Loss of power

[Josh mcleod]

Maybe you guys can help me narrow this down. When I try moderate to high acceleration (around 3000 rpm), the engine starts to surge like I'm pumping the accelerator and basically stops accelerating when this happens. I now have to accelerate like a civilized driver. I can reach any speed as long as I'm really light with my foot. While in park it revs perfect, just not under load. A few other things to mention, this started to happen when it got really cold for a week -35c (-31f), I have an xcal tuner and have tried different tunes with different fuel grades, I have 85000 km, original plugs and wires.

I'm thinking it may be as simple as a fuel filter but not sure. It's cold here and don't have a warm place to work on my trac. Will a pluged fuel filter still allow the engine to rev perfect in park? Thanks

 

[Bob Floyd]

Yes lack of fuel can cause lack of power at WOT and it does not take much to run up a engine with no load.