6.0L cold start

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Nov 21, 2009 | 07:41 PM

steve5

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Joined: Sep 2009

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6.0L cold start

I have a 2003 6 liter with 90,000 mi . When its been sitting overnite, it starts with a rough idle for 5 seconds then smooths out and is fine the rest of the day.

Glow plug problem?

Nov 21, 2009 | 07:53 PM

sandmanf250

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Joined: Mar 2003

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my 03 did the same but a ford tech friend of mine did the latest flash for free and she purrs like a kitten

Nov 21, 2009 | 08:03 PM

krisbmeyer

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Joined: Nov 2009

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From: Killeen TX

What type of oil do you use?

I'm from Texas but working in Colorado right now. I've experienced the same problem and thanks to posts I've read in here I switched from the Motorcraft 15W-40 standard oil to Mobil 1 Synthetic 5W-40 Turbo Diesel Formula. It smoothed right out. and idles better and just overall runs better with the sythetic. Hope this helps.....

Nov 21, 2009 | 08:52 PM

lariat97

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Joined: Jun 2005

Posts: 7,047

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From: North west La

My 04 does the same thing with dino oil. I switched to synthetic oil & my truck runs much better.

Nov 21, 2009 | 08:58 PM

krisbmeyer

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Joined: Nov 2009

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From: Killeen TX

The Mobil 1 will run you at around $7 a quart and you can buy Royal Purple for around $8 a quart at your local parts store. I've been buying mine at Pep Boys. They carry both. So for a filter and oil plus tax will run you around $125 to $130. Not sure where I'll buy it once I get back to Central Texas

Guess I'll turn to the internet....