Airstream Forums

Airstream Forums (https://www.airforums.com/forums/)
-   Sprinter and B-van Forum (https://www.airforums.com/forums/f240/)
-   -   Intake Manifold Carbon Buildup (https://www.airforums.com/forums/f240/intake-manifold-carbon-buildup-191924.html)

Ryoungca 02-06-2019 02:33 PM

Intake Manifold Carbon Buildup
 
I had a Limp Home Mode issue and my local repair guy said the codes point to sticking air control flaps on both intake manifolds. The exhaust gas recirculation system adds exhaust gas including carbon into the manifolds causing the issue.

I have about 90,000 miles on my 2015 NCV3 Sprinter. Anyone else have experience to share on issues like this and their (expensive) repair.

uraljohn 02-06-2019 07:16 PM

Induction cleaning
 
Never owned a Sprinter. However, I have owned a couple of Mercedes Diesel cars and have about 2 million miles driving class 8 diesel trucks. The induction systems need periodic maintenance. Check your owners manual scheduled maintenance recommendations and see if it suggests a mileage figure for induction system/injector cleaning. You may be well past due if this has not been done as recommended. Mercedes are expensive when new and expensive to maintain if done by the book. The upside is you can get very high mileage out of them. Get a shop that specializes in Mercedes service to take a look.

Camerons 02-08-2019 07:28 PM

Drive more
 
We used our 2015 sprinter (2016 airstream GT) sporadically when we first got it. Every Time we took a big trip something related to the DEFsystem would fail. Took it to a sprinter tuner and he said we need to drive it more and drive on highway. This tends to keep the valves and sensors related to the DEF system running. If you buy a good OBD reader and plug it in you can see when the valves have failed but not failed enough to throw a code. Better to run the codes before a big trio then get them serviced proactively. Or......drive on the highway once a week. That seems to have resolved our gremlins.

Alex AVI 02-08-2019 10:13 PM

Quote:

Originally Posted by Camerons (Post 2207999)
We used our 2015 sprinter (2016 airstream GT) sporadically when we first got it. Every Time we took a big trip something related to the DEFsystem would fail. Took it to a sprinter tuner and he said we need to drive it more and drive on highway. This tends to keep the valves and sensors related to the DEF system running. If you buy a good OBD reader and plug it in you can see when the valves have failed but not failed enough to throw a code. Better to run the codes before a big trio then get them serviced proactively. Or......drive on the highway once a week. That seems to have resolved our gremlins.

CAMERONS - What do you suggest for those of us who are seasonal users? My unit is 11 months old with 9,000 miles. But our last big trip was Dec 1, 2018. I have only used it a few times locally. I definitely can not do highway runs every week; maybe once a month is best I can do in winter times. Our 1st 2019 trip would be March. I kinda worried, because OP's unit is barely 4 yr old unit with 90,000 miles. I would think with that kind of mileage (avg +20k/yr) it has enough highway miles. Any other suggestions to do? Would just running engine at high idle stationary help? These def diesels are completely new animal to me, so everyday is a learning episode.

BurntAsphalt 02-09-2019 10:52 AM

Alex, I wouldn't spend much time worrying about your driving frequency and trip length. Longer frequent trips are probably good but you can only do what your current lifestyle and circumstances permit. I've come to accept the fact that I'm driving a vehicle with fantastic motor and trouble prone emissions control system and it is a game of Russian Roulette every time we take a trip. I'm always relieved when I arrive back home without an issue. I've had to replace the DEF tank heater and it is only a matter of time before the Nox sensors go bad. All that said, I still love this vehicle!

Alex AVI 02-09-2019 01:39 PM

Quote:

Originally Posted by BurntAsphalt (Post 2208147)
Alex, I wouldn't spend much time worrying about your driving frequency and trip length. Longer frequent trips are probably good but you can only do what your current lifestyle and circumstances permit. I've come to accept the fact that I'm driving a vehicle with fantastic motor and trouble prone emissions control system and it is a game of Russian Roulette every time we take a trip. I'm always relieved when I arrive back home without an issue. I've had to replace the DEF tank heater and it is only a matter of time before the Nox sensors go bad. All that said, I still love this vehicle!

BURNTASPHALT - Thank you for suggestion. Being my first diesel & rv all rolled into one, I always worry if I am doing right practices :D But you are right, I can only do what circumstances permit. The good thing is 75% of its mileage is highway mileage, lots of 75-80mph long runs due to higher speed limits in NV & UT, and lots of hills for high rpm runs. So, the engine and emissions stuff get to really run hot and burn off the nasty stuff :)

jcl 02-09-2019 02:08 PM

The worst thing for it is lots of short trips without a chance to get hot enough. You are likely to have some extended time of low use between trips, and you canít change that, but resist the urge to start it and idle it, or run to the local store frequently. That % figure you quote is the important one, as well as the time between those longer runs when you may want to add a highway drive in to offset any short trips.

Alex AVI 02-09-2019 03:13 PM

Quote:

Originally Posted by jcl (Post 2208210)
but resist the urge to start it and idle it, or run to the local store frequently.

JCL - Yes, so far I have been able to resist start/idle and short/store trips. But I have to be honest and say it is hard to resist because the van is so easy & fun to drive as a daily driver, it is always tempting. :)

Camerons 02-09-2019 10:30 PM

Alex we are seasonal as well. That doesnít work well for sprinters. If you drive them they work well. If they sit they break. If you canít drive it much then just be prepared for potential DEF sensor and valve failures. It sucks. Iíve owned Honda toyota Acura VW Mazda porsche and out of all the vehicles the sprinter has broken the most by a large margin. Out of all the vehicles combined I had one engine code in 40 years of driving. Then came the sprinter with 3 codes in three years (not counting the air bag code because I unplugged the seat). Each time it was a sensor replacement or the EGR valve. Now I try to take the sprinter for a blast once a week on the highway. Iím tired of loading up the van for a trip only to call the dealer and ask the to squeeze us in. The only good part is the mercedes dealer is awesome. My wife Cor gets coffee and a massage in the massage chair. Windy our German Shepherd gets treats from the staff. Still it sucks to start a trip this way.

Alex AVI 02-24-2019 01:56 PM

Quote:

Originally Posted by Camerons (Post 2208329)
Alex we are seasonal as well. That doesn’t work well for sprinters. If you drive them they work well. If they sit they break. If you can’t drive it much then just be prepared for potential DEF sensor and valve failures. It sucks. I’ve owned Honda toyota Acura VW Mazda porsche and out of all the vehicles the sprinter has broken the most by a large margin. Out of all the vehicles combined I had one engine code in 40 years of driving. Then came the sprinter with 3 codes in three years (not counting the air bag code because I unplugged the seat). Each time it was a sensor replacement or the EGR valve. Now I try to take the sprinter for a blast once a week on the highway. I’m tired of loading up the van for a trip only to call the dealer and ask the to squeeze us in. The only good part is the mercedes dealer is awesome. My wife Cor gets coffee and a massage in the massage chair. Windy our German Shepherd gets treats from the staff. Still it sucks to start a trip this way.

CAMERONS - So what is your weekly exercise routine for the Sprinter (or others here who may have their recommendations for seasonal users). I read in different forums/threads min. of 30 mins at highway speeds? Do you keep it at certain rpm and/or what engine temp do you shoot for? Today, with the nice weather, we are taking it out for a day trip. I am fortunate our open highways are close by with 70-75mph speed limits and plenty of very long hills and mountains to get engine really nice & hot.

Camerons 02-24-2019 09:21 PM

Alex. 30 min at 75 sounds perfect.

Alex AVI 02-24-2019 10:10 PM

Quote:

Originally Posted by Camerons (Post 2213424)
Alex. 30 min at 75 sounds perfect.

CAMERONS - thank you for this. The good thing about having to drive the AI even without a real destination, other than to just exercise it on a regular basis, is I love driving it to anywhere & everywhere :)

jcl 02-24-2019 10:47 PM

I would do 2 hours once a month over weekly for 30 minutes. It will take 15 minutes to get hot, and you want to run it for longer than 15 minutes once it is hot (that is when the clock starts, so to speak).

Ryoungca 02-25-2019 01:07 AM

An update on the situation that led to this thread. I retrieved the AI from the shop while waiting for them to notify Good Sam on the repair. (According to Good Sam it wouldn't be covered without an appeal but that's another story.) The engine was now operating normally though the check engine light was still on. On the way home the check engine light went out.



The shop confirmed that they did not reset the computer so it appears that the driving/engine heat allowed the butterfly valves to move again and that the engine computer cleared the codes. I've driven more than 500 miles since then without incident.



The AI had been sitting for at least a month prior to the error codes/check engine light/limp home mode. From now on it gets a periodic workout.

Titus 02-25-2019 07:39 AM

I can see how carbon build-up can be related to how it is being driven, with high loads (temperatures) being better. But I don't understand how build-up can be affected by how often it is driven. While sitting for weeks/months at a time can be bad for some things (such as injector sticking, DEF shelf life, or a high percentage of biodiesel in the tank), I don't think that carbon build-up is one of those things. But maybe there is some aspect of carbon build-up that I am missing...

gmillerok1 02-25-2019 08:43 AM

Quote:

Originally Posted by Alex AVI (Post 2208027)
CAMERONS - What do you suggest for those of us who are seasonal users? M...

My 2011 was purchased new. We use it mainly for trips in May and later in the fall and maybe a few in between. From October to April it mainly sits. We've put about 62,000 miles on it so far.

I try to take it for a drive at least once a month for 30 minutes or so. But, I can't say I've done this every month.

In eight years, I've never had a sensor failure or any other failure. I did have a couple of glow plugs go bad and replaced all of them last year as a precaution. But other than that, I have had no mechanical issues at all for what it's worth.

jcl 02-25-2019 08:49 AM

Quote:

Originally Posted by Titus (Post 2213524)
I can see how carbon build-up can be related to how it is being driven, with high loads (temperatures) being better. But I don't understand how build-up can be affected by how often it is driven. While sitting for weeks/months at a time can be bad for some things (such as injector sticking, DEF shelf life, or a high percentage of biodiesel in the tank), I don't think that carbon build-up is one of those things. But maybe there is some aspect of carbon build-up that I am missing...

You are not missing anything. There are two different aspects being discussed in the thread. I agree with you that the long drives instead of short trips, ie how it is being driven, is about the carbon buildup. Sitting unused doesn't impact the carbon buildup.

The other aspect is that some owners appear to have had issues with the vehicle related to DEF injection when left parked for extended periods. If that is the only concern, then more regular use may help. But if that use is all short trips, we are back to problem one.

LB_3 02-26-2019 02:41 PM

It looks like Ryoung is out of warranty so I would recommend an ECU tune to disable the exhaust gas recirculation so prevent future issues.

jcl 02-26-2019 03:51 PM

Vehicle warranty is only the first issue, and probably not the most important one. Deleting emission controls is illegal for on road use. It also worsens air pollution. Just say no.

GoingPhishin 02-26-2019 05:22 PM

It seems that adding Seafoam to the gas tank on a regular basis would help, particularly with those rigs sitting for an extended period of time.


All times are GMT -6. The time now is 01:17 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.