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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 12-31-2010, 11:00 PM
Dirtymechanic Dirtymechanic is offline
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Codes p0304 and p0316 help please!

Can I get some help please? I am currently pulling a trailer through Joshua tree and I am stuck at the moment. Getting codes 304 and 316 on the truck. F150 2004 5.4 4x4. Replaced the coils and crankkshaft shaft sensor already today still no go. Any ideas on what to do next?
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Old 01-01-2011, 08:40 AM
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Are you still getting the same codes?
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Old 01-01-2011, 09:45 AM
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Try a set of plugs.
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Old 01-01-2011, 12:42 PM
Dirtymechanic Dirtymechanic is offline
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I changed plugs over summer, even moved plugs around, as well as coils, codes I do get are p0304, p0305, p0308, p0316, even got p0174, this thing is a mess. Clean out battery, cleaned out mass air flow and intake body, waiting for compression tester, looking at fuel injectors now
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Old 01-01-2011, 02:35 PM
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Still stuck

Still getting the same codes. Removed and cleaned injectors and a mess of sensors. Still the same codes. Truck runs ok by itself to get home but under a load with the trailer, no good. Could this be a compression problem?
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Old 01-01-2011, 04:21 PM
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No. The codes show a misfire in #4, 5, and 8 cylinders. P0316 is a misfire detected on startup and P0174 is system too lean bank #2. Given the age of the truck, I'd check out the fuel system. It could be that the fuel pump or driver module are starting to give out or injectors that are going bad.
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Old 01-01-2011, 05:54 PM
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Quote:
Originally Posted by Greg B View Post
No. The codes show a misfire in #4, 5, and 8 cylinders. P0316 is a misfire detected on startup and P0174 is system too lean bank #2. Given the age of the truck, I'd check out the fuel system. It could be that the fuel pump or driver module are starting to give out or injectors that are going bad.
+1 Also the fuel filter...
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Old 01-01-2011, 09:28 PM
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3,5,& 8 could have low compression which would cause those codes, you need 3 things to work air, fuel, and fire
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Old 01-01-2011, 09:28 PM
 
 
 
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