is ok. Parked my 2005 Sunfire last night and everything was fine. 2007 International DT466E no codes. The truck smokes blue smoke at idle and it smells like unburnt fuel. Whatever I use I want it to be available locally so I can get it when I need it. Injectors were changed at 40,000 and 90,000 and it has 126,000 now. White smoke generally indicates intake heater or glow plug concerns. Any help will be much appreciated. The 2006 Duramax, identified as either RPO code LLY (early '06 models) or LBZ (late '06 models), saw another glow system upgrade. I always get white/blue smoke on cold starts even in 40/50 degree days. My Sprinter has really been pretty reliable (Knock/touch wood) so there's been little need to use the DAD other than out of general interest. Recently in the Heavy Duty/Fleet forum there has been discussion about white exhaust smoke on these engines at idle. Black smoke is fuel, blue smoke is oil, and white smoke is water. Had around 150,000 when I bought it. But my experience has been pilot tuning is the key. If the smoke clears in less than 1 minute, this would be normal depending on temperature and altitude. There may be several reasons for a car smoking white smoke from the exhaust. At idle, there's none, right when you hit the gas, there's a ton. The idle is smooth and there seems to be no loss of power or mpg and performs well as always. This test uses the Balanced Rate and Cylinder Power Balance test to identify cylinders that are not producing the designed power output. Theres only 65k on my truck. As for now I think you should just live with it. Hot Shot’s Secret created our diesel diagnostic tool to help you identify common symptoms your engine may be experiencing and learn what you can do about them. Diesels tend to be a bit smoky. Diesel Bombers - Diesel Forum - Dodge Cummins, Chevy GMC Duramax, Ford Powerstroke, And All Diesel Enthusiast Community. If I shift into neutral the smoke goes away, along with the rough idle. What Goes Wrong? A correct fuel and air ratio must be maintained for optimum performance, economy and emission requirements. Duramax white smoke during acceleration Chevy Diesel Diagnostic information for 6. Too much gas will cause black smoke and soot inside the end of the tail pipe. White smoke is common on most of today's automobiles, especially when the engine is cold - when you have just started it - and when it is cool or cold outside. White smoke is usually excess fuel or incomplete firing on that cylinder. I drained the coolant, filled with water and added Steel Seal. Specific causes are usually found in a vehicle's fuel system. Is white smoke at idle always injectors, or can their be other causes. We pulled a 10,000 lb trailer for 6 hours and it pulled like a dream. 6 duramax that smokes bad at idle in drive and smoke goes away around 1800 rpm. Any help will be much appreciated. A lower temperature requires longer heating times. DuraMax manufactures engines for a large number of cars and trucks. No loss of power or heavy oil consumption. 3 white smoke on cold startup But it puffed white smoke for a bit as it warmed up. Blow-by is a condition where diesel fuel, air and vapor are pushed past the rings into the crankcase of the engine. I didn't see the smoke right away as I was driving through some heavy wind and sand, I was assuming it was that. Fellas, I just purchased a 2012 duramax and made my first pull with TT. smoke usually gone after about one minute. I still have the cat. this is on a built motor and just recently got tuned. Smoke from your exhaust explained One day your car might let out a puff of smoke which is particularly large or of an unusual colour. Air shows starts when I get on the gas after idling. The ECM is constantly trimming and adding fuel at idle to stabilze the idle. All so when my truck cut out it was not nearly as dramatic as that, no smoke, no noise, just lost power untill it hit idle then it was fine again:confused:. 2011-2016 GM 6. I sadly sold a Cummings 5. After driving for a short while (3 min or so) it clears right up and doesn't do it again until long idle. For Volkswagen Beetle 06-07 Bulb Super Bright Led Conversion Kit H11, White $185. At an idle (and worse in gear) these early Duramaxes will haze smoke at idle. I HAD 03 ALSO. When injectors are the root cause of this issue, they are allowing too much fuel to enter the cylinder over too long a period of time. Does your Duramax have a rough idle?-At operating temperature the FPR (Fuel Pressure Regulator) can cause a slight lope at idle if it is going bad. In this guide we explain the different kinds of smoke a car could emit and what they could mean. my 2003 chevy duramax is smoking at idle (light grey, with a smell of unburnt desiel). Have a 2014 lml that white smoke on start up and after warmed up when give a little throttle. Now this isn’t always the case, but after some trouble shooting we’re usually the go-to shop when diesel drivers need refurbished, rebuilt, or new injectors. But it's like a cloud of white smoke. Fluid_Ounces: Diesel Additives - Amazon. For reference, terminal position C1-70 should have a BROWN wire in place. Car has rough idle, big loss of power, black smoke from exhaust, smokey smell of flooding 9 Answers. 6L LB7 Duramax engine. A fuel line leaking air will cause white smoke. 6 duramax diesel is blowing smoke and has loss of power. I’m new to the diesel truck world. " Ended up going to the Anthony Lakes area and was up pretty high, even poking around in 1st gear for 45 minutes & barely touching the throttle didn't produce any smoke or haze at all (this was at 6600-6900 feet). If the smoke clears in less than 1 minute, this would be normal depending on temperature and altitude. I havent noticed any power difference or mileage. Duramax white smoke during acceleration Chevy Diesel Diagnostic information for 6. Also, heavy ammonia/urea smell from exhaust and heavy soot in tailpipe. On either of my current diesels ('04 6. Too much gas will cause black smoke and soot inside the end of the tail pipe. 2012 duramax white smoke - Thyroid Health Supplement by Thyromine Natural Thyroid Health Supplement by Thyromine 2012 duramax white smoke. Have you checked your tank and fuel lines for contamination or blockages. Buy Hot Shot's Secret P040432Z Diesel Extreme, 1 QT, 32. Since then, I've had zero issues. Another change is reduced engine-idle speed. Smoke only increases as the engine get hotter. Wartrol Homeopathic Genital Wart Relief is a reliable way to solve your problem. LBZ 06-07 Duramax Cold Air Intakes Engine Parts Fuel Systems Gauges Programmers/Modules LMM 07. Testing a set of customers LB7 with a complaint of white smoke. Diesel Smoke tells YOU a Story Basically, smoke from a diesel engine indicates that something is not right. It has 165,000 miles on the clock, and I have owned is for nearly eight years. It only puffed some white smoke at idle and then cleared right up after I gave it a little rev. when acceleration pedal is off it start jerking a while, then it fine again. The most effective life to do is to consider the timer on the web traffic signal and also transform off your auto correctly or keeping the auto in neutral as well as offering some added Revoltions Per. If Bosch is so great, why are mine and everyone else's failing with low miles ? I'm nervous of Bosch for replacement. I picked up the nasty ass GM injector cleaner today as well as the 6'-8' 3/8 and 1/2" fuel lines to perform this. A fuel line leaking air will cause white smoke. Duramax LB7 injectors are also known to develop external leaks. In my experience, white smoke on hard acceleration can be either carbon build up due that is due to not getting the truck to operating temps, or coolant getting into the cylinder. 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. Jeep was overheating, I had a cylinder 5 misfire, and white smoke in the exhaust. I drained the coolant, filled with water and added Steel Seal. Everything was fine until this past week I started noticing pretty noticeable white smoke coming from exhaust at idle and under acceleration. I just saw your website and I really hope you can help. " McDonald explains that one symptom of a cracked injector is excessive white smoke coming from the tailpipe, generally most noticeable at idle, especially while sitting in traffic. This case study used an aftermarket scan tool example, it shows the air leak PID, which is a built-in leak indicator. I feel it is a normal thing. It is deleted with 116k miles. [Archive] - SnoWest. At idle, there's none, right when you hit the gas, there's a ton. If I actually had a blown head gasket, would it not lose pressure? Possibly something more serious like cracked head?. 00!super Bright Led Reverse Bulb! 96-01 Audi A4 96-01 S4 Smoke Tail Light Assembly. Blowing White smoke at idle I just wrapped up a 3000 mile road trip pulling a 30' enclosed trailer filling up with fuel from dozens of locations along the way. 3 and its blowing blue smoke at start up. The next day, my truck started up with zero white smoke, and only a small puff of black smoke upon starting. talk about a ton of white smoke. 2l Engine Motor Fits Acura Tl 04 05 06 Vin 6 6th Digit Cylinder Head Oil Pan For Sale Online. Too much gas will cause black smoke and soot inside the end of the tail pipe. Richie's Truck and Auto 46,368 views. Hunting idle concerns may indicate fuel pressure control problems. We pulled a 10,000 lb trailer for 6 hours and it pulled like a dream. Other intake components may also cause fuel to feed too quickly into the engine. The thyroid gland produces an important hormone to regulate the needs of the body. Introduced in January of 2004, the RPO code LLY Duramax 6600 incorporates a number of significant technology changes. Signs of failing glow plugs are hard start up, rough idle, hesitation and white smoke on start up tell warm. Even in my owners manual they say white smoke is normal on cold starts. The fuel injector balance test is performed when a misfire, knock,excessive smoke, or rough idle condition exists. 2012 duramax white smoke under acceleration GL 320 CDI smoke - MBWorld. I HAD 03 ALSO. White smoke at idle Duramax 6600. Lots Of White Smoke Out of Exhaust Pipe. Listen to your liver and don't ignore the warning signs. Shop EFILive Custom Tuning for the GM 6. On either of my current diesels ('04 6. I picked up the nasty ass GM injector cleaner today as well as the 6'-8' 3/8 and 1/2" fuel lines to perform this. I can only notice it when its in gear and i am at a stop. The ECM provides glow plug operation after starting a cold engine, which helps reduce white exhaust smoke and improves idle quality after. Roadkill Customs has evolved from local hot rod shop to online how-to magazine for budget-minded do-it-yourself hot rod builders and enthusiasts. I'm only running 45 overs in my Duramax, but it hazed something awful, I cleared most of it up by getting the pulse tables so the idle fuel amount was close to stock, and fine tuning pilot amount and timing. When the temps are low the intake heater grid kicks on and as a result the lights dim and the idle dips quickly and a puff of white smoke comes out the exhaust. It's hard to tell with just the balance rate numbers. If you drive more on the highway, idling never occurs, however in traffic, you often idle a whole lot, which puts immense warmth on the engine. It is like the car is flooding o. Or in other wordsget a REAL diesel!! have 350k on my 97 7. In this oneHOWTO article, we are going to talk about how to stop white smoke from the exhaust, no matter what the underlying reason is. We pulled a 10,000 lb trailer for 6 hours and it pulled like a dream. Rough Idle When Starting Cold, Then Goes Away When Engine Is At Operating Temperature More Details Below I have an older, low mileage vehicle with a V8 engine. Testing a set of customers LB7 with a complaint of white smoke. White smoke and misfiring at idle Duramax 6600. All so when my truck cut out it was not nearly as dramatic as that, no smoke, no noise, just lost power untill it hit idle then it was fine again:confused:. Be like this guy! Get the issue fixed before a bigger one arises. Its pretty heavy at times. Pulled over, boiling over, sprayed coolant out. A Buying Guide for Duramax Fuel Injectors for Trucks. I feel it is a normal thing. It only puffed some white smoke at idle and then cleared right up after I gave it a little rev. Duramax white smoke during acceleration Chevy Diesel Diagnostic information for 6. This test uses the Balanced Rate and Cylinder Power Balance test to identify cylinders that are not producing the designed power output. 6 duramax white smoke at ideal? Answer. All so when my truck cut out it was not nearly as dramatic as that, no smoke, no noise, just lost power untill it hit idle then it was fine again:confused:. Blue white smoke that burns your eyes, is un-burnt fuel, cold temperatures, high altitude and excessive idle time all mean cold. No white smoke at startup or while driving. Being that you have the lb7, get fixed as soon as possible. We pulled a 10,000 lb trailer for 6 hours and it pulled like a dream. I've found in my years of owning light duty diesels white smoke is usually caused by under fueling or bad timing. 6L I4 MPI DOHC CVVT 16V **CLEAN CARFAX**, **LOCAL TRADE**, 60/40… Clean CARFAX. Black smoke being produced from the exhaust system of is a sign of too much fuel being processed by the engine. Hot Shot's Secret created our diesel diagnostic tool to help you identify common symptoms your engine may be experiencing and learn what you can do about them. 2 of those weeks the truck was tuned and DPF deleted. 2012 duramax white smoke under acceleration GL 320 CDI smoke - MBWorld. Dealer says fuel return rate is ok. I had combustion gasses getting into the coolant in my 05 Jeep Grand Cherokee 5. when acceleration pedal is off it start jerking a while, then it fine again. No loss of power or heavy oil consumption. It is like the car is flooding o. I have done the searches for white smoke and the like, and yes i read for hours. Does a 2007 Duramax LB7 have an EGR valve? Can a problem with the EGR valve cause a grey white smoke that smells like unburnt diesel? Injector balance rates are all within +/- 4 Smokes bad at idle and minimal smoke at road speed. talk about a ton of white smoke. However, their theory is that white smoke (which, on a diesel, white smoke usually mean sunburnt fuel is getting past things, thus why you have white smoke) is coming from the 9th injector on their trucks (as they have a V8, they have a 9th injector, whereas we have an I4 so we have a 5th injector inline on the exhaust) when it goes to add fuel. It doesnt do it everytime, but here and there it does. Operating engine at greater than a 15 degree angle. Simple things to check and sure alot cheaper than injectors. White smoke at idle Duramax 6600. Terminal position C1-72 is empty (at least on 2001 models), and C1-73 should have a BROWN/WHITE wire in that position. 2011-2016 GM 6. Testing a set of customers LB7 with a complaint of white smoke. DuraMax manufactures engines for a large number of cars and trucks. I will post a video of the before and after video. Based on the currently firing cylinder (crank and cam position sensors) the ECM looks at engine speed to determine if it's speeding up or slowing down at that instant, or immediately afterTHUS can determine if and injector is flowing too little or too much. Is white smoke always injectors? Any and all comments welcome. Water pump was changed with injectors at 90,000. I have a 03 Duramax 4x4 and blue smoke comes out of the tailpipe at idle or low speed. Worn and damaged injectors are often the cause however there are other causes and considerations that should be looked at prior to injector replacement. Blue white smoke that burns your eyes is un-burned fuel; cold temperatures, high altitude and excessive idle time all mean cold combustion and white smoke. 0L PSD 50k mi and '01 Cummins 185kmi) there is nothing visual coming from the exhaust. Be like this guy! Get the issue fixed before a bigger one arises. " Ended up going to the Anthony Lakes area and was up pretty high, even poking around in 1st gear for 45 minutes & barely touching the throttle didn't produce any smoke or haze at all (this was at 6600-6900 feet). 6L Duramax LML Glow Plugs, set of 8 Replace your old failing or dead glow plugs with a complete new set of DieselRX glow plugs. did not notice any smoke during. Don't Break the Bank: Affordable Duramax Fueling Upgrades Justin Fivella 2016-02-04 Diesel Tech / How-To GM Matt Kutchera's LLY-equipped 2005 Silverado 2500 LTZ is fully loaded, has ridiculously low mileage and is as clean as they come. My limited knowledge tells me white smoke = water, although someone. It's important to get your vehicle checked out and have it fixed as soon as possible. If it isn't injector could be fuel pressure regulator, and or head gaskets. Duramax LB7 injectors are also known to develop external leaks. It's not burning oil, but does seem to be loosing coolant? It runs good other than the blue smoke. My 05 LLY has just recently started blowing white smoke at cold start and idle. I did have some older non-common rail trucks that would start to smoke slightly at idle. Based on the currently firing cylinder (crank and cam position sensors) the ECM looks at engine speed to determine if it's speeding up or slowing down at that instant, or immediately afterTHUS can determine if and injector is flowing too little or too much. from low idle pressures all the way up to full load pressures (as much as 29,000 psi). 6L LB7 Duramax engine. Water does not make smoke, it makes steam. Took the ride back home for about 8 miles at 35mph. Featuring a large digital numerical display, you can clearly see what tune you are in, even at a quick glance. This digital DSP5 switch allows you to easily change your EFILive DSP-5 tune at the push of a button. To the point of rocking the truck a little. Truck has 140K. 2003 Chevrolet Silverado 2500 HD 6. No loss of power or heavy oil consumption. No loss in milage or power, headgasket? Any help is greatly appriecated. If your Duramax emits excessive white smoke while idling it most likely needs new injectors. Ideal for treating acne spots directly. 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. Have a 2014 lml that white smoke on start up and after warmed up when give a little throttle. BMW > 2008 > 335I > 3. -The FPR’s job is to make sure the right PSI of fuel gets delivered to the fuel rail and ultimately the injectors. Lots Of White Smoke Out of Exhaust Pipe. Don't Break the Bank: Affordable Duramax Fueling Upgrades Justin Fivella 2016-02-04 Diesel Tech / How-To GM Matt Kutchera's LLY-equipped 2005 Silverado 2500 LTZ is fully loaded, has ridiculously low mileage and is as clean as they come. On my way to work this morning and I had to stop, when I went to accelerate I had no power and started blowing a lot of white smoke. 6L LB7 Duramax engine. I always thought this was engine warm up making steam from the condensation burning off in the exhaust piping. In fact on 20 degree mornings it would start right up, no smoke at all --- none. The key of longevity for any engine is regular maintenance. 5L Diesel shooting out black smoke C/K Car Forums. One symptom of a cracked injector is excessive white smoke coming from the tailpipe, which is generally most noticeable at idle, especially while sitting in traffic. Diesel Smoke tells YOU a Story. Duramax white smoke during acceleration Chevy Diesel Diagnostic information for 6. Hi Any ideas what this may be only when the car is at full operating temperature from standstill when I take off or at idle there is a puff of white smoke.