Hey,

My truck is a 2004 f150 fx4, super crew.

PLEASE HELP PLEASE!

This is very strange and its a problem I want fixed, considering I just bought this truck and want to drive it . What it is, is a knock on acceleration on when in drive or on while accelerating. If you put the truck in park, and rev it up, there is no knock what so ever. It is slightly there at idle. One thing, if you put it in drive, hold the brake, and gas it up to about 1,000 rpm, it knocks extremly fast, and if you hold the brake, and give it a quick accleration to 1,000 rpm, and left of slowly, it has a couple clicking noise right at decelleration. The real noise is, when you just driving, and you at any speeds are accelearting, there is a pretty loud clicking / knocking noise. We have took the front belt of, to make shure it was no front accesories such as alternator and so on. This problem has me stumpped. I know the sound I am almost positive is coming from the engine. I have tried higher grades of fuels, different oil grades, and even we put lucas oil in one change just to see what happened but no luck still there, so we put regular oil back in it. Thats problem one #1.

Problem #2.
When you're in drive, and at a stop, you slowly accelarate to get up to speed, and between 0-5 mph it has a vibration, almost seems like its the rearend just shaking pretty bad, but the rearend has oil. We did chnage the rear wheel seals because of a leak that I had.

 

#2, did you use friction modifier in the rearend when adding the fluid? I think the lsd clutch packs need the friction modifier or something. Where's Quintin when you need him.

 

As per #1, go to the dealer and tell them you think TSB 06-03-03 applies to your truck. Sounds like you may need the colder plugs. I *think* may have the same problem but not as severe on my truck...

 

I had that tsb done but the spark knock issue is still audible. Not there with 93 octane, but with 87 octane it's still there, I'm going to take it in soon. I'm running 93 right now so it doesn't ping till I take it in.

 

did you have codes or a CEL?

My dealer refused service because they didn't have codes or a CEL

 

No codes, just told them about the noise I heard. My technician is a friend of mine too, so I bet that had something to do with the deal. It's concerning it still being there.

 

hey,
thanks for the help, i am going to the ford dealer here to see what they say. Can someone expain to me what TSB 06-03-03 means? I am going to add that friction modifier also, thanks again!