Idling

[73shark]

IIRC, the regen cycles are determined by the ECM and prolonged idling, which generates excessive particles, doesn't allow frequent enough regen cycles.

Pretty sure the "High Idle" option is still available since one of the main users of it is ambulances and police vehicles.

[Protagonist]

Originally Posted by 73shark

Pretty sure the "High Idle" option is still available since one of the main users of it is ambulances and police vehicles.

But that's not guarantee that it's available on the Sprinters bought by Airstream. My 2012 Airstream/2011 Sprinter doesn't have it, as far as I know. If the van does have it I've never managed to activate it.

[73shark]

Originally Posted by Protagonist

But that's not guarantee that it's available on the Sprinters bought by Airstream. My 2012 Airstream/2011 Sprinter doesn't have it, as far as I know. If the van does have it I've never managed to activate it.

Didn't mean to imply that it was on the AIs, just that it was still a Sprinter option.

Might be nice to have tho to supplement that measly one ton rear A/C unit when parked.

[lewster]

My 2011 doesn't have the 'particle killer' filter! Just the EGR valve that must watched. I drive a lot of highway miles and not so much stop & go, but still had to replace the EGR at 100K. No difference noticed after long hot drives either.

[Mr. B]

So, got it )
And? the best decision to safe the engine on idling is to install the idling rpm increaser? How it is called, PSM parametric special modul, or somehow else?

[Bob4x4]

The hi idle feature is there to prevent cylinder wash down due to low cylinder temps.It will not make much difference to the egr valve.The dpf will see soot load increase during prolonged idling.The Rams have software that attempts to deal with this-not sure if Mb does or not

[Isuzusweet]

All great posts so far but do remember that a limited cooling off idle at the end of a high speed run is perfectly acceptable; one to two minutes will slowdown and cool off the turbo. Also starting and idling for at least a minute before hitting the highway and placing a load on the motor is always a good idea as well.

Excessive idling is not good for newer engines, especially with the new low sulfur diesel fuels.

A very good post of the difference between new and old diesel is in this thread. A must read for diesel guys.

http://www.thedieselgarage.com/forum...ur-diesel.html

Or get an extended oiling system that will continue to pump oil around your engine for a certain amount of time.

https://www.rbracing-rsr.com/oilsystems.htm

Cheers
Tony

[LB_3]

This might be an option:

http://www.midcityengineering.com/sp...ter-smart-idle

[Boxster1971]

Originally Posted by LB_3

This might be an option:

http://www.midcityengineering.com/sp...ter-smart-idle

Thanks for posting this info. That is just like the Mercedes adjustable fast idle option. I wonder what it costs compared to having the factory option installed. The factory option includes a switch to engage and can be adjusted by the cruise control lever.

- - Mike

[Mr. B]

... I just didn't understand from their website where to buy it and how to connect...

[lewster]

Click on the 'Find a Dealer' tab and see if anyone in your area sells their stuff.

[slowmover]

High idle has to do with oil pressure.

Increasing the size of the hydrodynamic oil wedge at the main bearings.

It won't reduce DPF coking.

Modern diesels are better at controlling oil and water temps at idle, but no manufacturer recommends prolonged idling.

A Diesel engine, with or without emissions gear, needs to be run regularly at 60% load or greater to reduce combustion byproducts which reduce performance.

[J. Morgan]

A DPF is going to plug no matter what.

Those things were a bad idea and they are dangerous.

Before DPF's diesel trucks catching fire after accidents was kind of infrequent, now, not so much.

Like DEF, a huge PITA for little gain.


Superat stultitia.

[HowieE]

If you have a real oil pressure gauge, not the factory type, you will see why prolonged idling is harmful. It is not uncommon for oil pressure to drop below 10 lbs at idle. That pressure will not fully support the main bearings.

[slowmover]

"High idle" brings oil pressure to approximately the point one sees on the highway after warm up.

However, it's pretty much too high an rpm at which to put an engine into gear.

Depending on spec, high idle may also raise alternator rpm enough to generate greater amperage. But this is more a commercial or police/EMT thing in years past.

I'd rather have it than not (even though my engine is pre emissions spec), but one uses prolonged idle at a cost.

In assessing a used vehicle, the average mph derived from engine hours versus total miles is an accurate indicator of health. I wouldn't ever buy a used diesel pickup where average mph was below 27, for example.

"High idle" is a useful option, but use should be sparing. It puts an engine into "severe service" category pretty quickly.

Diesel engines have very high compression ratios. Tremendous cylinder heat in normal operation. That's the norm.

[Mr. B]

Great info.
And what is a good average total mph on the dashboard that you will buy the used diesel vehicle?

[slowmover]

An average above 27. I bought one where the average was 47. I don't think the original owner stopped except for diesel and cigarettes. A west Texas company truck pulling a light service trailer.

Took it to a Dodge dealer for a checkover where I had connections. Two men there wanted to buy it if I didn't. Has worked out well.

[Boxster1971]

Originally Posted by slowmover

An average above 27. I bought one where the average was 47. I don't think the original owner stopped except for diesel and cigarettes. A west Texas company truck pulling a light service trailer.

Took it to a Dodge dealer for a checkover where I had connections. Two men there wanted to buy it if I didn't. Has worked out well.

I'm missing something. How are determining the average MPH?


- - Mike
2013 Lounge EXT on 2012 Sprinter

[J. Morgan]

The computer in modern vehicles will track and record average speed.

A better code reader will display this information.


Superat stultitia.

[Mr. B]

Any Benz today have it on the steering wheel buttons: in 'trip details' mode - fuel per gallon and mph from a morning start, and from the last reset.