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2004 - 2008 Ford F150 General discussion on the 2004 - 2008 Ford F150 truck.

Unusual cam phaser issue?

 
Old 03-12-2019, 09:23 AM
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Originally Posted by techrep View Post
How many of those miles have you owned it ? did you get any maintenance history when you bought it ?
I bought this truck less than a month ago. Service history included typical stuff, brakes, oil changes every 5k, nothing engine related. I was told that all the plugs and coils were changed when I purchased it (which was a plus considering the issue with them breaking) then a week in, it threw a p0171 code which is bank 01 too lean. Then a day later, misfire cylinder 3 and O2 sensor 01 bank 01 stuck too rich. Thatís when I brought the truck in to get it checked for a vacuum leak. No vacuum leak, tested on smoke machine. This was the point when my mechanic diagnosed a cam phaser issue, but since thereís no knocking or ticking, Iím a little wary to spend 3k on a whim. Turns out that the ďdealerĒ I bought it from hadnít changed plugs or coils. A call to him went like this ďoh did I say plugs and coils? I meant that only the VVT solenoid was replaced, but we already cashed your check so youíre SOL.Ē Heís a dick, so what could I do? I swapped the cylinder 3 coil for a different one and the misfire code followed, so I replaced the coil and cleared the codes. None have returned. Now I still have this issue with the shudder under moderate acceleration, but if I apply more throttle or let off when it will run smooth. The CEL is not on, but did blink the other day during heavy acceleration on the hwy, then went off. Based upon advice from this forum, Iíll proceed in this order:
full set of new plugs and coils, remove and clean O2 sensor 01, clean throttle body, clean MAF, check fuel pump.
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Old 03-12-2019, 10:28 AM
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Misfires will produce your lean code. (SEEMS backwards to our logic -- but they dump unburned oxygen into the exhaust just like a vacuum leak. O2 sensors ONLY sense 'Oxygen'. This will will lead to PCM lengthening injector pulse width to the MAX --- equals O2 sensors stuck rich).

And if you don't eliminate this problem - and the hard 'Shudder' that will bounce coins out of the ash tray - the timming chains will slap hell out of and trash plastic chain guides. That debris will clog oil pump pickup screen,,,, and you will be doing a timing job soon.

You might pickup a tidbit of useful information from my lengthy experience with the IDENTICAL problem - and end result posted here.

https://www.f150forum.com/f12/ford-f...4/#post4405407
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Old 03-12-2019, 10:31 AM
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Plugs and boots and springs first... COP's should be good till bad. a new set of OEM coils will cost you over $500 and may not even be necessary.

Buy SP-546 motorcraft plugs.
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Old 03-12-2019, 03:43 PM
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Originally Posted by techrep View Post
Plugs and boots and springs first... COP's should be good till bad. a new set of OEM coils will cost you over $500 and may not even be necessary.

Buy SP-546 motorcraft plugs.

Sounds good, Iíll try the plugs, boots and springs first and post back once theyíre in. Would you use dielectric grease on those?
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Old 03-13-2019, 03:16 AM
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So since Iím replacing the plugs anyways, seems like it might be worthwhile to do the coils, these reviewed seem to have fixed others low load misfire problems in reviews. Price it right, but how important is it to have OEM coils?

Amazon Amazon
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Old 03-13-2019, 06:27 AM
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Originally Posted by Bonczyk View Post



Sounds good, I’ll try the plugs, boots and springs first and post back once they’re in. Would you use dielectric grease on those?
Just a dab on each end of the boot for a good seal.. I use a q-tip and swab the inside of each boot end.
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Old 03-14-2019, 04:21 PM
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Originally Posted by Ecobuilder View Post
You have a misfire condition occurring. Scan for code set to see which cylinder/s the misfire is occurring in.

From there you can do the procedures to determine what is causing it.

Pull COP on suspect cylinder and inspect closely. With COP uninstalled, remove the spark plug and inspect. Dedicated spark plug socket for this engine makes easier job of it. Check porcelain on spark plug for cracks and ensure gap is within spec.

You'll want to confirm correct coil and spark plug is installed. If condition of both appears good, reinstall spark plug and swap the coil with another cylinder and see what result you get. Torque plug to between 25-28 ft/lbs.

Misfire stays on that cylinder and doesn't follow the coil that was swapped, replace spark plug and test again.

If misfire moves with coil, try testing the coil with a spark tester, remove boot and spring, clean spade terminal at top of coil and install a new boot and spring. Small amount of dielectric grease at top/bottom of boot.

If misfire remains, next check will be your fuel injector.

Hoping it ends before this.
I had this issue. I had changed plugs and I had this exact same issue. I pulled The cop and Plug and the electrode had dropped down. Then I remembered one of the plugs was dropped on the ground. It finally gave installed new plug Bingo.

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Old 03-15-2019, 06:44 AM
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yeah.. can’t drop the spark plugs.. suggest you inspect out of the box too.. I found cracked porcelain on a brand new plug.. somebody else must of dropped the box.
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