Bought a Mack Truck. When it decides to regen while going down the road it starts puffing out smoke when I’m accelerating (getting up to speed and keeping speed) it goes away when I let Off the throttle. Smoke comes from passenger side where the filter is. This seem like the doc is done for or an injector ?
2008 Mack CXU613 Smoke while Regen . Injector or Doc?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Brandon0928, Aug 18, 2022.
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Sounds like a cracked or leaking exhaust or bellows pipe.
Brandon0928 Thanks this. -
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Those '08-10 Macks smoke like crazy while doing a regen. No DEF so it just dumps fuel into the exhaust and burns everything out leaving white smoke behind
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DEF doesn't do anything for regen.
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Dave1837 Thanks this.
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Is it coming from under cab or out of exhaust outlet?
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