I need help

[Bigkaner]

Hello everyone, I have a 2015 ram 3500 with 6.7 I installed my mm3 kit about a year ago 5" turbo back exhaust. Out of nowhere 2 days ago left truck idling for about 30 minutes put it in drive and truck starts to run like I'm in lope mode... truck will idle fine around 1200 rpm my rail pressure is normal and boost pressure normal changed fuel and air filters and crankcase filter not sure if it's a injector issue or a transmission problem i also noticed about a week ago I opened my fuel cap and heard a suction sound now I'm at a stand still any help will be appreciated thanks

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[Power247]

Hello everyone, I have a 2015 ram 3500 with 6.7 I installed my mm3 kit about a year ago 5" turbo back exhaust. Out of nowhere 2 days ago left truck idling for about 30 minutes put it in drive and truck starts to run like I'm in lope mode... truck will idle fine around 1200 rpm my rail pressure is normal and boost pressure normal changed fuel and air filters and crankcase filter not sure if it's a injector issue or a transmission problem i also noticed about a week ago I opened my fuel cap and heard a suction sound now I'm at a stand still any help will be appreciated thanks

Welcome to the forum!!

Is the truck throwing a CEL? Even if it's not, us the MM3 to check for trouble codes and report back. Hopefully there is something in there that can help.

Greg
2012 | RAM 2500 | CCSB | Custom tuned by Double R Diesel
2016 | Heartland Pioneer | DS310

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fchavez1989 My 2016 ram 2500 Cummins 12 valve tune has a loud sound sometimes and other times is not as loud this happens after they did the new update

01-02-2020

[watersupply189]

Welcome friend! I agree check the MM3 for any codes. Who tuned your truck?


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

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[Bigkaner]

I got my tuner from DRD and I installed it i checked the mm3 and no codes

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[Bigkaner]

Is it possible it could be something with the COV ?

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[AnOldBiker]

@MrCarver

Have you found out what's causing that sucking sound from the fuel cap opening?

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[Bigkaner]

No I dont know why it was creating a vacuum in the fuel tank that's why I changed the fuel filters

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[Bigkaner]

Do you think it's ok to drive it this way ... this is my work truck and need to drive it everyday

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[DIESELWRKS]

so normal idle rpm its doing a lope but at higher rpm 1200 its fine?

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[Bigkaner]

Yes when I start my truck it will idle rough and the whole truck shakes but once I increase rpm with my cruise control it goes away and idles normal but as soon as I press the brake and put it in drive the truck will surge like it's in lope.

It sounds like I'm missing a cylinder when driving down the road at around 1200 and when I go to increase rpm around 40mph trying to get up to 55 or more the truck feels like it wants to stall out.

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