teslacoil
Junior Member
Hi,
I have a 2006 Ram 5.7 with over 200K on the odometer. When MDS engages, I feel a slight power loss and hear more lifter noise than when MDS is not engaged. It's most apparent if I have the driver's window rolled down and am passing an island adjacent to the leftmost lane. I have looked into this issue and read other people describing it as sounding like a spoke card. From what I read, one of the theories was that when the MDS engages on a high mileage 5.7, it puts more stress on the 4 lifters that are still active and that's what causes the noise. Whether this is true or not, I don't know, but it sounded the most plausible.
I wanted to see if this type of lifter noise is considered normal operation with these engines as they age. At this point, I would like to disable MDS. My next question, is, what software and/or scan tool would a private shop need to have in order to disable MDS or flash the PCM if I didn't want to have the dealer do it? I called one shop in my area and they didn't even know what MDS was. Another shop told me they weren't able to do it.
I also have been getting a P1521 code: Incorrect engine oil viscosity. However, 5W-20 is the only oil that's ever been added to the crankcase. The oil pressure sending unit has already been replaced twice in the past. One of the remedies for this issue is a TSB which recommends reflashing the PCM. So, I am hoping to have the PCM reflashed with the latest update and turn MDS off. I have access to a Diablosport Predator 2. All I would use it for would be to disable MDS, and not to upload a tune. If I were to disable MDS using that, would the dealer or a shop be able to write over that tune with a factory tune to address the P1521 issue, if the PCM is the culprit? Any advice would be appreciated.
I have a 2006 Ram 5.7 with over 200K on the odometer. When MDS engages, I feel a slight power loss and hear more lifter noise than when MDS is not engaged. It's most apparent if I have the driver's window rolled down and am passing an island adjacent to the leftmost lane. I have looked into this issue and read other people describing it as sounding like a spoke card. From what I read, one of the theories was that when the MDS engages on a high mileage 5.7, it puts more stress on the 4 lifters that are still active and that's what causes the noise. Whether this is true or not, I don't know, but it sounded the most plausible.
I wanted to see if this type of lifter noise is considered normal operation with these engines as they age. At this point, I would like to disable MDS. My next question, is, what software and/or scan tool would a private shop need to have in order to disable MDS or flash the PCM if I didn't want to have the dealer do it? I called one shop in my area and they didn't even know what MDS was. Another shop told me they weren't able to do it.
I also have been getting a P1521 code: Incorrect engine oil viscosity. However, 5W-20 is the only oil that's ever been added to the crankcase. The oil pressure sending unit has already been replaced twice in the past. One of the remedies for this issue is a TSB which recommends reflashing the PCM. So, I am hoping to have the PCM reflashed with the latest update and turn MDS off. I have access to a Diablosport Predator 2. All I would use it for would be to disable MDS, and not to upload a tune. If I were to disable MDS using that, would the dealer or a shop be able to write over that tune with a factory tune to address the P1521 issue, if the PCM is the culprit? Any advice would be appreciated.
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