6.7L Cummins Forum

Vis-a'-vis · #11 (**permalink**) 08-04-2008, 07:17 AM

Here's what the owners manual says about that;
Engine Idling — In Cold Weather
Avoid prolonged idling in ambient temperatures below
0°F. Long periods of idling may be harmful to your
engine because combustion chamber temperatures can
drop so low that the fuel may not burn completely.
Incomplete combustion allows carbon and varnish to
form on piston rings and injector nozzles. Also, the
unburned fuel can enter the crankcase, diluting the oil
and causing rapid wear to the engine.
NOTE: An optional driver-controlled high idle speed is
available on automatic transmission equipped vehicles
with speed control. This feature allows the driver to
select an elevated idle speed between 1100 and 1500
rpms. Your dealer can enable this feature.

If you idle for over 2 minutes, it's been my experience that you will begin to load up the diesel particulate filter. Higher idle speeds allow your truck to operate at a more "normal" level. Less soot, higher temps and less loading of the DPF. Still, I would not recommend long idle times as I believe the regen function does not operate in park.
You are in the world of the Blue Tech Diesel...We as owners are leading the way.

Squid · #12 (**permalink**) 08-04-2008, 08:22 AM

According to TSB 18-013-08 if you've had all the Flashes (X) and the G30 recall done the following should take place.

The latest ECM software includes a new extended idle feature to accommodate the
extended idle times present in some duty cycles. This feature may help to reduce the
accumulation of soot in the exhaust aftertreatment system when the engine is idling for
an extended period of time. Briefly how this feature works:
a. As needed, the engine enters an idling mode which dramatically reduces the rate of
soot accumulation in the diesel particulate filter (called “Net Zero”). Further, under
extended idle periods of longer than 2 hours, the engine enters a mode which
reduces the amount of soot accumulated in the diesel particulate filter (called “Net
Reduction”). While in these modes, the idle speed increases to 900 rpm for a period
of time. The idle speed may return to normal idle speed and then return to 900 rpm
to repeat this cycle during very long idle periods.
b. These modes occur automatically provided two conditions are met. The vehicle
must be in Park (automatic transmission) or have the Parking Brake engaged
(manual transmission) for these modes to be enabled. There must also be no
accelerator pedal input.
c. After extended idling, if operation of the engine consists of light loads for short
periods of time the engine will return more quickly to the Net Zero or the Net
Reduction mode of the extended idle operation feature.
d. After extended idling, if operating the engine consists of higher loads for longer
periods of time the engine must again idle for an extended period before the engine
will return to the Net Zero or the Net Reduction mode of the extended idle operation

feature.

http://www.cumminsownerz.com/attachm...-18-013-08.pdf

So who wants to idle for 2 hours and report back to us?

cumminonya · #13 (**permalink**) 06-15-2010, 06:33 PM

for a programmer you want H&S. ive never heard of anyone having a problem with them. Edge takes a min to start your truck so it gets rid of DTC's, H&S doesnt. Smarty is good, but ive heard it has been known to put the truck in limp mode. you want a egr delete, S&B intake and 5" pro flo straight pipe. get rid of the DPF. 22mpg with this on 120 tune.

Punisher 67 · #14 (**permalink**) 08-19-2010, 12:33 AM

I would put the smarty in about the same ball park as the H&S tuners , I am fully deleted so I wouldn't have the same headaches you guys would . I have to say I absolutely love the 6.7 especialy towing , what an animal

Ok I will step of the soap box...............

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