Egr fault mass flow to high

[Onyx610]

2 minutes ago, Mackpro said:

Lol , your right .  I corrected it . 

You really had me thinking for a min, I was like is it another term for a test light??

[mdixon]

I'm hitting temps in 10 minutes, dpf dp is .490 max. I inspected the dpf and doc, blew them down and and replaced all the clamps and gaskets 2 weeks ago. Mine went the other way, egr valve first. Came back with same code, replaced the egr venturi with the plastic 1 piece and a new sensor, and the temp sensor because the wiring had chuffed bare. 

 

Is there a software update when replacing the venturi? I can check software lvl tomorrow, I'm pretty sure it's been updated within a year.

[mdixon]

4 minutes ago, Onyx610 said:

Yea, if they are going into the negatives I think that’s a good place to start. Just odd he’s not seeing any fault codes. 

I'm pretty sure they present as mass flow codes. That's what the ecm uses to calculate lb/min with. 

[mdixon]

Low temps will increase mass calculation significantly, and will cause over fueling, and clogging of the dpf. Same with intake/charge pipe temp sensors.

[Onyx610]

Yea I forgot that mass air flow code was basically what this was about and not just not completing regen. 

[Mackpro]

6 minutes ago, mdixon said:

I'm hitting temps in 10 minutes, dpf dp is .490 max. I inspected the dpf and doc, blew them down and and replaced all the clamps and gaskets 2 weeks ago. Mine went the other way, egr valve first. Came back with same code, replaced the egr venturi with the plastic 1 piece and a new sensor, and the temp sensor because the wiring had chuffed bare. 

 

Is there a software update when replacing the venturi? I can check software lvl tomorrow, I'm pretty sure it's been updated within a year.

That all sounds good actually.  Good that you got the new EGR sensor on there. What’s your spot level dropping to? 

[mdixon]

When testing the egr valve everything works exactly like the test procedure says it should. With a cold engine opening the egr valve nearly stalls the motor, turbo speed starts >40k drops to <5k fast.

Just now, Mackpro said:

That all sounds good actually.  Good that you got the new EGR sensor on there. What’s your spot level dropping to? 

Soot level drops 20% every regen. Started at 140 or so. Ash level reads 0.

[mdixon]

Down to 40ish% now. Boss wants to run it and see what happens, I've had it laid up for 2 weeks between parts and other jobs.

[Mackpro]

9 minutes ago, mdixon said:

I'm hitting temps in 10 minutes, dpf dp is .490 max. I inspected the dpf and doc, blew them down and and replaced all the clamps and gaskets 2 weeks ago. Mine went the other way, egr valve first. Came back with same code, replaced the egr venturi with the plastic 1 piece and a new sensor, and the temp sensor because the wiring had chuffed bare. 

 

Is there a software update when replacing the venturi? I can check software lvl tomorrow, I'm pretty sure it's been updated within a year.

Not many software updates come out for the older trucks so if you had it updated within the last year it’s probably has the newest software in it. If you had Tech Tool  you could do a “learned data reset “  so the ECM could learn the new sensors.  Also re-set the “ Adaptive Factor “ for the 7th injector when they are replaced or cleaned . 

[mdixon]

6 minutes ago, Onyx610 said:

Yea I forgot that mass air flow code was basically what this was about and not just not completing regen. 

Yeah I did the egr valve in November, it came back 2 weeks later with the dash lit up with the same code.

[Onyx610]

And also soot level of a cleaned or new dpf

[mdixon]

2 minutes ago, Mackpro said:

Not many software updates come out for the older trucks so if you had it updated within the last year it’s probably has the newest software in it. If you had Tech Tool  you could do a “learned data reset “  so the ECM could learn the new sensors.  Also re-set the “ Adaptive Factor “ for the 7th injector when they are replaced or cleaned . 

I did a reset with the bosch tool. Adaptive value was at 1 and wouldn't allow a reset. 

 

That TSB on the connector pins sounds like a possibility

[mdixon]

You'd think soot level would drop to zero after a successful regen, I only blew it out with shop air. Definitely not a real cleaning lol. Damn thing looked great too, no melts, missing squares. Doc wasn't sooted up either. Visible inlet, no cracks or evidence of overheating.

[Mackpro]

https://static.nhtsa.gov/odi/tsbs/2018/MC-10148618-9999.pdf   We we’re on the verge of changing some EGR coolers that looked clean but had fault codes for clogged/low flow . We changed the temp sensor and harness ends and this solved several problems 

Edited December 29, 2022 by Mackpro

[mdixon]

7 minutes ago, Mackpro said:

https://static.nhtsa.gov/odi/tsbs/2018/MC-10148618-9999.pdf   We we’re on the verge of changing some EGR coolers that looked clean but had fault codes for clogged/low flow . We changed the temp sensor abs harness ends and this solved several problems 

This looks like a winner. That's awesome.

[Mackpro]

59 minutes ago, mdixon said:

You'd think soot level would drop to zero after a successful regen, I only blew it out with shop air. Definitely not a real cleaning lol. Damn thing looked great too, no melts, missing squares. Doc wasn't sooted up either. Visible inlet, no cracks or evidence of overheating.

Sometimes you just never get them to zero . I’ve done good hot regens and only got them into the low 30%. Trick is how much they rise after a few hours of driving. Sometimes the soot level will jump up a lot in the first 15-20 miles of driving and then a super slow crawl  rise . I’ve left the shop at 20-25% soot and in 15 miles it jumped to 45%  and was normal. Now after my 40 mile test drive if I was above 65-70%  ( and I’ve hit 100 +% in 20 miles before) I would pull the filter and have it cleaned and check turbo, EGR system and boost leaks . 

Edited December 29, 2022 by Mackpro

[mdixon]

Well I'm back. Truck has returned. Most of the codes showed up yesterday, the egr code is leftover from my work before, hasn't been active since 12/28. About to run a parked regen and see what happens.

[mdixon]

Right now

[mdixon]

Talked to the rep about repinning the harness, he "can't find the part #s" and they don't have the connector chest. 

 

Looks like I'm gonna do a wiring harness. Still getting weird EGR jumps in the temp and dp

[Mackpro]

I always like to see the T2 temp at 880 . The DPF Differential pressure is not to bad at .367 if it was above .6 or higher I pull the filter and have it cleaned. Are the turbo codes new ? 

[mdixon]

Yeah, showed up yesterday. Temps went over 900 for 10 minutes, then stopped. Soot dropped to 104 from 144. No Codes showed up. It was raining yesterday, all codes popped yesterday except the egr code and that was from when I had it last. Everything is cleared now, running another regen.

Edited January 27, 2023 by mdixon

[mdixon]

Attempt #3. Soot dropped only 5% after regen #2. Running SCR regen now.

 

Everything looks good. I don't understand what the problem is. 

 

 

 

Edited January 27, 2023 by mdixon

[fjh]

So not being a Guru on this How ever Our guys used to look at the fuel preasure to the 7th the reg to that injector would go fubar and need replacing or shimming could this be the case here?

just asking! MP OXY ?

[Onyx610]

Yup FJH, your more of a guru then you think, I’d like to see fuel pressure number and the turbo actuator code should be considered. 

[Mackpro]

In my notes for your model . The fuel doseing rate should be between 5% to 19% to be normal. Your is at 12% which is perfect. 22-29% usually mean clogged 7th injector. This is only for your year model. Other years are much higher. With the key on/engine off , what is your EGR differential pressure? And also what is the DPF differential pressure reading key on/engine off?