High idle issue after Cam/Lifter installation

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Red Deer Ram

Member
Joined
Aug 29, 2021
Posts
30
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Location
Red Deer, AB
Ram Year
2012
Engine
5.7 Hemi
I have been trying to track down the source of a high idle problem since I replaced my cam, lifters, springs on my ’12 Ram 5.7. Stage 1 Comp Cam, Johnson drop in lifters, Comp Cams springs. Low mileage 5.7 (70K) and a good runner before the overhaul. Did the Electric fan swap out, HP tuner software.
I have been over all sources of possible vacuum leaks. Intake has been off twice looking for problems. All new gaskets, and even replaced the fel-pro intake gaskets with OEM’s. pressure tested the intake system twice, including the intake when it was off… she’s tight. Replaced IAT, MAF, and tried a second throttle body. My tuner has the idle set for 704 rpm but she runs around 900 and fluctuates/surges +/- 50 rpm. It seems like a vacuum issue… when I tried the second throttle body it actually raised the idle a bit. I have done relearns using the HP tuner software each time the TB was messed with. It also has a quick surge before the idle settles down after revving. My tuner has been helpful, but he’s not my mechanic. We can’t get the idle to settle and it’s not making the power it should. Starts great, no misses. It’s hard to tune some that has a bug somewhere.
Does anyone have any suggestions?
Thanks in advance…
 

DILLIGAF

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Canadian Forces
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Ram Year
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Engine
5.7
Who did your tune ? That idle seems a bit low to me. 750rpm is the sweet spot. Mine is up to 800 ATM since is Cold AF in AB. lol...

Here is the log template I use, Log it and send it back to me and ill compare it to mine.

 
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Red Deer Ram

Red Deer Ram

Member
Joined
Aug 29, 2021
Posts
30
Reaction score
19
Location
Red Deer, AB
Ram Year
2012
Engine
5.7 Hemi
Thanks Dilligaf, I’ll tackle that tomorrow. Mark Rojee did my initial tune, and has helped with a couple additional, but as long as I am not running right it’s kinda tough for him. I appreciate another set of eyes on this.
 

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