Question about 2004 Ford F350

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F350 Smoking and missing

Have a 2004 f350 diesel loses power smokes and misses after warm up. I have changed fuel filters air filter and cleaned the EGR valve

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  • heriberto82 Jun 26, 2008

    have same problem exept my truck only has 30,000 miles change egr vale and still smokes and just today it stared knoking I put to quts of oil and knoking went away what can I try

  • Anonymous Jun 30, 2008

    i changed fuel filters i took down the gastank found it very clean i added mystery oil next tank i added sea foam i tried biofuel but it still smokes my truck is a 2004 ford 1 ton super duty diesel i would appreaceiate any help thank you R BELL

  • Anonymous Mar 26, 2014

    spark plug ejected itself and then started missing and smokes only until it warms up and surges and tries to die when at a stoplight

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Check all vacuum line and turbo

Posted on Mar 28, 2013

Have you checked the Injectors?

Posted on Jun 20, 2008

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1 Answer

My 2001 ford f350 diesel just started smoking out of the exhaust


Not bad Diesel or filter,injector more likely, your better off running a KOER test,(Key on engine running test) and do a buzz test on the injector,

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Smoking white smoke at idal and lots of black at 1500 and above . a little miss at 1500rpms no power lose


Black smoke is a sign of an overly rich fuel/air mixture. White smoke is a sign of coolant entering the combustion chamber. Most likely you have a blown head gasket. Other symptoms are loss of coolant with no apparent leak, loss of power, miss, oil level overfull, a white foamy substance on the underside of the oil fill cap. Stop driving this truck until you find the problem. Driving it with a blown head gasket will destroy the engine. A compression test will verify this.

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My 04 F250 diesel truck is loosing power every time I accelarate or go uphill and sometimes lets out a substantial amount of blue smoke from the exhaust. I changed the EGR Valve, and it improved for one...


Check the air filter and check the fuel filter. Most diesels lose power from a dirty air filter and moisture or dirt in the fuel filter. When you remove the fuel filter pour the fuel in a glass jar and let it sit awhile if you see two different fluids in the jar you have water at the bottom and fuel on top and need to replace the fuel filter. I think the EGR valve may have been a coincidence. let me know .

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i had this problem and thought the fuel filter oil filter needed replacing so i have just had a service done but problem is still there but not as bad. been told it could be the AGR valve or a split pipe going to it which recuirculates unused fuel back to burn again. therefore unspent fuel is coming out of the exhaust causing the black smoke. i am still looking for the answer aswell, hope this helps.

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Where and how to change fuel filter on 1996 Ford F350 7.3 turbo disel truck? Is there more than one fuel filter?


Please don't forget to rate!!!!

Diesel Engines The 6.9L and 7.3L diesel engines use a one-piece spin-on fuel filter. Do not add fuel to the new fuel filter. Allow the engine to draw fuel through the filter.
  1. Remove the spin-on filter by unscrewing it counterclockwise with your hands or a strap wrench.
  2. Clean the filter mounting surface.
  3. Coat the gasket or the replacement filter with clean diesel fuel. This helps ensure a good seal.
  4. Tighten the filter by hand until the gasket touches the filter mounting surface.
  5. Tighten the filter an additional 1⁄2 turn. NOTE: After changing the fuel filter, the engine will purge the trapped air as it runs. The engine may run roughly and smoke excessively until the air is cleared from the system.

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1 Answer

2004 Ford F350 diesel, changed fuel filters hard starting


Pull the filters and ck for plastic or o-ring in wrong place. Something is up in the filter. 

Jul 28, 2009 | 2004 Ford F350

1 Answer

Valve on diesel fuel filter how does it work what does it do


hi have you checked the air filter is it dirty , drain the fuel filter , sounds like the timing is out , the fuel pump timing could be one tooth out , all above is a cheap check before starting any where else .

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Blue smoke is oil, probably a sign of worn rings, has it done quite high mileage?

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Is the check engine light on? Any more specific info like year, make, model, what color the smoke is, how many miles, etc........ This could help to narrow down the problem other than the smoke which all diesels do with quick acceleration. You might get a quicker answer if you are more detailed!

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