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  #1  
Old 11-28-2012, 05:31 AM
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P0284 code

So here's the deal, two days ago I got this code and the truck was running real rough while it was warming up. It has happened two or three times now only while warming up and once the code is cleared it doesn't come back for a while.

Here's the kicker this happened back in August and would only do it after it was warmed up but didn't go away. So I replaced the #8 injector at that time. Was working just fine until this started happening again when cold.

Ficm voltage running is 47.5-48.5 and battery voltage is 13.7-14.1 per my cts. I have to check while cranking again.

Any thoughts?


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Old 11-28-2012, 09:55 AM
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You might want to check this out

code p0284 cyl #8
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Old 11-28-2012, 10:54 AM
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Checking the wires and FICM cranking would be a good start. Was the injector a rebuild or a reman? Before pulling it, a buzz test followed by the contribution/balance test is in order.

Last edited by twoicebergs; 11-28-2012 at 10:55 AM. Reason: buzz
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Old 11-28-2012, 11:12 AM
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It was a replacement from ford so whatever they do to them I what it is. Thanks for the suggestions so far. I will read that article as soon as I get a chance.


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Old 11-28-2012, 11:32 AM
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Ford should have given you a factory (Alliant) reman. They would have done the tests I suggested before replacing it. It would be highly unlikely the injector would go again so soon without a contributing problem but, it is still possible; hence the re-tests.
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Old 11-28-2012, 01:22 PM
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Ok will do that too. I'm guessing I have to have AE software or ford do the tests? Thanks for the info. I'll test the ficm cranking voltage and check over the wires in the morning when it is cold.

Just a little more info in case someone is wondering. I just changed the oil 300 miles ago and fuel filters too at that time. Oil is changed every 5000 and fuel filters at 10000 with motor craft but tho did it twice before the change too.


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Old 11-28-2012, 01:32 PM
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What kind of injector, from where? Oh, you answered that sorry.

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Old 12-01-2012, 07:59 AM
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So I finally got to test it yesterday morning. Temp was about 48 degrees outside. KOEO was at 48.3 volts KOE cranking 47.9-48.1 volts and KOER was at 48.7 volts.

Fuel pressure is at 76-78 psi at idle and hasn't dropped below 62 psi full throttle. It does have Matt's srl tune on it right now.

So looks like I need to take it to get tested to see what's up.


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