#7 Injector not pulsing and OBD II codes - Hemi Truck Club
 
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Old 11-28-2018, 11:32 AM   #1
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#7 Injector not pulsing and OBD II codes

Hello all,

Brand new member here and I have a question that hopefully you will be able to help me answer. I have a 2006 Dodge Ram 1500 4X4 with the VIN 2 MDS engine.

About a month ago it threw OBD II code p0307 and began back firing and mis firing. After taking it to a dealership and being quoted a ridiculous amount of money for the repair I politely declined and continued to drive the truck onle when necessary. In the mean time the truck also threw code p1417, Cylinder 7 Reactivation Control Performance. Some of the possible causes for that code are listed below.

Low oil pressure or blocked oil passage
Faulty MDS Solenoid
MDS Solenoid harness is open or shorted
MDS Solenoid circuit poor electrical connection
Faulty Engine Control Module (ECM)

So to me it seems like the p1417 code is probably causing the p0307 code, perhaps the MDS solenoid went bad, became disconnected or shorted out somehow. But here is my real question Would a malfunctioning MDS solenoid shut off the #7 fuel injector but not the #7 coil pack? I got out my test light and the coil is still operating normally but the injector in not pulsing.

Any help or suggestions you guys have would be greatly appreciated.

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Old 11-28-2018, 04:31 PM   #2
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Old 11-28-2018, 06:48 PM   #3
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Welcome to HTC!

The computer will shut the injector off of the misfire is bad enough. The lifter in the mds cylinders are a very common failure part also.
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Old 11-28-2018, 11:40 PM   #4
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Thanks for the Welcome.

It sounds like you might be saying that replacing the lifters might be a good idea to do at the same time, as I will already have the intake manifold off.

I'm kinda at a point of trying to decide if I replace all of the MDS solenoids or just the one where I'm getting the error code. Add to that the possibility of replacing all of the lifters and this repair is starting to get a little more expensive, but I guess that is why they say buy once, cry once.

Do you know if there is a tell tale way to know if the lifters are damaged prior to pulling them and physically inspecting them? I freely admit I have very little knowledge of the MDS system so I may be mistaken in what I am about to say. But if I do correctly understand the way the MDS works I can't simply pull a valve cover and look to see if the valves are moving at idle, mainly due to the fact that at idle the MDS system would not be active and all of the valves should be operating normally. Please correct me if I am wrong in this assumption.

I just hate to pull the manifold without ordering the lifters only to need them and then have to wait a week to get them or worse yet order them and then find out that I don't need them.
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Old 11-29-2018, 05:20 AM   #5
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Old 11-29-2018, 06:26 AM   #6
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the lifters are under the heads so the heads need to come off to swap them out the intake only allows you to get to the mds solenoids that control the lifters. most times you can pull a valve cover and crank or start the motor with a bad mds lifter and see the valve and rocker setup not moving a complete stroke like it should be.
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Old 11-29-2018, 11:37 AM   #7
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Quote:
Originally Posted by charged392 View Post
the lifters are under the heads so the heads need to come off to swap them out
My mistake, thank you for the information. I guess I will have to pull the valve cover again and figure out a way to see how far the valves are moving on the bad cylinder.
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