new user with problem

erics · Nov 27, 2016

Hello, I've got a 07 Ram Big Horn 5.7 and it's running like a ****. At ALL SPEEDS but especially noticeable at highway speeds with the cruise on. It's acting as if it has a bad miss off and on constantly. The power seems to decrease with a slight increase in rpm's and the sound is awful. I have NO CODES or at least not yet and my CEL is not on. In fact it acts just like my old Ford did when it had a bad coil on plug. It's been running this way for at least two months. Any help would be much appreciated.

MarkV · Nov 28, 2016

Can you explain the problem in more detail. How often does this happen and for how long? What kinda noise?

Sent from my SM-G900F/T/I/M/P/W8 using Tapatalk

erics · Nov 28, 2016

MarkV said:
Can you explain the problem in more detail. How often does this happen and for how long? What kinda noise?

Sent from my SM-G900F/T/I/M/P/W8 using Tapatalk

okay I first noticed there was a problem after start/warmup when I could feel it stumble and the rpms would flutter. But the sound is as if you would block off the exhaust completely on and off nearly every second.

RonJon '06 · Nov 29, 2016

1500? Kinda sounds like the MDS is going in and out.

erics · Dec 4, 2016

ok while driving and having the engine issue described above I pushed the button on the shift selector and the issue stopped. So what does it mean when I have the problem and switch to tow/haul or od off to make it run correctly. has anyone else replaced that MDS module?

RonJon '06 · Dec 4, 2016

The only way to disable the MDS is to buy a tuner and shut it off. Either that or leave it in tow/haul mode all the time.

new user with problem

erics

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erics

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