2007 f150, 4.6 2v, reg cab, long bed, two piece driveshaft, 3.73 LS diff, superchips tuned.

Problem: shudder at dead stop take off, i only feel it going stright, NOT turning. only for the first 10feet or so. Also only at heavy throttle 70% or more, Doesnt NOT do it when i take off slow, or if im already moving.

Things I Have done last: Changed trans fluid, found it to be almost 2quarts overfull, didnt change a thing. Changed diff fluid not to long ago with 75w140 with the modifier.

Things I thought it might be: Other then the above the truck was custom lowered a few years ago, thought about the drive not being lined up right, but i never had no problem with it, at least i never felt it till about a month ago. Thought it might have been the tires trying to break loose, nope.

SO the following has run thru my mind on what it could be: i been reading alot of stuff on the web alot ujoints, slip joint, clutches in the diff, abs sensors, bottom line is i dont know what to believe or what to start with. The Truck has 68k i highly doubt anything could be that bad yet.


OTHER THINGS: Since i had an issue with accel coil i was forced to buy some very cheap coils, by cheap i mean all 8 shipped for around $80, later found out there form china, theres no nothing on them, after looking them over lately i have relized the spring inside isnt as long as the oem where. Also i had one just randomly quit a few days ago, i went to advance and got a bwd then started noticing alot of differences between to two. Also at small throttle push, i have noticed like a jump/misfire/spit at 45mph. almost feels like im running over rocks in the road, but it only does it ever now and then, and unless you know it does it, you wont never feel it.

MY GUESS IS: that my cheap coils are slowly failing and not suppling enough voltage to the plugs so that my take off isnt strong, therefor it almost acts like an all motor misfire and almost kills the motor but picks back up, and repeats itself under heavy accleraion, so it almost feels like a slip. Regraudless i still need to change those coils out, and i hope it sloves my issue. but i never have felt a true misfire yet. I dont think this is tranny related, i think its something else.

Does anyone have any thoughts or ideal on what else it could be?

 

These coils can be trusted:

http://www.ebay.com/itm/New-Visteon-...2fa4a1&vxp=mtr

 

Low grade misfire. I had the same symptoms and it ended up being a small split in my spark plug boot. It was very difficult to diagnose as you could barely see the break. I dont have COPs but it seems like a weak COP would have the same effect. Most likely a spark problem. Buy a decent set of coils. My .02$. GL

 

well im glad to hear a few people agree with me and have had the same issues, i thought i was loosing my mind, i can almost say for sure its a spark issue, i know this motor doesnt like anything but motorcraft plugs. It seems it started getting worse as time went by, and after that one cop died. I used to be able to barely hit the gas and break the rear tires loose all it does now is this issue. Thanks Guys.

i brought something very similar to this http://www.ebay.com/itm/Ignition-Coi...#ht_5371wt_932
which is whats on there now, well 7 of them anyway the other is a bwd. i got a set of slighty used motorcraft cops set of 6 all i need to do is find one more and wait for them to get here.

parnaz, its funny you mentioned a boot, last time i took my cop's out ever last boot came off the coil and two of the cyl looked to have had water in them, so these are not only cheap coils, the boots are not sealing either. $10 each sounds like i got what i paid for. but again not thinking, i needed 8 cops asap these where on ebay and in florida, didnt really look for details, seen that they fit, and closest to me. oh well i got a good year out of them and about 12k miles.

thanks guys

 

Maybe I'm just a little late to the party but have you considered checking your u-joints? I currently have a bad u-joint and I have a similar problem.

 

The same seller I linked also sells single Visteon coils for $25 each. Visteon is Motorcraft.

 

OP, I also have a very similar problem. Mine is a 2006 5.4L, bare stock. 72k miles.

Only about 3-4 times a week, I have this issue. On hard throttle, as if to enter the freeway, etc., I can feel what seems to be one of the cylinders misfiring followed by a pop from the exhaust. If I stick to the throttle, it will cycle through about 3-4 engine rotations, then go away. If I let off of the throttle, it goes away immediately.

This happens at different times: cool/warm engine, low/higher speeds. Just during heavy throttle.

I am wondering - spark plugs or wires? Anyone have advice?

 

as a mentioned above that i have very cheap coils on mine one has already went out and im guessing the others are slowly behind, i have ordered a few oem type coil i should everything back to normal by the end of next week, then i will let everyone know what the outcome was.

if your check engine light is on i would get that scanned and see what that says.The 5.4 3v are all on there own. i dont know to much about the 3v motors, im sure someone else will step in and answer your question better.

 

It depends what your calling OEM type. All the coils out there say they are OEM replacements.

Go with Vista-Pro's and you'll be alright.

 

You don't have wires. You have a coil on top of each plug.

You are due for new plugs.

 

well i found six motorcrafts and already have one bwd on there, i think ill get one of the vista's and ill be good. btw when i mean oem type im comparing them to what come with form the factory aka motorcraft

 

I forgot i do know a little about the 5.4 3v just dont own one. changing the plugs may or may not be harder then you think, if you dont know about the spark plug issue that may be in yours, search this form for it. i would start with the plugs as glc said you are due for a change anyway, so its not going to hurt nothing, to my knowing there are only three plugs you can get for the 5.4 of 06 i believe. motorcraft, autolite, champion. also i have heard that both autolite and motorcraft are the same plug i believe there owned by the honeywell comp. and in my exp. i have not had good luck with champion. everything lately i been changing has been either autolite or motorcraft. I know my motor is picky on plugs it so far only like motorcraft not even autolite. That would be the plug i pick. Just to let you know if you dont the plugs are around $12 ea and up.

I would do this first, then if the problem is still it i would go more in detail, hope this helps

 

The best plug for a 2006 3V is a Motorcraft SP-515. They are $9.42 each at rockauto.com.

 

The best One-piece plug for a 2006 5.4 3V is Champion 7989.

Still running flawlessly. Always replace the boots - cheap insurance, imho.

No impact, no Lisle tool, no histrionics, no thrown objects, no choice cuss words, no drama. Ergo - no-brainer,

 

since we are naming best plugs, i dont want to get off topic, but im running the motorcraft sp-493. only because the motor dont run very good on anything else

I have tired: bosch +4 (always thout 4 grounds where a bit much) then went to bosch +2 same thing, gave up on bosch after that, so i tired e3 back when they made good plugs, i run them for quite sometime before i had problems, got a new set of e3's, didnt work, that done it for e3. since all of the above was under wrnty. i got a little bit of money back everytime i took them back and switched, not only did i try 3 different types of plugs, and free replacement once, but this last time i switched them out for motorcraft, i got a plug that actually worked, on top of a $20 difference back in my pocket.

Basically i only brought one set of plugs when you think about it. Anyways just wondering what type has been used the most of and WORKED. I have heard good things on every plug out there, but since i had problems in the past i dont know. One other thing i was told this motor will only work/run the best on M/C plugs, was told not even the A/L would work. Arent both M/C and A/L owned by honeywell?