Help me understand why big honkin diesel pickup drvrs leave the engine running while sitting in a parking lot?

just smoking a cigarette. They are polluting not only the air but offending my hearing with that put-put of the diesel engine.
I try to not get really nasty, like a P.E.T.A. person in a fur coat fashion show, but I have a right to quiet, and fume-less air.
So @ 2.99 a gallon for diesel it's cheaper???? And this is TX, it hasn't gotten cooler yet.
Do you have to leave the keys in the ignition, is it easy to steal a running vehicle?????
just wonderin'.

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14 Responses to Help me understand why big honkin diesel pickup drvrs leave the engine running while sitting in a parking lot?

  1. DaveBurke_98 June 9, 2009 at 5:34 am #

    cheaper to let it run than to restart it.

  2. thetravelinggardener June 9, 2009 at 5:34 am #

    if you got it–flaunt it

  3. Care Bear June 9, 2009 at 5:34 am #

    Depending on the weather, the dissel will congeal when it cools and then they will have to wait till the diessle cools completly before starting again. If I remeber right. Something like that.

  4. JohnRingold June 9, 2009 at 5:34 am #

    Diesel engines are designed to run at idle speed better than gasoline engines. Also it is harder on a diesel engine during start up hence it is cheaper for the owner to leave the vehicle idling than it is to turn off and start back up a couple of minutes later.

  5. bowhunter6778 June 9, 2009 at 5:34 am #

    i leave mine running all day long when i run into stores and such the only thing i can tell you is that you have to deal with it and park sumwhere else or shut up about it. my truck is used for work and play and has a 6 inch exhuast. all i can say is it is loud and pulls the hell out of a trailer but have not had anybody complain to me in the neighbor hood thats it too loud

  6. dodge man June 9, 2009 at 5:34 am #

    i own a repair shop,and i do diesel work,and its just as cheap to leave it running than it ts to re-start it, i have left them running here at the shop,for hours at a time just to see if they was going to be alright,but this is the main reason for leaving them running,this and also in the winter it keep the cab area warm for the driver,good luck i hope this help,s.

  7. Pops June 9, 2009 at 5:34 am #

    Diesels aren't like gasoline engines. They have a turbo charger that runs off HOT exhaust gases. Exhaust gases are VERY hot which causes the turbo to get VERY hot. If a driver, after a hard run, pulls into a parking spot and shuts the engine down, the turbo charger will also stop, cool down slowly allowing the center shaft to sag. If this happens, the driver just bought himself a new VERY costly turbo charger. The cool down period usually takes around 10-15 minutes. This is why you may see him/her sitting in the cab smoking a cigarette.

    The driver may just taking a quick break and the AC sure feels good when it is 100 degrees out and the engine is putting out heat also. Don't be so hard on them. Truck driving is a lonely, hard but rewarding job. Pops

  8. gibbyguys June 9, 2009 at 5:34 am #

    They are left running because it is more efficient to do so than to re-start it every time they want to leave.Diesel engines have a glo plug that takes some time to warm up,before you can start them,so it is much easier to just leave them running.

  9. melissalynn_81 June 9, 2009 at 5:34 am #

    Actually, I drive a diesel, so I can offer some insight for you…. It actually uses and burns more gas to stop and restart the engine than it does to leave it running, and if the truck is in good shape, it burns and emmitts the least amount of fumes when it's sitting in idle. Also, and this is true for any vehicle, it adds much more wear and tear to the enging with constant stopping and re-starting….. Hope this helps!!!!

  10. Joe June 9, 2009 at 5:34 am #

    a diesel truck engine needs the high compression ratio to make it run properly, around 20.1:1, where a conventiontial gas engine is around 8.5:1.Both engines use the expansion of the exhaust gases to seal therings to cylinder wall. In other words, the expanding gases push down on the top and th back of the rings making a proper seal. Constantly starting and stopping an engine makes the rings stick in the pistons leading to premaure engine failure.

  11. freddyneuwendyke June 9, 2009 at 5:34 am #

    Because odd as it may sound it's actually more fuel efficient to leave the motor running than to shut it off and start it back up. Plus on many pieces of equipment they have to be started constantly due to the batteries used on them. German tanks during WW2 had to be turned over and run every 4 hours.

  12. sterling m June 9, 2009 at 5:34 am #

    a diesel is a compression ignition engine and is way more efficient at temperature than when cold , also the turbos wear faster in start stop situations

  13. moe h June 9, 2009 at 5:34 am #

    The new diesel fuel wont make it a good idea to run all the time,The new fuel lacks lubrication, most manufacturers no longer advise long idle times as fuel dilution into the crankcase ruins the lubrication of the oil.I work on detriot diesels alot and the main problem is oil dilution on bearing wear.we get some bearing wear results on our oil lab numbers.

  14. luther June 9, 2009 at 5:34 am #

    I have thought about this also. Here is just a guess. A large diesel engine holds a very large quantity of oil in the crankcase. Whenever you stop the engine it begins to cool and moisture in the air inside the engine condenses. The moisture mixes with burned diesel by products and creates a mild acid that pollutes the oil leading to needing a premature oil change. That can be very expensive.