OK, I know about the SEIC and all that stuff. But is it better on a diesel to be shut down, leave for 10 minutes, then start it back up? Or would you leave it running? With all of our Class 8 trucks, they are set up to run 15 min, then shut down. Also, why are you idleing your trucks with the SEIC? To keep your cab warm or cold, or to power lights and other electrical stuff?

Another question, can you leave your keys in the ignition with the truck running, lock the doors on the panel, then run into the store, then come back out and use your number pad? I know some cars will not lock if the keys are in the ignition.

Off Topic, but when LTL trucks come in for delivery (FedEx, UPS, Averitt), the instant they pull the parking brake, the trucks will shut down....... I know for sure with the number of stops they make a day, they must replace a lot of starters. All in the name of fuel i guess?

 

Yes you can lock the doors with the truck running, and use the pad.

 

do it all the time...

 

Ya guy's give your input here!!

I did the High Idle Upgrade and wounder is this how it should be when i idle for 10 minutes or longer

I Live in Michigan and it is cold snowing and blowing

I have to idle because i have many stops in my job and the truck gets cold fast if i shut it off the windsheild wipers freeze up
and all that good stuff.

This morning i drove to the local coffee shop and the trucks temp never moved so when i got there i set it to high idle for about 15 minutes
while inside it was 19 deg.

better to idle at 1200 RPM or 600? or not at all?

 

I wish we could get the official ford word on this issue. I would say it's better to high idle than normal idle. On the Mack MP engines they say to high idle anytime you are sitting for an extended period (15 min). The reason they give are fuel washing down the cylinders, and soot covering the valves and the egr.

 

Idling is simply not good for an engine. High idle is better than regular idle, but no idle is best.

Your engine is designed to work, not sit idling. An idling engine has a very tough time staying up to temperature, which can lead to lots of problems as stated above with cylinder washing and build-up.

A Ford diesel tech here on FTE told me the vast majority of problems he's seen with 6.4L and 6.0L trucks are units with high idle times.

If you must idle, high idle is best. If you don't need to, it's best for your engine to shut it off!

 

put a bra on it.

 

I agree with you..... High Idle if you must, but shut er' down if you can...


PUT A BRA ON IT? That goes against everything my father taught me.

 

LMAO my thoughts exactly when I saw that

 

this is one girl that will love you back way better if you dress her, than if you leave her naked. teehee. the other issue is that oil pressure is much lower at idle. the items at the end of the oil galleries will tend to get less than ideal quantities of lubricant. the oil just doesn't get spread around as effectively. example cylinder walls are lubed by the oil that comes out of the bottom rod bearings and is flung onto the cyl wall. at idle there is less of it, and it isn't flung as hard, less of it makes it there. so you get the double whammy more fuel washing and less oil to replace it.

 

This is an interesting topic. Makes me curious what the real definition of "idle" is. If "high idle" is an accurate term for a sustained 1200 RPM, then "idle" cannot be defined as a specific RPM, but must be a sustained one (at any level). If it's defined by the lack of load, then I struggle to understand the differences inside the engine when at 1200 rpm under load and not under load. I suppose there's more fuel being burned to keep the engine at that speed (given the increased resistance under load)... but at a particular RPM, the parts inside are all moving at the same speed loaded or otherwise. I can see how heat generation is different, but what else changes? In my mind, once an engine is up to temp it should be okay to idle... what am I missing?

 

TheDieselStop.Com - www.thedieselstop.com

Found this interesting. Sorry, its a rival forum. I dont know if that is against the rules or not......



Cut from Article:

2. DON'T let the engine idle for more than five (5) minutes at any one time during the first 100 miles. (Even in traffic.) Remember those loose fitting rings, and possible fuel-oil dilution that were noted above? (Fuel Dilution is very common when diesels idle, even with well broken-in engines.) Well, if that fuel is allowed to contact the main and rod bearings during break in (not really good at any time), you might be looking at an engine that will always consume some oil and one that may not produce power or mileage as expected. In the first few miles of break-in, the bearings are mating to the crank, rods, etc. It is imperative during this time that the lubrication qualities of the oil remain robust. Fuel in the oil will reduce its ability to absorb shock and float the rotating parts in their bearings. Contact between bearings and journals will occur more frequently which will result in additional friction wear. This will ultimately reduce the tight tolerances between the bearings and journals. What was originally a tight fit will be sloppy and will never be able to mate properly.



I think fuel dillution is your main threat..... When we send in oil for our trucks, the ones that idle for extened periods have the most dillution. Thus require a more frequent oil change. But even if you change the oil frequently, I think the soot on the valves and in the EGR chamber clog up fast too. Its like people who smoke, some of them live to be 105, where as others die at 55 because of it. If you need to idle, do it, if not don't. Your truck will proably crap out because of something else anyways.... Just my 2 Cents.

 

has anyone reported significant oil dilution on the new 6.7? I thought that the new manufacturing process and CGI block have all but made that a thing of the past

 

I believe those new manufacturing processes and CGI block help in a big way, but I don't think you'll ever get rid of fuel dilution in a diesel engine.

Diesel likes to stick to cylinder walls, especially when the engine is not up to temp. Idling causes the engine to cool down, making this situation worse. Even at a high idle the engine isn't operating as hot as it should be.

 

HHMMM, I have never owned a diesel before, so this is news to me ! I do alot of interstate driving, for eg On Monday I am driving my current F150 from St louis to Los Angeles, I need to be there Tuesday night. Frequently, on a trip like that, I will pull into a reststop and take a nap for half an hour or so. I usually Idle so I can have either the air conditioning going or the heater. So from what I understand here, is that when I step up to the diesel I am either gonna roast or freeze my butt off during my nap time !!
I can't be the only person who does this.