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5.4 random Missfire

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Old Feb 16, 2008 | 08:37 PM
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5.4 random Missfire

In my 1999 f250 superduty 5.4 it is missing and i dont know what it is, i checked the injectors, coils and spark plugs, could it be a camshaft position sensor or a crankshaft position sensor?
 
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Old Feb 16, 2008 | 10:32 PM
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my 2000 f-250 5.4 started random misses 2 days ago, im starting with new plugs and spark boots.
 
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Old Feb 16, 2008 | 10:55 PM
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From: S CAL
Originally Posted by 99_F250_SD
In my 1999 f250 superduty 5.4 it is missing and i dont know what it is, i checked the injectors, coils and spark plugs, could it be a camshaft position sensor or a crankshaft position sensor?
Do you have an engine check light? If you do, get the DTC and then it could tell you which cylinder is mis-firing. The camshaft position and crankshaft position sensors are for timing purposes and firing order. I do not think it would be one of those.
 

Last edited by 3000 FPS; Feb 16, 2008 at 11:26 PM. Reason: typo
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Old Feb 16, 2008 | 11:06 PM
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mine has done it 3 times now, and no lights.
 
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Old Feb 16, 2008 | 11:20 PM
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From: S CAL
Originally Posted by mrkevin
mine has done it 3 times now, and no lights.
One of the trouble shooting tactics that some of the guys do is to buy one coil and then rotate it through all the cylinders until you find the bad one. The coils do not always throw a code when mis-firing. I would put a code reader on it anyways just to see if there are any stored in it and not causing a dash light.
I believe autozone or some of the other places will scan it for free.
 

Last edited by 3000 FPS; Feb 16, 2008 at 11:27 PM.
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Old Feb 17, 2008 | 12:27 AM
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well i scanned it with my programmer and it gave me a code P0300 and that was it.
 
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Old Feb 17, 2008 | 07:55 AM
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Thou shalt scan thou engine
And thy scanner shall have abilities to read Pending codes
And those pending codes will showeth thou problerm
And thou will fix thy problem.
 
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