Tuning issue, or worse?

[thomcasey]

Here is the lowdown on the car.

1990 Talon TSiAWD
Fresh engine rebuild (1g big rods, 2g pistons)
16G turbo
550cc injectors
255 fp

at 50 miles post rebuild, oil pump sprocket came loose, causing a spun rod bearing. Oil pump and all bearings replaced, crank turned and polished (bearings matched to machine work)

Now, since this was taken care of, car is having what I consider fuel knock. I don't think it is metallic since the knock isn't present at idle or when hitting the throttle hard. I have attached two video links so you can see for yourself. Also, an APEXi unit was used to tune with (it looks pretty, but I don't think it did a good job) but it didn't help the issue, it still ran way rich as it does now. Let me know what you think.

YouTube - Possible Fuel knock #2

YouTube - Possible Fuel Knock?

 

[spydur8385]

Definately sounds like a fueling issue and or an exhaust leak.

 

[jay4725]

Who did the rebuild? What do they have to say about it?