6.0 missing around 55-60 mph - Ford Powerstroke Diesel Forum
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Old 01-04-2013, 05:29 PM
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6.0 missing around 55-60 mph

I'm looking at buying a 2003 F-250 with the 6.0. It runs great, shifts firm, etc, but when you get around 55-60 mph and have it under a steady pull, it starts jerking like its missing. I talked to the previous owner and he said that it had been doing it for around 6 months but the local mechanic couldn't find anything wrong. Does anyone have any ideas on what might be wrong? Any help would be appreciated.


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Old 01-04-2013, 05:29 PM
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I just went through this. It's a bad injector or 2 or 3. Light cruise is fine,WOT is fine but light load cruising misses like crazy. Make sure you FICM voltage and HPOP is ok but it sounds exactly the same as what mine was doing.
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Old 01-04-2013, 05:50 PM
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Mine did same thing no codes, no smoke, and buzz test was fine. About a month latter started to get cylinder contribution codes on 2 injectors. Replaced injectors and switched to Rotella T6 synthetic and no more problems. Mine does not like conventional oil at all. You might get problem to clear with RevX or HSS but it will come back if its an injector problem. Hope this helps
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Old 01-04-2013, 09:12 PM
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Spool valves in injectors are going bad or have failed.
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Old 01-04-2013, 11:44 PM
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Thanks guys. The price is right on this truck and I'll probably buy it tomorrow (well today technically). I'm thinking I can get it for $9000-9500. It's a 2003 lariat f-250 4x4. I have a 99 7.3 which is my pride and joy, but I'm buying this one to use for pulling a gooseneck and overall farm work. 6.0 missing around 55-60 mph-imageuploadedbyautoguide1357375455.756445.jpg


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Old 01-04-2013, 11:47 PM
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Sounds like a good deal. If your handy with a wrench pull those injectors out and send them to Jesse Warren of Warren Diesel and have him rebuild them to stocks again and you'll be good as new for WAY cheaper than buying new injectors and having them done at a shop.
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Old 01-04-2013, 11:49 PM
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BTW, my 7.3 is turned up all that I can on a stock fuel system and has a bigger turbo and it would absolutely spank this stock 6.0. the 7.3 is my "going out truck"6.0 missing around 55-60 mph-imageuploadedbyautoguide1357375755.227062.jpg


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Old 01-04-2013, 11:51 PM
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Thanks Tuscany, I'll definitely look into it.


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Old 01-04-2013, 11:51 PM
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That 7.3 is in for a rude awakening when the 6.0 gets a custom tune.
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Old 01-04-2013, 11:52 PM
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No problem. If your looking to keep it stockish for work purposes I think he does rebuilds to stock specs on all 8 injectors for $500. Whereas buying new or remanned injectors are around $260+ each.
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