Hi Guy's,
Any thoughts on this, I just got this '03 F150 with 60,000 miles. I had my mechanic go thru this truck, he said it was all good, I did have him change the transmission fluid. It was the only thing that was done. once in a while when I start out I'll get a slight vibration, or slight shutter, it doesn't do it too often, and it goes right away, any thoughts on what it could be ?
Thanks !

 

your going to have to run for a while and get more info... Are you saying when you start the motor in the morning it shutters for a few second then cleans up... or when your stopped at a stop sign and start moving, it shutters till you get to 10 mph ? Does it do it only on cold startup ? Does it do it after it warms up ?


First thing in the am, the fuel rail might not be to full pressure. When you startup, the fuel pump has to fill the line.. Might shutter for a few seconds until the pump gets up to pressure.


Monitor the radiator coolant overflow tank... does it use any fluid ( drop in a month ?)

 

Thanks for the reply, I've only noticed it when taking off from a stop sign, its very brief, and not all the time, the truck is warmed up, any idea's ? My truck has the 5.4 in it. FX4
Thanks,
Scott

 

I would say 50% of these problems are misfire of one cylinder. There are COPS ( coils) one on each cylinder ( I assume you have a V8). One of the COPS is starting to break down and miss under load. Sometimes you can be moving at 40 mph, punch the throttle and "make" it do it ? Normally the problem will get worse over time, then will be easier to find. When bad enough, a CODE ( light) will be set on the dash and then you can determine which cylinder is the problem........ of course, there are other possibilities, but COP failure would be most common

 

Thanks for getting back to me, its just got me worried its not a transmission problem, I've only put on a few hundred miles, tomorrow I'll call my mechanic, and run it by him, and stop there after work.

 

 

+1.
Especially if you have the steering wheel turned when you start up.
That’s when the limited slip axle wants the clutches to slip.

 

That's' what mine does. I bit too much but I'm not changing the clutch packs.

 

Hopefully my mechanic can track it down, he's a great guy, top knotch mechanic, always gives me a hard time, he's a chevy guy, his only fault ! He worked on it last week, all he said was it sure is clean, and no problems.

 

No need to change the clutch packs. Just add four ounces of the limited slip additive to the rear diff.

 

What fluid was put in the transmission?

 

I don't know what fluid he put in the transmission.

 

I have had a few vehicles with 4r70w transmissions and fluid matters... universal and additives are crap! I had a couple T-birds that would shutter when the fluid would break down. Drain and refill with Mercon V and I was good for another 30k.

Mercon V from Ford is what should be used.

 

transmission shutter is normally at higher speed.


he never said the shutter happened when turning.

 

I don’t think he indicated it happened at higher speeds.

I was trying to get him to say weather or not it happened when he started out with the wheels turned or straight. I still don’t know if it happens when starting out with the wheels turned, as in going around a corner. Do you think it does?