Hey guys, so I'm chasing down all the little quirks about my truck, and here's the next one.

When I floor the accelerator, it seems like the truck has very little response.

When I'm on pavement where I have traction, and I hit WOT hard, I can hear the turbo spooling up considerably, but the actual acceleration of the truck is very slow. It doesn't feel much different than if I had applied the throttle gradually.

I'm wondering if I don't have a boost leak somewhere. Some of you also know that I'm dealing with about 7.5mpg fuel economy right now, and I read somewhere that a boost leak will kill fuel economy too. I seem to recall seeing a way to test for a boost leak, but don't remember the details.

Now, when I'm on icy roads, where I can spin the tires easily, the engine seems to lag horribly. I took a (poor quality) video of it today to hopefully better explain the issue. If I'm puttering along slow, and floor it, it runs up to about 2000-2100rpm, and lags for a minute, then shoots up to 3000 like I would've expected. In the video if you watch the tach, you can see that I do this twice.

https://www.youtube.com/watch?v=OfKRgwP3z2s

Anybody have any thoughts? Might the issues all be related?

EDIT: For some reason the video clip won't embed in the post, but please take a moment to watch it, it's only 14 seconds.

 

Anybody have a thought?

 

Do you havea tuner on it? Boost leak, up pipe leak or maybe your tranny is slipping?

 

No tuner.

I don't know how to tell if the trans is slipping, but it seems to be acting normally.

 

When's the last time the injectors were done?

 

Injectors, as far as i know, are original. 130k miles on the truck.

 

You have an auto trans? If so, it is definitely slipping. Bad torque converter possibly. That's just a little bit I can tell from that video. Your RPM should not be revving that high when you're trying to get power to the wheels.

 

Why shouldn't it be? I was on ice. No traction. It should be no problem for the engine to rev up and spin the wheels in conditions like that. I don't see how it's any different from a truck on a dyno? Engine RPMs way up, wheels spinning, truck stationary.

When I'm on pavement and have traction, the engine doesn't rev like that at WOT. It will grab and accelerate normally.

 

Oh ok...missed the ice part. Sorry about that.

 

No worries.

I'm just trying to figure out why it pauses around 2100-2200 RPM before it shoots up. But maybe it doesn't matter. On dry pavement when I have traction it will shoot right up no problem. Maybe it's a CPU thing, protecting the transmission? I dunno. It doesn't affect my daily driving though.

 

leaf blower on exhaust and spray foamy liquid soap on every flange/ connector
on turbo intake make a adapter from a 3 in Fernco coupling (measure before buying in case different) and a 3 in PVC cap with short piece of pipe in it, drill 1/4 NPT fitting for air chuck, place other Fernco end on turbo and pressurize to 20 psi with a regulator then look for leaks at all connections and intake runners
Weak fuel pump pressure can cause high EGTs as well since boost is reduced from lack of fuel, should never be less than 40 PSI WOT in third gear. A liquid filled gauge and a length of grease gun hose with a few fittings can allow the gauge to be read out side of the hood.