6.7 cummins check engine light comes on with DPF delete

[CoreyZ71Sierra]

First off i know this is a chevy forum but someone might be able to give me some advice. Alright i found a a really nice 08 6.7L with 54,000 miles the guy did the DPF delete and put a 5" turbo back exhaust on it with a smarty. He said every 3 or 4 months the check engine light comes on and says about the DPF delete and he just clears it with the smarty and it's fine. Is this something to be worried about? I just don't want to spend 30 grand on a truck and have a bunch of problems with it. He said he didn't do the EGR delete yet but it's only around $65 to do.

[RednckChevy]

Me personally I would set it back to normal cause if anything was to happen cummins willnit warranty that motor. I still don't understand why so many people supe up a diesel when stock is still powerfull enough for DD. My dad has an 05 ram dually with the 5.9 all stock and he pulls a 36 foot fifth wheel from central cal to washington every year to visit. The only thing he wants to change is put an exhuast brake on. But he pulls the big grades doing 55-60

[Mark13]

Me personally I would set it back to normal cause if anything was to happen cummins willnit warranty that motor. I still don't understand why so many people supe up a diesel when stock is still powerfull enough for DD. My dad has an 05 ram dually with the 5.9 all stock and he pulls a 36 foot fifth wheel from central cal to washington every year to visit. The only thing he wants to change is put an exhuast brake on. But he pulls the big grades doing 55-60

Once you've been in a well tuned diesel you'll understand. And tuning them along with getting rid of the DPF crap really helps fuel milage. A friend of mine has a 6.4 Powerstroke that he removed the emissions stuff on and is running a 250hp tune and his fuel milage doubled from what it was stock. His brother has a 6.7 cummins with the emission stuff removed, egr deleted, intake opened up and a smarty and his fuel milage increased by 35-40% over what it was stock. On my Dmax just loosing the cat and muffler gave me 1mpg. Combined with other things I've done to it I've picked up probably 4-5mpg. If I drive nice I'll see 17ish mpg around town/country roads and 21-22mpg on the hwy cruising at 65.

[RednckChevy]

must not have smog regulations like california does...lol..Cali is cracking down on deisel tuning. as far as mileage on my dads ram unloaded is usually around 21 on the highway with cruise set at 70

[Mark13]

must not have smog regulations like california does...lol..Cali is cracking down on deisel tuning. as far as mileage on my dads ram unloaded is usually around 21 on the highway with cruise set at 70

We have nothing here on diesels. All of us are running 4" turbo back straight pipes and we all have the egr stuff either removed or blocked off.

[RednckChevy]

in cali they are doing big time smog checks on deisels and now in washington they are doing NOX testing. even if cali wasnt having such big regulations on deisels my old man would still keep his stock

[Hatfieco]

With the smarty you should be able to completely tune out the need for a dpf. All its doing is try to go into regen and clean out the dpf, when its not there and senses it theres a check engine light. Most are going to urea injection anyways so dpfs are a waste. Where you live id go for it. Like the second guy said though, your warranty has been voided.

[RednckChevy]

Even putting a cai or a high flow air filter will void a cummins engine warranty

[il_DURAMAX]

Yea normal, even with tuning it out youll still get error codes for DPF, Catalyst Full, Perform Service, etc... Until you delete the codes.

[il_DURAMAX]

Even putting a cai or a high flow air filter will void a cummins engine warranty

It Can, yes... But VERY unlikely.

There are plenty of mod friendly dealers out there too, that look past those things.

My advice is, if you start modding things, keep your OEM parts in case of warranty issues

[Hatfieco]

Even putting a cai or a high flow air filter will void a cummins engine warranty

What makes you say this? None of the dealerships my dodge has ever been too mentioned the intake or exaust. The chip however was always removed.

[454jeff]

the latest smarty file (23me?) was supposed to take care of that occasional cel. When I had my 6.7 I had the same problem, I just reloaded whatever tune I was running at the time. I hope he's including the smarty with the truck. Also, I'd try to get any of the old emissions parts that you can. If you ever decide to sell or trade the truck you could run into some real problems with all of the emissions stuff missing. That stuff ain't cheap if you were to have to replace it.

Jeff.

[redchevy914x4]

They dont remove the DPF and EGR just to get more mileage, they also remove it to keep all that nasty exhaust and carbon out of the engine.

[cancritter]

They dont remove the DPF and EGR just to get more mileage, they also remove it to keep all that nasty exhaust and carbon out of the engine.

yes most this stuff is basic stuff,,,DPF and EGR deletes are a must for these trucks...havent touched mine yet and will leave it alone till warentee runs out

there are how to threads at cummins.com to do dpf and egr deletes with picks..is quite informitive
as for dealers voiding warenttees wouldnt be surprised...lm not giveing them a ich till my warentees done..as said are some dealers that dont care..are others that will look for any little excuse

http://www.cumminsforum.com/forum/6-7l-cab-chassis/107158-c-c-dpf-delete-how-w-pics-number.html

[mook62]

The DPF (Diesel Particulate Filter) and DOC (Diesel Oxidation Catalyst) and later engines that use SCR (Selective Catalyst Reduction) Urea. depend on ALL of these items being in place for the engine to run properly. Removing them partially WILL cause longterm damage to the engine. In order for the DPF to work, the engine calibration has to have post main injection events, this sends raw fuel to the DPF once the proper temperature is reached then the regen occurs.

There are two types of regen, Active and Passive. Active regens happen when the truck does not reach the critical temp on it's own to burn off the particulates in the system. The DOC works in conjunction with the DPF to meet current emissions standards. If you get rid of the DPF and NOT the DOC. The DOC WILL clog and will need to be either replaced or removed completely.

Passive Regen happens when the truck is going down the hiway and is reaching the Lite Off temps. Hiway driving, trailer towing etc.

Just removing the DPF and not recalibrating the will mean that the DOC will be damaged and or poisoned pretty quickly.

[cancritter]

theyve got all this stuff sorted out...follow directions on link

[LetsRock]

With the smarty you should be able to completely tune out the need for a dpf. All its doing is try to go into regen and clean out the dpf, when its not there and senses it theres a check engine light. Most are going to urea injection anyways so dpfs are a waste. Where you live id go for it. Like the second guy said though, your warranty has been voided.

2010 and later models have DPF as well as SCR (urea injection) emissions equipment installed. A diesel particulate filter system filters soot out of the exhaust while the urea injection reduces NOX emissions. I have been through training on these systems on class 8 trucks and the SCR systems are working in tandem with the DPF to clean the exhaust. The next step in diesel emission reduction regulations will force manufacturers to put scrubber systems on the engines to reduce C02 output an they say that will be in addition to DPF and SCR.

Companies are looking to CNG engines to get away from the high cost of diesel engines wether its the purchase price or the maintanence of them. My employer is constantly sending DPF equiped trucks to the dealer for failures. one truck had to have nearly everything on the DPF system replaced, a 2009 at a cost of $6700.

Be careful about removing emissions equipment and talking about it on the internet. EPA people browse these forums and have burned people for doing mods that are illegal. They can and will impose fines and penalties. Be careful...

[Diesel Dan LB7]

the only piece of emissions equipment my LB7 has is a muffler :nana: