Rough idle, and stuck under 2000rpm

[EndreM]

Hi guys.
I just bought a new E30, and drove it 700kms without big problems, but ten minutes from where I live, it suddenly lost power.

It wont go higher then 2000rpms, and if I push it, it stutters and backfires out of the intake.

Any ideas?

The car is a 1986 320i

[jlevie]

The first thing I'd check would be rail fuel pressure and delivery rate from the FPR.

[EndreM]

Thanks, Ill have to check it later today.
I changed the fuel pump, as it was really noisy, but it didnt help.

I cant wait to drive this car!

[jlevie]

You still need to check rail fuel pressure.

[EndreM]

Yeah, I know. Im going to steal my friends FPR tomorrow, and see if it helps.

[EndreM]

Any other ideas in case its not the FPR?

[jlevie]

Yeah, I know. Im going to steal my friends FPR tomorrow, and see if it helps.

That is not a substitute for connecting a gauge to the supply line to the fuel rail. What you are contemplating is "throwing parts at the problem while hoping for a favorable outcome". Get a gauge, tee it into the supply line to the rail, and see what the rail pressure is when you try to drive the car.

[EndreM]

Thanks for helping out, it was the AFM that was acting up.
The parts I replaced desperately needed replacing anyway, but I see your point.