Why is my Duramax blowing black smoke?
Black smoke means it is injecting fuel that it can’t burn. This could be timing, excess fuel flow or insufficient air flow. Since the smoke goes away when you let off that’s a good sign. It means the problem isn’t likely to be a compression issue or leaky injector.
What causes a Duramax to smoke at idle?
A common issue with the GM 6.6L LB7 Duramax engine is white smoke at idle. Worn and damaged injectors are often the cause however there are other causes and considerations that should be looked at prior to injector replacement.
Why is my LLY Duramax blowing white smoke?
White smoke from an LB7 Duramax engine often indicates faulty injectors. In many cases, white smoke emanating from the tailpipe (often at idle once the engine reached operating temperature) typically means a worn out injector.
Is seafoam bad for Duramax?
Do NOT inject Seafoam, or anything else in the intake of any diesel. The diesel engine has no throttle, so the engine will “Run Away”, and will continue to increase engine speed until the engine blows, or it runs out of the product you have put in the intake.
What causes black smoke from the exhaust pipe?
One possible reason behind black smoke from exhaust pipe is damaged piston rings. Piston Rings are designed to prevent the infiltration of engine oil inside the combustion chamber.
Why is my LMM engine blowing black smoke?
Any injectors that are more than +/- 6 are a possible cause for rough run. .Miss, smoke or rough run usually indicate that the injectors are the cause. LMM engines with a DPF may not show any smoke, but frequent DPF regen events would suggest poor combustion.
How can I get black smoke out of my exhaust?
Luckily, you can mix the diesel fuel with a detergent additive to get rid of these harmful deposits. The black smoke will disappear after a few days after you do that. 4. Get The Engine Rings Checked And Replaced If Damaged
When do you get black smoke in your car?
During the 2–3 hard accelerations after normal light load driving there may be some black smoke momentarily but should not last for more than 5 seconds. During hard acceleration there may always be a very faint puff of black smoke. Compare the scan tool data at idle with the scan tool data list. Refer to Scan Tool Data List.