Hello all,

This my first time posting and hoping to get help with a diagnosis from the many insightful members of this forum where I typically find the answers to my fix’s from existing threads & posts.


My 1999 F150 (4.6 2wd Automatic) just recently began to slip or not engage into gear (3rd I think). It drives normal in reverse and up until it reaches 35 mph when it then it feels like i am driving in neutral, where my RPM's rev up when given gas and there is no acceleration until the truck slows enough (about 15-20mph) to get back into previous gear.

Engine light came on about an hour before this started happening and had it read at AutoZone after the slipping began. The code read I was misfiring on #1, so I changed plug and wire but that didn't change anythingl. (CE light is no longer on though)

Thoughts on this being strictly a transmission problem and only a coincidence with the CE light: bank 1 misfiring (could that even cause of the feeling of the gear slipping/missing described above?)

- Is it worth trying to replace the passenger side coil pack since wire and plug already changed?

Other info:
- Trans fluid level is full and clean. (Changed 10/09)
- Had an alignment the day before this started (another coincidence?)
- 4 months ago cleaned TB, IAC, EGR, and changed DLPF sensor in effort to fix hesitation/acceleration problems i was having at about 45mph. (this helped significantly but still felt it at times).

Thank you in advance
Jeff

 

Did the OD Off light flash? If so, there's a tranny code stored and you need a high end scanner to read it. However, this sounds more like a transmission internal issue.

 

About the OD Light, no I didn't notice the light flash. The trans shop said they did run a scan and found no codes.

Jeff

 

Thanks glc.

I took it to the shop today and I they called me saying they discovered a spring had come loose near one of the pistons and fortunately doesn't look like it will need to be a rebuild. They called while in a work meeting and I couldn’t really talk, thus the vague info. However, I am heading to the shop this evening to see what a $350 "spring replacement" job looks like before I give them the go-ahead.

Do you (or anyone else) know what and where this "spring" repair could be?


thanks

 

** Here is the update to my transmission problem and perhaps saving some $$ to anyone having similar problems. **
It turns out it was the Acumalator 2-3 piston and spring that needed to be replaced. After forking over $380 to the shop for the repair I browsed this site and found some informative postings and discovered it might not be too tough of a repair to take on yourself.

here are some of the links I think could have saved me some dough!

https://www.f150online.com/forums/tr...tallation.html

http://www.markviii.org/LOD2/1_2_Accumulator_paper.htm

hopefully this helps someone else experiencing the same problems.

thanks
Jeff

 

The upside is you found what seems to be an honest transmission repair shop. A large number of them would have said you needed a complete rebuild and charged you accordingly. $380.00 bucks seems a little steep right now but really they charge around $100.00 bucks an hour so if I guesstimate it was two hours to find the problem and 1 hour to fix and the rest is parts that is not too bad. $380.00 vs $2000.00 to $3000.00 is a win all day long in my book.