Leave it running or shut it off? - Ford Powerstroke Diesel Forum
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Old 12-02-2008, 12:40 PM
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Leave it running or shut it off?

I've always noticed how some people with diesels will leave their truck running rather than cutting it off if they are going to be parked for a while. They claim that it takes more fuel to start it up than it does to leave it running for a little while. I am just curious if this is true.

Whats the theory behind this?
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Old 12-02-2008, 12:42 PM
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On a big rig it is true. On our trucks really doesn't matter. As a warm engine starts relatively easy. Where a cold engine starts hard and will use more fuel to start.
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Old 12-02-2008, 12:46 PM
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Gotta be careful with your idle time though if you still have your EGR...it will contribute to clogging it up.
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Old 12-02-2008, 12:47 PM
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Quote:
Originally Posted by fordpwrstroke7 View Post
Gotta be careful with your idle time though if you still have your EGR...it will contribute to clogging it up.
Took the words out of my mouth
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Old 12-02-2008, 12:59 PM
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You don't want to turn off your truck after a hard run because it will roast the oil trapped in the turbo bearings. The result of doing this will build up carbon and will quickly kill the bearings.
I see allot of people with turbo timers but this too will waste fuel if you dont pick the right amount of shutdown time.
I use a turbo temp monitor that will only keep the truck running long enough to reach your set point and then it will shut off. I have noticed in my truck that I will reach my shutdown temp setting just cruising in town for a city block or two at 25 or 30 MPH.
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Old 12-02-2008, 01:19 PM
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yep no need for a turbo timer when u have a perfectly good egt gauge to look at!
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Old 12-02-2008, 02:17 PM
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I can tell you that ideling a 6.0 will bring lots of headaches, unless you take care of the EGR. After the EGR block off plate, I can leave the rig running for days on end with no problem. Without the block off plate, I wouldn't push it much past 15 minutes.
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Old 12-02-2008, 07:14 PM
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I can tell you first hand it uses WAY more fuel to leave it idling. I do refrigeration service. When I first got my truck I let it idle all the time during the summer when I was doing service calls. I have to get in and out of my truck often to get supplies, write things up, make phone calls, etc. I kept it running so it would always be cool. After a couple weeks of 11 MPG averages, I stopped letting it idle and went up to over 16 MPG.
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Old 12-02-2008, 07:18 PM
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Kind of a dumb question but does a 7.3 have an EGR?
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Old 12-02-2008, 07:18 PM
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I let mine idle all the time at jobsites, in the winter. I just hate having a cold truck, and I useally have lights going... plus it has the im important effect lol, and if im running into a store for a drink, i leave it on. no sense in turning it off for 5 minutes, and making the glowplugs and batterys wear out faster.
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