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Mordanger

Junior Member
Joined
Dec 9, 2023
Posts
7
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3
Location
Williamsville, MO
Ram Year
2014
Engine
5.7L HEMI
Ok, notorious lifter issue fried my motor at 120k miles.
Bought a BRAND NEW 5.7 from MOPAR that came FROM MOPAR with NGK Iridium plugs.

ONLY re-used the Oil Pan, Valve Covers, & left the A/C system in tact.

20% larger injectors

BBK Shorty Headers

Spectre Air Intake

Edge CTS3 Tuner

Those were the only "upgrades" done. Had to pull the 20% injectors and buy another set of OEM because even with my EDGE Tuner on it, I couldn't adjust them out and it continued to run rich.

Now, I'm having "code P0300" - random misfires and cannot get it to stop. Any thoughts?

Running 91 Octane and feeling i should go ethanol free??
 

DILLIGAF

Senior Member
Military
Joined
May 28, 2016
Posts
4,179
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7,481
Location
Canada
Ram Year
2012
Engine
5.7
You need HP Tuner to tune it properly.

And why would you run bigger injectors on a stock motor, Instead of doing the 6.4L intake swap makes no sense to me if your looking for actual HP gains.

Could be a dozen things wrong, Get a good scanner and do some diag.
 
Last edited:

NCRaineman

Senior Member
Joined
May 26, 2018
Posts
833
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1,122
Location
NC
Ram Year
2019 1500 Classic
Engine
Hemi 5.7
Spectre intake tells me all I need to know. That's pep-boys quality tuner crap which belongs on a Honda. Seems like you've got plenty of money to throw at the problem, so do it right.
 
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Mordanger

Mordanger

Junior Member
Joined
Dec 9, 2023
Posts
7
Reaction score
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Location
Williamsville, MO
Ram Year
2014
Engine
5.7L HEMI
Spectre= Junk put an OEM or 6.4 swap, because I'm sure there is metal in old one.
I'm a pipeliner that's only home on weekends. So I just got what I could to finish it off and get it running. The plan is a 6.4 swap. But because I only get a couple hours a week(if that) to do anything with it I just wanted it running lol.
 
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Mordanger

Mordanger

Junior Member
Joined
Dec 9, 2023
Posts
7
Reaction score
3
Location
Williamsville, MO
Ram Year
2014
Engine
5.7L HEMI
You need HP Tuner to tune it properly.

And why would you run bigger injectors on a stock motor, Instead of doing the 6.4L intake swap makes no sense to me if your looking for actual HP gains.

Could be a dozen things wrong, Get a good scanner and do some diag.
The intake swap is coming, but as I told another, I'm a pipeliner and am lucky if I have a couple hours a week to work on it. So when I got close to it running I just got what I needed to get it running.
I looked at HP Tuner but alot of the articles I read had this edge tuner listed as top 3 and it was a little cheaper.
I'm the last in my family to cut corners, but I was just so tired of not hearing it lol.

UPDATE:
Put new OEM injectors and it fixed the running rich issue(as I figured it would) but now the P0300 code is still there and it is running so much rougher than before. ONE time it gave me P0301.

Removed, re-gapped and cleaned new plugs(NGK Iridiums)

Swapped coils around

Checked and tightened intake bolts

Checked wires & connections

Any thoughts on where to head next?
Cause I'm at the point of just taking it to the dealer and paying the $160 diag fee lmao...
 
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