Fran3682821 Posted August 19, 2014 Share Posted August 19, 2014 My 2007 Mack Granite with mp7 engine smokes black when under any strain. New air filter and fuel filters. Truck has good power and does not take any oil or antifeze. Another guy in my town has the same truck and his burns way cleaner than mine. Also has Allison 4500 RDS auto trans. Also when I start it up when its cold flakes of soot come out of the exhaust. I had this truck since 2010 it always would smoke some black smoke when under strain but not like now. Seems to be a little harder on fuel now also. Heard allot about EGR valves going bad could this be the cause ? Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/ Share on other sites More sharing options...
NoClueJoe66 Posted August 19, 2014 Share Posted August 19, 2014 I cannot say about the Mp7, but the series 60 Detroit in the truck I drive done the same thing and it was the EGR....maybe someone else can tell you exactly what it is, but my guess is EGR Quote This message was brought to you by Hargraves Potted Meat Product. Chopped full of "Peckers & Lips" since 1933 - John Boy & Billy Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256533 Share on other sites More sharing options...
Popular Post bbigrig Posted August 19, 2014 Popular Post Share Posted August 19, 2014 Fuel or Air issue and yes EGR valve issues will cause a lack of boost and thus black smoke.......Hang on a sec.....An MP7 rolling coal is pretty cool!!!! Too bad that DPF will plug up and its costing you alot in fuel.Remember the days when if your Dog didn't smoke a bit you set it up wrong.......Those were the days.......Excuse me while I slip into daydream mode of Mack's taking off from a light in a small cloud. 4 Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256559 Share on other sites More sharing options...
wheeler73 Posted August 19, 2014 Share Posted August 19, 2014 If it is a 04 emissions MP7 there is no dpf. Egr and boost leaks are very common. Also the turbo can cause this. Check the boost hoses, piping, charge air cooler, and intake manifold. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256642 Share on other sites More sharing options...
Fran3682821 Posted August 20, 2014 Author Share Posted August 20, 2014 I do have a small leaking sound seems like its coming from under the passenger door. I was convinced that its the clamp around the flex pipe, but seems like I can't get rid of the leaking sound. My pickup had the same sound and it was a bolt broken off of the manifold, but the manifold seems fine with no sign of soot leaking out. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256652 Share on other sites More sharing options...
Fran3682821 Posted August 20, 2014 Author Share Posted August 20, 2014 If the egr or anything would there be some soot trails? Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256653 Share on other sites More sharing options...
br549 Posted August 20, 2014 Share Posted August 20, 2014 our 07 mp7 04 emissions had the exhaust gasket blow on it, it had the 1 style gasket that had the thick sealing bead around them, we replaced them with the metal gaskets. you could not hear them like the older macks and didnt show up as bad, we finally sprayed water around exhaust when cold and it showed up Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256658 Share on other sites More sharing options...
Fran3682821 Posted August 20, 2014 Author Share Posted August 20, 2014 What exzactly showed up when spraying cold water around the exhaust. What gave it away that the exhaust had a gasket gone when the water was sprayed on it? Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256673 Share on other sites More sharing options...
bbigrig Posted August 20, 2014 Share Posted August 20, 2014 Black smoke but now power issues.......Usually if you have enough of a boost leak to cause heavy black smoke a lack of power issue comes with it. (Not always)I've seen over fueling injectors with good boost. Whats your boost readings? I've got some other ideas but want to hear some numbers first. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256690 Share on other sites More sharing options...
Fran3682821 Posted August 21, 2014 Author Share Posted August 21, 2014 My boost gauge maxs out at 40 psi and when the rpms are around 15 to 1600 the boost gauge goes up to 37 38 pounds of boost. I hear the turbo well in the exhaust. I put on a new turbo and. actuator 2 years ago because the actuator wasn't working right and Mack recomended to change the complete unit. Since the new turbo lots of boost on the gauge but that's when I started seeing more black smoke too. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-256773 Share on other sites More sharing options...
bbigrig Posted August 28, 2014 Share Posted August 28, 2014 did you replace the turbo and turbo actuator separately or at the same time? The actuator needs to be timed to the turbo with a computer when replaced. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-257657 Share on other sites More sharing options...
Fran3682821 Posted August 31, 2014 Author Share Posted August 31, 2014 Hey just saw your post. When I changed the turbo it came with the new actuator attached with it. My Mack dealer said I would just have to bolt it on. But its been since then that it began pushing out more black smoke. Lately seems like more. But maybe the actuator is out of adjustement. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-257922 Share on other sites More sharing options...
wheeler73 Posted September 1, 2014 Share Posted September 1, 2014 The turbo and actuator are calibrated already unless someone took the actuator off. That could be the issue and it will need to be recalibrated. Also could be a defective turbo or actuator. I have seen that right out of the box. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-258040 Share on other sites More sharing options...
bbigrig Posted September 2, 2014 Share Posted September 2, 2014 I too have seen bad ones from the box. My question was to clarify weather or not you replaced just the actuator, as I have only had to replace the actuator on several occasions. Quote Link to comment https://www.bigmacktrucks.com/topic/36747-mp-7-rolling-coal/#findComment-258236 Share on other sites More sharing options...
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