m20B27 NEED HELP ASAP!!!!

[DeadWeight30]

Hi, Im new to R3v but, im not new to e30s, and i recently graduated from an automotive technical school. But i Have an 86' 325 , and I'm having an issue that i can not for the life of me figure out, need some input. Heres the issue,

The car will run and drive fine for minutes, hours, it happens randomly and doesn't show signs its about to happen. But after reaching operating temp, the car will stop accelerating. It retards itself to 2300 RPMS but will not rev past that while in drive, it also will not shift. Fluids are all good. If put in to neutral while the issue is occurring, it will rev out just fine. But when in drive stops at 2300 rpm again. The engine will start to run a little on the warm side, but it does not have misfire or any other intermittent issues. The only thing i have notice, and may not even be related, is the coolant light will come on, on my light panel before this all occurs.
Recent work includes, Head Gasket, New hoses, Thermostat, Both Fuel Pumps, Fuel filter, and fuel lines.
Also my inline pump screams, thats not as urgent as an issue because its pushing the right PSI, but i have not heard another e30 with a pump as noisy as mine, thats an OEM pump atleast.


PLEASE get back to me ASAP with your input, i need to figure out whats wrong so i can get it fixed as soon as possible. Is my daily driven vehicle.

[jlevie]

A loud pump is one that worn out or one that is having to work too hard. The pump being loud in conjunction with the lack of power suggests that there is a fuel delivery problem. With what has been replaced I'd look to the FPR and the tank. The first think I'd do would be to remove the in-tank pump & sensor and use a stick to stir the bottom of the tank. If there is a layer of rust there you have probably found the culprit. When the car is being driven, that rust can be stirred up by sloshing fuel, collect on the inlet screen of the transfer pump, and starve the high pressure pump. Shut of the car car a while and the rust will fall off and settle, until next time.

The fix for a rusty tank is either to replace it, or to acid clean and seal the tank.

[DeadWeight30]

well, it already has a new fuel pressure regulator, and the pumps are new, i havent been inside the tank yet, but when i had the intank pump out since both were replaced the tank looked fine, and im also making proper fuel pressure at the fuel rail, i dont think the issue im having has anything to do with fuel, also the pump is noisy all the time, even after having sat for 2 months with occasional start, but i do appreciate the input

[slammin.e28]

You change the fuel filter?

...especially if you put a new pump on.

[DeadWeight30]

yes sir