P0305/P0316 Codes

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Nov 27, 2012 | 04:13 PM

#1

elemakule

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P0305/P0316 Codes

On a 2005 Ranger 4.0 V6, 305 & 316 codes indicating cylinder 5 misfire in first 1000 revs. This occurs, obviously, at start up consistently. The truck idles rough but seems to run fine. Spark plugs were replaced. Swapped plug wires between cylinders 4 & 5; code stayed with cylinder 5. Replaced the coil pack; no joy.

Any suggestions? It would be nice to be able to diagnose without spending too much money. The coil pack was $75 for nothing.

Thanks.

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Oct 1, 2013 | 08:50 AM

#2

dwbaily

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Quote:

Originally Posted by elemakule

On a 2005 Ranger 4.0 V6, 305 & 316 codes indicating cylinder 5 misfire in first 1000 revs. This occurs, obviously, at start up consistently. The truck idles rough but seems to run fine. Spark plugs were replaced. Swapped plug wires between cylinders 4 & 5; code stayed with cylinder 5. Replaced the coil pack; no joy.

Any suggestions? It would be nice to be able to diagnose without spending too much money. The coil pack was $75 for nothing.

Thanks.

I know it's been awhile since your post but did you ever get issue figured out? I have same problem with my 03 Explorer Sporttrac 4.0. Changed o2 sensor and that fixed it for around 1000 miles but now same 2 codes reared their ugly heads again this morning.

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Oct 1, 2013 | 11:26 AM

#3

elemakule

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P0305/P0316 Codes

It turned out to be a bad injector. Replaced the one injector for the reporting cylinder and all is well.

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Oct 1, 2013 | 12:24 PM

#4

dwbaily

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Quote:

Originally Posted by elemakule

It turned out to be a bad injector. Replaced the one injector for the reporting cylinder and all is well.

Glad you got yours fixed. Maybe they messed one of mine up when they flipped them from the old engine to the new long block. Hmmm.......

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