Dead spot at 6500 rpm

[Plynch2]

Hey guys I have an m52 out of a 96 328 it's obd1 converted s52 cams 24lb injectors eBay headers and TRM chip the engine runs fine untill 6500 rpm on a wide open pull then it hits a dead spot stops pulling hard. I was wondering if anybody els had this problem thanks. :down:

[frankie591]

is it throwing any codes when you stomp test it?

[Plynch2]

That's a problem whoever made my harness did not make the check engine light work.

[drez14]

try changing your fuel filter?

[AndrewBird]

Fuel pump might be going out as well.

When does an M52 make peak torque? Could just be hitting the top of the power you have. I mean, why do you need to be accelerating hard at 6500 RPM anyway?

[Beej '86 325es]

What year/model is your chassis?

[328ijunkie]

If you dont have a cel you prob dont have a VSS signal either.

[frankie591]

Pretty easy to peel back the c101 and x20 plugs and connect the necessary wires. May as well make it right

[Plynch2]

The car is a 89 I replaced the fuel filter and pump. When I unplug the ecu it runs like crap for like 20 miles within that time it will rev out great. I don't need to rev that far I'm jest worried I have power loss in other places.

[SkorcherX]

When I unplug the ecu it runs like crap...

How does it even run? Did you mean to say you unplugged the MAF? Or maybe the O2?

[Beej '86 325es]

I would revisit your wire harness adapter first thing and verify you have these connections:
E30 C101 pin 12 to E36 X20 pin 8 (engine check light)
E30 C101 pin 14 to E36 X20 pin 14 (road speed signal)

[Plynch2]

Sorry when I unplug the ecu resets and it runs like crap. As for the wire there is a wight and black wire at pin 8 on e36 and on pin 12 e36 there is a brown wire that has been cut there is a big green and black wire going into pin 14 e36.