View Single Post
  #18  
Old 11-02-2011, 01:30 AM
SeattlePete's Avatar
SeattlePete SeattlePete is offline
Dodge Ram Forum Senior Member!
 
Join Date: Oct 2011
Location: Seattle
Age: 51
Posts: 275
Gender: Male
Vehicle: 2011 SLT CC 4x4
Trim Level: SLT
Color: Mineral Gray Metallic
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
Rep:24
SeattlePete is on a distinguished road
Default

"Rod knock" is not the conrod itself, but the rod bearings. If the rod bearings were shot, you'd know it- sounds like angry gnomes with hammers trying to beat their way out.

Your change from Durablend to full synthetic isn't a concern, as the viscosity is the same.

Never heard of 'valve tap' on an engine with hydraulic lifters- unless the valvetrain is loose.

Has any work (plugs, wires, filters, etc) been done to the truck?

You mention you had somebody romp on the throttle. I'd start there, especially as you had a non-stock tune in the truck. IMO, Hypertech's heyday was about 20 years ago, and they are way behind the power curve with regards to tuning/programming. When I used HT, the timing curve was always way advanced, and their chips did a fair amount of damage to folks in the Grand National community. If the guy romped on it and it went way lean/detonated, you may have broken something internally, like a ring land. A knock sensor can pull timing only so fast, and damage can still happen....

Put the truck back to stock, and toss the HT tuner. Get the truck looked at- compression and leakdown tests, check the injectors and fuel pump pressure, timing, etc- the basics.

Once you get the truck running good, get a Predator or Trinity to tune the truck with. Learn what the tuner can and can't do, as its very easy to destroy the engine by adjusting parameters without understanding the ramifications.....
Reply With Quote