2018 diesel recall - Page 2 - TerrainForum.net: GMC Terrain Forum
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post #11 of 31 (permalink) Old 01-26-2018, 02:04 AM
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Re programing is not a bad repair, but the particulate sensor would have me worried about the catalytic converter down the road.

and....may exhibit a condition in which the engine surges up to 2,800 RPM while coasting or braking, but only in extremely rare circumstances.

Now that would have me a little bit worried.
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post #12 of 31 (permalink) Old 01-26-2018, 07:43 AM
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Re programing is not a bad repair, but the particulate sensor would have me worried about the catalytic converter down the road.

and....may exhibit a condition in which the engine surges up to 2,800 RPM while coasting or braking, but only in extremely rare circumstances.

Now that would have me a little bit worried.
Reading this made me think - Do Diesel vehicles have a Catalytic Converter ? I am not up on diesel technology...obviously !

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post #13 of 31 (permalink) Old 01-26-2018, 12:08 PM
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Reading this made me think - Do Diesel vehicles have a Catalytic Converter ? I am not up on diesel technology...obviously !

They do . . of sorts. . they have a DPF . . Diesel Particulate Filter. And, every so often, the engine must go into a "Regen" cycle to add the DEF. . pig urine . .. to clean and burn off the particulates that accumulate.

At least, at this point, this is the understanding I have. I am sure there may be other stuff that enters into the fuel/exhaust/ emmisions diesel equation.

Others will chime in I am sure.

Cheers! 50F here to day and tomorrow. Woo-hoo . . . January thaw.

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post #14 of 31 (permalink) Old 01-27-2018, 11:39 AM
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They do . . of sorts. . they have a DPF . . Diesel Particulate Filter. And, every so often, the engine must go into a "Regen" cycle to add the DEF. . pig urine . .. to clean and burn off the particulates that accumulate.

At least, at this point, this is the understanding I have. I am sure there may be other stuff that enters into the fuel/exhaust/ emmisions diesel equation.

Others will chime in I am sure.

Cheers! 50F here to day and tomorrow. Woo-hoo . . . January thaw.

Sorry .you mixed the 2 things a bit....

DEF is injected to convert Nitrous oxide to Nitrogen and water over a catalyst. That is separate from DPF...so yes there is a Catalyst section in the exhaust.

The DPF is a filter that traps cabon particles (soot) and then once in a while the computer runs the exhaust hot to burn the trapped soot ...that process is called regen.
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post #15 of 31 (permalink) Old 01-27-2018, 12:01 PM
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The "regen" system is causing big problems on several brands of tractors if they are not run at full throttle all the time.
Lots of unhappy farmers
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post #16 of 31 (permalink) Old 01-27-2018, 12:05 PM
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Sorry .you mixed the 2 things a bit....

DEF is injected to convert Nitrous oxide to Nitrogen and water over a catalyst. That is separate from DPF...so yes there is a Catalyst section in the exhaust.

The DPF is a filter that traps cabon particles (soot) and then once in a while the computer runs the exhaust hot to burn the trapped soot ...that process is called regen.

Yes two parts/steps to clean the Diesel by products,

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post #17 of 31 (permalink) Old 01-27-2018, 05:17 PM
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We've had ours for almost two weeks and have almost 700 miles on. We haven't received the letter yet.

Our first tank hand-calculated out to 33.8 in mixed driving, with the majority of those miles being the wife's 30-mile round trip commute. I'm getting ready to top it off again, and I'll update my reply when I do.

If this fix and/or reflash significantly diminishes the power or mileage of our new Equinox, I'm not going to be a happy camper......

*Update* tonight's fill-up of 13.11 gallons (In 473.5 miles) calculated out to 36.117 mpg.

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post #18 of 31 (permalink) Old 01-27-2018, 05:28 PM
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The "regen" system is causing big problems on several brands of tractors if they are not run at full throttle all the time.
Lots of unhappy farmers
Same thing will happen to people who use diesel cars for in town driving only (it is not all the time at least in cars but you'll be warned to drive it at above 30 mph for 25 to 30 mins continuously). Living in rural NM, we do lots of small roads, dirt roads (speed of less than 15 mph for 20 to 30 miles regularly) and highway combinations (65 and 75 mph). I have never sensed when it did a regen and it must have done a few by now...have 4800 miles on it now and 4.5 months since we bought it.
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post #19 of 31 (permalink) Old 01-27-2018, 05:40 PM
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Yes two parts/steps to clean the Diesel by products,
Indeed but if you are environmentally concerned ..modern diesels are less polluting than gasoline engines now

https://phys.org/news/2017-07-diesel-gas.html

This article is slightly incomplete for the fact that the DEF injection system now remove most of the Nitrogen oxide of diesels.
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post #20 of 31 (permalink) Old 01-27-2018, 10:08 PM
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Same thing will happen to people who use diesel cars for in town driving only (it is not all the time at least in cars but you'll be warned to drive it at above 30 mph for 25 to 30 mins continuously).
I need to remember that as it sounds like a diesel would not be a good choice for us. Both my wife and I can go for weeks without driving more than 2 or 3 miles at a time.
Small town.


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