Stihl

So I got my truck back from the shop, they put in a brand new A518 with assorted billet internals ( same stuff that was there before ) and WOW it's sluggish top end. It's the same transmission, converter combo. Nothing else has changed. I went from 35lbs boost to 25 - pulling hills I'll be in the 26-2800 rpm range and no smoke, doesn't get hot and a lot laggier. The non-smoke and lower boost #'s I might understand if the old tranny was slipping and making the engine work harder, but not the laggyness. The shop said they didn't change anything and all internal parts were the same or heavier duty. Throttle linkage is still the same. Any ideas?

jogl

What about your EGT's? Sounds to me like your power is down. Did you fill up with winter fuel?

Good Day,
JP.

Stihl

EGT's are low .. I can't get past 800 even on incline, havn't tried under load though. Used to get to 1600 within 8 seconds with smoke

jogl

Something got bumped and now you are not getting the fuel you used to. Check your throttle linkages, fuel lines (maybe one got bumped and pinched off), fuel pressure, etc.

You'll find it!
JP.

wannadiesel

Check the AFC boost line.

Stihl

Thats the banjo bolted line going directly into the rear of the injection pump right? The linkage is correct, pushing accelerator makes full travel just like it used to. Slow speeds is just as peppy, it's just the top end. Feels like I'm not getting the same fuel or something

wannadiesel

Yup. You are not getting full fueling for some reason, the trans is not the problem.

Stihl

The line is the same as it's always been, not leaking or anything. They said they didn't touch anything, transmission and throttle valve cable were the only things replaced or messed with.

wannadiesel

Make sure your fuel pin is not stuck.

Stihl

Pulled it out and put it back in, drove around. Same thing. Boost caps @ 25 .. rpms cap at 2600. It's not horrible but it just doesn't get up and go high end like it used to. Just confusing

wannadiesel

Did you have somebody else push the pedal while you watched the linkage or did you just run it by hand under the hood?

Stihl

Had someone else push pedal, full travel

Boatnik

Could a fuel line got damaged during the tranny removal/reassembly?

TOMTOM

Trans fluid level? Some times when fluid is replaced the tube is coated and appears to be full when its not. Happend to me.
TOMMY