P219A code 5.7

[hunterdan]

So, I think the p219a code is kicked. Pretty sure it was addressed by the injector cleaning(s).
Still dealing with some hot restart issues and trying to iron them out. Have confirmed no injector leakage. Fuel pressure is holding after shut down, not bleeding down more than 1-3 psi. So, to me, rules out injectors and fuel pump/check valve. Fuel pressure through the PID and through a mechanical gauge line up. Only thing I'm thinking is there's a sensor that gets hot and sends some weird information back to the PCM at start up. As far as I can tell, ECT and intake temp look normal when I go to restart.
I am noticing that it doesn't start as crisp as it did on cold starts. It's better than a hot start, but it doesn't fire up as smoothly as it did. I'm wondering if maybe the cam sensor is sending some weird information back or possibly the crank sensor.
This motor hasn't been apart other than the intake manifold. Im also wondering if maybe the vvt phaser is sticking when it's hot and keeping the timing advanced. I've got a few days off coming up, so maybe I'll do an early oil change with a motor flush and see how that affects things. It certainly won't hurt to put new oil in. Oil filters have always opened up cleanly, with no signs of metal debris in them.

 

[EdGs]

In a earlier post you mentioned using Bosch O2 sensors. I wonder if that could contribute to your issues. We all know how picky our Rams are with sensors.

What kind of mileage on your Ram?

Hang in there.

 

[hunterdan]

In a earlier post you mentioned using Bosch O2 sensors. I wonder if that could contribute to your issues. We all know how picky our Rams are with sensors.

What kind of mileage on your Ram?

Hang in there.

It's crossed my mind, but I'm not ready to rule them as the problem yet. Especially now. I did some logging on the ride home via Alfaobd and saw nothing out of the ordinary. Other than for some reason Alfaobd logs the barometric pressure at some weird scaled number, around 3.17 kpa.
Anyway, one of the first things I did was to swap out my MAP and evap purge valve with aftermarket stuff. I've confirmed the evap purge valve seems to be working, but I did order a mopar unit from the dealer vendor on the site. I still have my old one, but figured I'd try a new OEM. And I decided to swap my old, OEM MAP sensor back in. I don't recall what brand it was or where I got it, I'll have to do some digging. But, the results of swapping the original MAP sensor back in were quite interesting. At idle, fuel trims were sitting around -10% on both banks. IMMEDIATELY after swapping it out and putting the OEM back in, fuel trims went positive and started bringing the LTFT back toward 0. After about 10 minutes of idling, fuel trims settled around -0.8% on both banks. It still had a rough first start immediately after installing the map sensor, but it thinking i wasn't dealing with a rich mixture from a leaking injector, I was dealing with a lean mixture from a bad reading from the MAP sensor and thus the hot restarts were running too lean and had to immediately add fuel back. I'm going to run this for a week or so and see how that goes. I'm really hoping to see all my LTFT's end up closer to 0 or even slightly positive (due to increased airflow from intake mods).
So, hindsight, I believe my p219a codes were injector related, and have subsequently been resolved. Fyi, I'm currently back to running my original, OEM injectors that I cleaned once again and replaced the baskets again with some different ones. The aftermarket map sensor was reading normal, consistent numbers, so it didn't seem like it was bad or faulty. But, obviously based on what I just saw, it's got a different calibration or something.

 

[04fxdwgi]

If you are doing logging with AlfaOBD, are you using PC or Android version? Which OBD dongle you using? I use the PC version and the OBDLink MX+. OBDLink does have a free download PC software called OBDWiz which has a great data logging and a charting capable module.

I would think that doing some drive cycles and an ECM relearn may help.

 

[hunterdan]

I'm not using the log function, but I'm tracking multiple sensors at a time (I think the more it tracks the slower the resolution gets) so it gets kind of pointless. But I'm using Alfaobd and the obdlink app.
Ironically, after swapping the factory map sensor back in, things look much better. Now, I skewed things yesterday by sucking some redline up into the intake to try and clean any residual residue that may have been left from my manifold cleaning and it's thrown my idle trims off (expectedly) but things are looking FAR better.
So here's what I think happened, in order...
Years ago, catch can ran full for several months, gunked up the intake.
Replaced plugs in December of 2025
Cleaned intake manifold April 2025
Replaced cats and upper O2 sensors in May 2025 as truck still felt lacking.
Immediately, truck felt and ran better, but p219a code popped up. Looking back at my pictures from cleaning the intake, cylinder 8 looks like it had a leaking injector. (Explains poor mileage, rough hot starts). But, shortly after p219a code popped up. Why it was on bank1 and not bank 2, not sure unless I had some partially clogged injectors on bank 1 throwing things off.
Replaced MAP and evap purge valve with aftermarket parts trying to troubleshoot. P219A continues to come back.
Initially clean injectors and p219a goes away, but fuel trims are still way negative at idle (-10%). But truck is running AMAZING with great mileage.
P219a comes back AFTER a switch from fuel with lots of techron and redline in it to straight fuel but clears itself.
Decided to rebuild injectors to address heavy negative idle fuel trims. This went badly, rough starts, seemingly leaking injectors. Ordered replacements. Not much better, but dropping fuel pressure went away and hasn't come back. I rebuilt the OEM injectors AGAIN using different baskets and better o-rings (used injector shop parts before) and soaked the original injectors in redline and techron for 2 days and ultrasonic cleaned and flushed them using my tester. At this point, still dealing high negative idle fuel trims and rough starts, so I put the original injectors back in again. No real change, but still have real rough hot restarts and even cold starts struggle. Fuel pressure at start is great, starting at 58 psi and jumping to 62 as it cranks. What I was mistaking as being overly rich at start up, I believe was actually overly lean. Because immediately after a hot restart, fuel trims would go very positive, trying to add fuel, not remove it. So, that's when I decided to swap the old OEM MAP sensor back in (cleaned it first) and fuel trims immediately went positive at idle where LTFT were sitting at -10%, they eventually went to only -2% after idling 10-15 minutes.

Ling winded I know, but I had multiple issues going on and the new oxygen sensors are the reason I found it. The old ones were too slow in responding to pick up the issues

 

[hunterdan]

I'm still having some rough start issues, but I'm hopeful that as the PCM relearns the values from the MAP sensor and continues to correct mixtures, the hot start issues get corrected. Cold starts already seem much better with zero hesitation.

 

[Sherman Bird]

Wow.
That DTC is germane to an injector circuit, NOT exhaust!
Perhaps get it diagnosed by a professional and THEN fix it.