Black Scorpion won’t accelerate past half throttle

[JJon]

Black Scorpion 330hp will not pull after half throttle from idle to wfo @2500rpm(cold-165)doesn’t change. 30psi fuel pressure,58psi oil, 1-10psi water pressure (idle to wfo) ,15 map, 100% tps, comp 150 on 5-7, 160 on 1-3-2-4-6-8, 3 hrs on head job and gaskets. Cams not flat, lifters look great. Solid spark from coil to dist, cylinder fire is pulsing good, fuel injectors atomize good, not starving for fuel. No codes. Guys I’m at a loss, what am I missing?

[boatwakes]

Need more info:

1) Why head gaskets?

2) Was it timed correctly after the head gasket job? 10*BTDC using the computer in base timing mode.

3) Has the ignition module in the distributor been replaced? Look for white with green stripe, white with red stripe and black coming out of the bottom of the distributor. If there's no black, it's original. Change it if it hasn't been done.

[JJon]

Raw water pump locked up and burnt the belt off. Compression was low from leaking head gaskets. Base timing at 10deg adv. ignition module has not been changed. I don’t feel it’s an ignition problem, because from idling to wot there’s nothing past half throttle. From coming out of the hole to plowing to planed out. It’s running at basically 50% power from 600-700 idle rpm to 2500rpm. I’ll throw an ignition module at it to see if it resolves the issue. Thanks!

[boatwakes]

If the module is original and bad, all timing advance is controlled through it and it will present the same way, no power.

[JJon]

Replaced the ignition module, no change. Still won’t pull past half throttle. Ordered a cps and tps today, I’ll post the results when I get the parts on and lake tested

[boatwakes]

You originally posted TPS 100%, was that verified on Diacom or visual?

[JJon]

Verified tps, with diacom, I don’t like throwing parts at a problem but I’m really frustrated and ordered one anyway. Gonna change the cps first and if that doesn’t clear it up then put the tps on it. Thanks!

[azbjamin]

JJon Did you ever figure this out? I have a Black Scorpion in an 02 centurion that is also exhibiting the exact some condition. I figured out that the fuel pressure was dropping replaced the pumps and fuel pressure regulator and now every component of the fuel system and it is still acting up. I then wired a stand alone relay to the pumps thinking that the ECU was shutting off or there was some weird voltage drop happening but the issue still happens. I did not have the pressure gauge hooked up but it was the same behavior. I am worried that I was sold a faulty high pressure pump off the shelf.

[boatwakes]

You'll have to check fuel pressure while underway and also verify TPS is 100%.