Why does she shudder on startup?
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More Turbo
Joined: Feb 2011
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Why does she shudder on startup?
The past month or two, my garage-kept 2011 F350 6.7 with 38K miles will shudder on startup for a second or two or three then runs normal. Any ideas what would be causing that? She is my every day driver, but I don't drive her every day. Seems that the longer she sits, the rougher the startup. Last time I drove her was Monday. Started her up tonight to run to the store and she shuddered for about three seconds.
Thanks.
Thanks.
Posting Guru
Joined: Nov 2010
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From: Eagle Mountian, Utah
I think its just casue its cold. Mine does it too for like 3 seconds on start up. Evens out real fast, exhaust has some heavy white diesel smelling smoke for a few minutes (dpf fell off <img src="images/smilies/happy0161.gif" border="0" alt="" title="Smilie" smilieid="1" class="inlineimg" /> ). Only happens when its cold. Otherwise I rarely smell or see anything.
Post Fiend
Joined: Jan 2009
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From: Greenwood, SC
Hmm, as far as I know the only way a diesel will run rough is if there isn't any fuel in a cylinder for one of the compression strokes, right?
So, what would cause no fuel to fire into the cylinder? And, how could this happen with no check engine light on these highly computerized engines? A glow plug controller issue or an injector issue would send alarms immediately, right?
Maybe your batts are weak?
So, what would cause no fuel to fire into the cylinder? And, how could this happen with no check engine light on these highly computerized engines? A glow plug controller issue or an injector issue would send alarms immediately, right?
Maybe your batts are weak?
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
This sounds like a fuel pressure issue to me. Like or almost what would happen with some air in the system.
Maybe a glow plug issue. I would think though if it were a glow plug then you would have the light come on.
Maybe a glow plug issue. I would think though if it were a glow plug then you would have the light come on.
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From: Frederick, MD
Perhaps load test the batteries independently. I don't think that is the issue but it certainly should be ruled out.
What about plugging the truck in if you have the block heater and see how it starts then?
What about plugging the truck in if you have the block heater and see how it starts then?
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Fleet Mechanic
Joined: Nov 2005
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From: Upstate NY
Mine tends to run pretty rough when the temp in the garage dips into the 20s and the Gauge Mode on the dash tells me that the engine and transmission oil temps are below 32F. It goes away by the time I've backed out and let it idle until those temps get into the 40s. Oh and if I don't use a fuel additive, it's worse (I forgot for a couple tanks worth
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Super Moderator
Joined: Aug 2008
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From: Frederick, MD
I have had my oil temps down to the single digits and it starts and runs smooth right way.
In my 08 6.4 it would chug for a few minutes till it got a little heat.
Completely different glow plugs and such so not a real comparison.
Both unplugged starting events.
In my 08 6.4 it would chug for a few minutes till it got a little heat.
Completely different glow plugs and such so not a real comparison.
Both unplugged starting events.
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More Turbo
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I've never used one. Recommendations? I'm heading up to AutoZone at lunch to get the battery tested and I'll get that purchased and added.
Fleet Mechanic
Joined: Nov 2005
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From: Upstate NY
This time of year the winter blend Power System stuff in the white jug. It's a few bucks cheaper at WalMart then Auto Zone/Advance. There are other products that are as good but this product is available almost everywhere including most truck stops too. I like it for the little bit of added lubricity as well as the anti gel properties and in upstate NY, diesel can and will gel - as I found out again with my little ISEKI tractor even though it has the exact same fuel as the truck. Use ~an ounce per every 3 gallons of fuel.
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Both batteries test good. Truck didn't shudder when I started her to go. AutoZone had Diesel Kleen in a gray bottle, and a white bottle of antigel. Kid didn't know much about either. What exactly are you guys talking about? One of them? I'm thinking I just need to clean things up a bit.
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Does the white have the cleaner in it too, or is it just anti-gel? I'm making the Florida run soon... 1000 miles each way with a fifth wheel attached... How much Kleen for a 26 gallon tank? And still recommend white even though I'm heading south?