2006 Ford F150 P0300

Chris Diagnostician Bryans Road, Maryland Posted   Latest  
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2006 Ford F-150 FX4 5.4L (5) 4-spd (4R75E) — 1FTPX04526KB40287
P0300 — Random/Multiple Cylinder Misfire Detected
P0316 — Engine Misfire Detected on Startup (First 1000 Revolutions),

Good morning everyone I am looking for some help on this F150. This truck came in with a check engine light and customer stated no running issues. A scan showed a p0300 and p0316. I test drove the truck about 12 miles and never felt a actual misfire. When I check mode 6 it showed anywhere from 30-50 misfires on just about every cylinder none of them were much higher than the others. My issue that I am trying to figure out is while driving down the road the misfire counter will count misfires on about 5 or 6 cylinders with no misfire ever felt truck runs great with great power. I am assuming this is what eventually sets the p0300 as I have never had it act up. This is a new customer so I have been trying to get a much info as I can but I don't know how true it is. This truck has a new reman engine in it not sure how many miles ago it was put in but looks brand new. I found out last night that supposedly this is why the engine was put in because of misfire codes is all he was able to give me. So I started with a scope capture of the crank and cams since I knew the crank sensor is what would possible register the "misfires". If anyone has any ideas I would greatly appreciate it.

Thanks

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Michael Mobile Technician
Clinton, Utah
Michael Default
   

HI Chris, My experience with the P0316 is that there is either coolant or fuel leaking into the cylinders causing the engine to misfire on startup. It may also be leakdown of the fuel into tank after the ignition is turned off. Check fuel regulator for leaks at vacuum line if it has one. You could also check for PCM updates as there may be an inherent problem with a cold start that is addressed…

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Thanks for the reply Michael. I will look into those thing and see if I come up with anything. There is a TSB 5-25-5 for a p0300 with spark knock. When they changed the engine they put in new motorcraft plugs so I can look into seeing if it needs a reflash.

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Nguyễn Diagnostician
Hồ Chí Minh, Viet Nam
Nguyễn Default
 

Thanks.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

"My experience with the P0316 is that there....." Out here it just means they waited two months, after the coil died, to bother coming to a shop, Mike. :-)

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Benjamin Diagnostician
Murfreesboro, Tennessee
Benjamin Default
 

I would suggest pulling a spark plug and seeing what brand is in there. There are many aftermarket plug designs for these 3V 5.4s and they just don’t work as well as the recommended PZT-2F motorcraft plugs. If there is anything other than the specified motorcraft plugs, you would not be wrong with recommending replacement as a starting point. I would also make sure the PCM is up to date with the…

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

I pulled a plug and it was a PZK14F on the side of the plug which I checked with aftermarket and that is what they listed. I called ford and they said it is a SP-546. I ordered a plug from a aftermarket store and the plug box has the part number the dealer gave me on it also so I would assume it is the same plug. But I will look into the latest calibration.

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Jim Owner/Technician
Charlotte, North Carolina
Jim Default
 

Chris, also check the routing of the CKP sensor wires, I have seen aftermarket add ons, or wires routed too close to alt. causing issues. Are the coil packs OE Motorcraft? Maybe check alternator for ac ripple,

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Thanks for the reply I will look into the routing of the harness. All of the coils look to be OE not sure how many miles they have on them as the truck does have 270k on it. I will look into the alternator as well it had crossed my mind I just never did it. It does appear that it has been recently replaced.

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David Diagnostician
Candler, North Carolina
David Default
   

Chris, since the engine runs fine, it seems like a probable PCM logic fault.

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Robert Business Development Manager
Brookfield, WI, Wisconsin
Robert Default
 

2 weird Ford misfire codes I've seen lately: first from the harmonic balancer being wobbly - felt like a vibration, PCM registered misfires. Second was resetting KAM. Somehow, PCM got confused. Also, test drive warmed up, at 45-50, up a long incline, TCC engaged, high gear, medium throttle. If there is some "bucking", this is ignition misfire (usually coils).

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Thanks Robert for the info!

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Allan Owner
Sterling, Virginia
Allan Default
 

I’ve reprogrammed a lot from that era with the P0300 and P0316. If you don’t actually feel a miss a flash usually fixes it

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Chris Diagnostician
Bryans Road, Maryland
Chris Update
   

Thanks everyone for the info it let me be a little opened minded before jumped into reflashing the PCM which it still might need will have to check. I looked at the alternator harness and it was laying on the harness coming up from the crank sensor but this did not make a difference. Then Robert said something about a wobbly crank pulley so I looked at mine it did not wobble but for the heck of…

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Ray Diagnostician
North York, Ontario
Ray Default
 

Chris, this is a GIF of the known good cmp, ckp, for the guys who don't use the Pico If the engine continues to misfire on cold start, first connect the scope, set at 500 ms/div, to 4 COPs, then start the cold engine, so that you can try to capture some misfires. If you did not capture any misfires, you will have to connect the scope to the other 4 COPs, that were not scoped the first time…

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Just so we are clear, did it stop counting misfires now?

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Yes sorry I was not clear about that. Rpms raise off idle and driving down the road there were zero counted misfires now.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Thanks man. This actually makes a good study. One of those "you just cant trust electronics when a mechanical fault is present" tales.

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Gail Technician
Garner, North Carolina
Gail Default
 

This is an awesome example of how not being afraid to ask for help can save time. Great job by everyone involved. Except the engine installer. I would be sure to explain to the customer the damper being loose COULD have damaged the crank gear and/or the crankshaft. You won't know until a few thousand miles down the road. Would recommend the vehicle be returned in 500-1000 miles to re-check the…

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

They are lucky this isn't the smaller Ford engine that bends valves when the balancer is loose. (2.5?)

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Thanks for the post and some good ideas. I did recommend that the customer come back to recheck torque.

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Andrew Owner/Technician
Winter Park, Florida
Andrew Default
 

Hi Chris, That crank bolt is a one-time use fastener (possibly torque to yield). I see nothing in your post indicating that it was replaced (the post actually reads more like you just tightened the one on the vehicle.) If this is the case, I strongly recommend that you replace that bolt; otherwise it may come loose again (it may also have already been re-used by whoever was in there before you…

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Thanks for the info. I did just torque it down at the time to make sure that did fix my issue. When he stops back in to double check it I will replace the bolt. Thanks

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Samuel Technician
Somers Point, New Jersey
Samuel Default
 

WHAT A PHENOMENAL CASE STUDY!!! There are soooo many things that could cause this...everything that is listed and some!!!! Always think outside the box! ....do we know what caused the loose bolt.....Is this another known but kept quiet issue to be on the look out for?

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

I don’t know 100 percent but it just had a engine put in it about 2 months ago. Was it left loose from the install possibly but no way of knowing. It could also be due to the fact that maybe the bolt was reused but when I torqued the bolt it did press the crank pulley in about 1/4-1/2 inch. Now that I think about it the bolt did look relatively nice and new so maybe it was changed. Not sure…

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Samuel Technician
Somers Point, New Jersey
Samuel Default
 

Thank you for responding....I will be on the look out for this to see if it is something of a concern and I will DEFINITELY replace as needed in the future! Great post!

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Ken Owner/Technician
Phoenix, Arizona
Ken Default
 

The p0316 could be key here. Keep it over night and your scan tool should have a cylinder contribution graph.....have it misfire and watch the graph.....what amazes me about Ford is it takes 1000s of misfires to set a mil but just a few for a p0316 AND no cylinder named in the code

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Gail Technician
Garner, North Carolina
Gail Default
 

Ken---He found the problem. {Quote}Chris Winkler Diagnostician Bryans Road Sunoco in Bryans Road, Maryland Thanks everyone for the info it let me be a little opened minded before jumped into reflashing the PCM which it still might need will have to check. I looked at the alternator harness and it was laying on the harness coming up from the crank sensor but this did not make a difference…

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