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Landscaping Professional
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Discussion Starter · #1 ·
My son's 2010 Ram has a problem on moderate to heavy accel where it "lays down" starts missing and sets a MIL code for #5 cyl misfire.

We put new plugs in, and changed the coil pack but it didn't help. We can hear a tapping at #5 valve cover. Went to RAMforumz and searched for similar. A guy with a 2011 who described the same problem got blown off by the dealer. He pulled a valve cover and posted a short video clearly showing incomplete valve lift on #5.

I'm dropping the truck at my dealer on Friday to see what they figure out. Let's hope that 5/100 powertrain warranty does what it's supposed to do.
 

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Landscaping Professional
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14,157 Posts
Discussion Starter · #3 ·
Yeah, we were wondering if the MDS could be the issue, but my Snap-On scanner can't read that. At least no codes set.
 

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Landscaping Professional
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14,157 Posts
Discussion Starter · #5 ·
What's the deal - did they not heat treat a batch of them after grinding?
 

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14,157 Posts
Discussion Starter · #8 ·
OK - the answer was the intake lifter for #5 somehow turned sideways and ground down the cam lobe. New parts installed and all covered under standard powertrain warranty - except for the engine oil.
 
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