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hdbroker's avatar
hdbroker
Explorer
Aug 21, 2020

V10 4R100 lost power on a mountain

So I am cruising up the Blue Ridge Mountains pulling my 33 ft TT doing 65 mph, Suddenly the engine bogs down and I have no power. It felt like the torque converter locked in 1 to 1. The transmission would not down shift. I let off the accelerator and then tried to accelerate again and still no power. It has happened three times, twice on hills and once on flat.

I have lost a coil pack before and when that happens the engine runs really rough. It didn't feel like that. It feels like the engine just doesn't enough power and the transmission should be down shifting but is in overdrive. When towing I am in tow haul mode overdrive off.

I pulled over to the side of the road and eventually I put it back in Drive and pulled out and everything was normal.

This vehicle is in great shape but I do not know the history of the power-train. I am considering dropping a new crate engine and transmission in it just for piece of mind. I bought it with 160,000 because it was so clean and in such great shape. I only use the vehicle for towing the TT, it is not my daily driver.

Any thoughts or opinions? Thanks for any help.

23 Replies

  • If it is a 4R100, the TPS is the likely culprit, as it does control shift points and fuel map compensation.
  • What year? Based on your symptoms, you must have a 2005 or newer?

    Sounds suspiciously like a faulty electronic throttle body / MAF assembly.

    You most certainly should get it properly diagnosed. A new engine and transmission wont' fix this problem if its the throttle body assembly. And will easily cost many thousands, vs a couple hundred for a new TB.

    Are you sure you have a 4R100? Because that trans doesn't have Tow/Haul mode.
  • Check the codes and have someone smart look at it before you go out and spend a lot of money. Your trans may be getting towards the end of its life.