Emission monitors not completing

Hemi395 · Nov 9, 2019

Hey guys, looking for some insight and direction. My 2013 1500 Hemi won't complete all the emissions monitors. I drove it for over 1000 miles and the fuel system and EGR system monitors will not complete. It isn't setting any codes so I have no idea where to begin. I have Torque and OBDLink (can look at mode 6 data) on my phone and have been monitoring things for the last couple weeks. What I've found is the fuel system values are out of range but the O2 sensors look fine to me.

Here's a couple screen shots of the data. The mode 6 shows the fuel values out of range, the second is a screenshot of the O2s and fuel trims going down the highway at 60.

Unfortunately here in the people's republic of Massachusetts, they require all but 1 monitor to be set to pass emissions. So before I shell out money to my mechanic, does anyone have any ideas what to look into?

chrisbh17 · Nov 9, 2019

Cant tell, are those too lean or too rich?

Service manual says to create a lean condition by removing engine vacuum lines (does not specify which one(s) ) and then see if the values go from rich to lean. If they do, the sensors are "stuck rich".

If they are already too lean, you want to trigger a rich condition (per the service manual) but it does not explain how to do that.

Hemi395 · Nov 9, 2019

Honestly I have no idea[emoji23]

LT fuel trims suggest it's neither.....

chrisbh17 · Nov 9, 2019

Cheapest and easiest bet might be O2 sensors. May be right on the edge of good/bad, especially now with winter gas, cold weather, etc.

CT deals with similar emissions BS....I hate it because most of it is like a shot in the dark, or pay hours of labor to kinda sorta find the issue and then more $$$ on top of that to actually fix it.

Hemi395 · Nov 9, 2019

chrisbh17 said:
Cheapest and easiest bet might be O2 sensors. May be right on the edge of good/bad, especially now with winter gas, cold weather, etc.

CT deals with similar emissions BS....I hate it because most of it is like a shot in the dark, or pay hours of labor to kinda sorta find the issue and then more $$$ on top of that to actually fix it.

Think I should just change all 4 to be safe? I was kinda thinking of doing that since the truck is basically 7 years old now. It just hit 60k a couple weeks ago...

Yeah emissions testing has become ridiculous. There is literally nothing wrong with the truck, mpg hasn't changed, it runs fine, etc but if I don't get this fixed this will fail in May. Stupid.

chrisbh17 · Nov 9, 2019

Yep....my last truck had the famous "small evap leak". Short of getting someone to do a smoke test, I replaced things I could actually get to. Nothing fixed it.

I basically *stumbled* on the solution because the bed rusted out so I took it off to work on it, and found a half-rusted solenoid mounted on top of a frame rail between the frame and truck bed. Couldnt see it from underneath, only accessible if you removed the bed. So stupid. $15.00 part and my evap leak was gone. SMH.

Didnt do a damn thing about how the truck ran, but it didnt pass the evap test so it would auto-fail the emissions test.

Im not sure how easy the sensors are in the RAM to get to. Also not familiar enough to know which one it really uses (some use up and downstream, some use downstream only, etc). If you can get to all 4 and they arent expensive, I think I would try it.

Another option is to see if there are any TSBs that might apply. 3 cars ago I had a CEL from an O2 sensor that was fine, but the PCM s/w wasnt allowing a wide enough variance in the values before it triggered the CEL. Had the PCM s/w flashed and never had the issue again.

daveray9 · Nov 9, 2019

I know you got the JBAs done the same time as me... and we are both running the 93 tune. Whats your MPG look like out of curiosity? Mines floating around 12-13 which I didn't think would be that bad. I'm with Bils at 2.1 and only 33 AT tires. There is still an odd smell in the cab when I let it sit and startup in the mornings but I have checked everywhere for leaks and don't see one.. (or hear one for that matter). Then I thought maybe there was a small crack in the dipstick tube from having it bent to fit, but can't see the whole thing. I was contemplating switching out the o2 sensors myself to see if it helps. Just curious, maybe off topic. Sadly I live in the same state... think emissions is bad take a look at what they are doing with the firearms laws.

Hemi395 · Nov 9, 2019

daveray9 said:
I know you got the JBAs done the same time as me... and we are both running the 93 tune. Whats your MPG look like out of curiosity? Mines floating around 12-13 which I didn't think would be that bad. I'm with Bils at 2.1 and only 33 AT tires. There is still an odd smell in the cab when I let it sit and startup in the mornings but I have checked everywhere for leaks and don't see one.. (or hear one for that matter). Then I thought maybe there was a small crack in the dipstick tube from having it bent to fit, but can't see the whole thing. I was contemplating switching out the o2 sensors myself to see if it helps. Just curious, maybe off topic. Sadly I live in the same state... think emissions is bad take a look at what they are doing with the firearms laws.

Around town it's about 13-14, highway it's anywhere from 17-20+. I have bils at 2.8 and stock tire size AS Michelins.

But it's always had mpgs like that even when it was bone stock.

Have you checked the header bolts? 2 of mine loosened up but I didn't have any leaks. That's was back in July.

I'm assuming you've passed emissions since you had the JBAs put on? Mine passed fine in May running them and the 93 tune...

Don't get me started on gun control here[emoji23][emoji23][emoji23]

jvbuttex · Nov 9, 2019

Hey guys remember emissions aren't just about how a engine runs, its about those awful gas vapors from the fuel in the tank... if they are not getting sucked into the engine properly and burned, then they are leaking into the atmosphere... and that is so much worse then the car in front of you driving down the road spewing out blue smoke... LOL...

OCDTech · Nov 9, 2019

Shooting in the dark, but i was trying to find conditions that need to be met for certain monitors to run, I keep seeing something with the intake air temp, and the engine coolant temp need to be close for one or two of the monitors to run. Maybe check with the app first thing in the morning key on engine off and see if those two make sense, ( close in temp/not wildly out of range)

Hemi395 · Nov 9, 2019

OCDTech said:
Shooting in the dark, but i was trying to find conditions that need to be met for certain monitors to run, I keep seeing something with the intake air temp, and the engine coolant temp need to be close for one or two of the monitors to run. Maybe check with the app first thing in the morning key on engine off and see if those two make sense, ( close in temp/not wildly out of range)

Thanks, I'll check that tomorrow morning [emoji106]

Hemi395 · Nov 9, 2019

jvbuttex said:
Hey guys remember emissions aren't just about how a engine runs, its about those awful gas vapors from the fuel in the tank... if they are not getting sucked into the engine properly and burned, then they are leaking into the atmosphere... and that is so much worse then the car in front of you driving down the road spewing out blue smoke... LOL...

Don't get me started on that[emoji23][emoji23][emoji23]

OCDTech · Nov 9, 2019

Meant to put this link in there, https://www.nyvip.org/PublicSite/OBDII/helping-set-monitors.html

Hemi395 · Nov 9, 2019

OCDTech said:
Meant to put this link in there, https://www.nyvip.org/PublicSite/OBDII/helping-set-monitors.html

Great info!!

U&A · Nov 9, 2019

Dang you guys. All this stuff is way over my head.

Sent while firmly grasping my redline lubed RAM [emoji231]

daveray9 · Nov 9, 2019

Hemi395 said:
Around town it's about 13-14, highway it's anywhere from 17-20+. I have bils at 2.8 and stock tire size AS Michelins.

But it's always had mpgs like that even when it was bone stock.

Have you checked the header bolts? 2 of mine loosened up but I didn't have any leaks. That's was back in July.

I'm assuming you've passed emissions since you had the JBAs put on? Mine passed fine in May running them and the 93 tune...

Don't get me started on gun control here[emoji23][emoji23][emoji23]

Mine always floated around 17-20 on the highway but after the BFGoodrich All Terrains and then the JBAs I'm never going higher than 15-16. Might have a shop take a look at the headers/exhaust. Feel like the shop that did them sucked lol.

Hemi395 · Nov 9, 2019

daveray9 said:
Mine always floated around 17-20 on the highway but after the BFGoodrich All Terrains and then the JBAs I'm never going higher than 15-16. Might have a shop take a look at the headers/exhaust. Feel like the shop that did them sucked lol.

I would get that checked out. That seems like a big drop for tires and 2.1. Stock size?

Depending on where you are, I had my JBAs put on at Village Garage in Marston's Mills. They did a great putting them on and they told me to check the bolts after a month or two. I forgot and that 2 loose bolts was the result lol

Hemi395 · Nov 9, 2019

U&A said:
Dang you guys. All this stuff is way over my head.

Sent while firmly grasping my redline lubed RAM [emoji231]

LOL I know some of this stuff but without a code to give direction I'm lost[emoji23]

Hemi395 · Nov 10, 2019

OCDTech said:
Meant to put this link in there, https://www.nyvip.org/PublicSite/OBDII/helping-set-monitors.html

Checked this morning on cold start and the air intake temp and coolant temp were within 3 degrees of each other....

OCDTech · Nov 10, 2019

Hemi395 said:
Checked this morning on cold start and the air intake temp and coolant temp were within 3 degrees of each other....

That was my only guess.. don't suppose you remember a mod or change you made before it started this? Also you can check an O2 sensor by running rich with propane i believe, but i'm afraid of explosions and fire so i don't know if i would check it that way, i seen that suggestion earlier in the thread. LTFT don't look too far out of wack to me.

Heres a more specific link, EGR electronic https://justsmogs.com/2014/01/chrys...rocedures-to-complete-obd-readiness-monitors/

What does your temps get up to?

Also says unstable idle may cause not to run.

Emission monitors not completing

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