I've got a 1990 740 with the B230F and after a cold start the revs stay a bit too low on idle. Something like 500rpm. If I pump the brakes the revs get up to where they are supposed to. When I stop the pumping the revs go back down.

Any ideas what could be causing this?

No it does not run fine. It barely stays idling with the coolant temperature sensor or MAF unplugged and if I touch the gas pedal it stalls immediately.

I just changed the FPR. Didn't help.

I also tried unplugging the coolant temperature sensor. I can get it running just as I could when unplugging the MAF. Although the outside temperature is about 24c and not around 15.

Hi, I just got my hands on a mint condition 740. It's got B230F LH2.4 and I can't figure out what's bugging it. It starts up fine but won't stay running. Just bogs down immediately when the revs come down to idle. Here's a small video of me trying to start it: https://www.dropbox.com/s/8p7qo8nrnz5qx...

I suspect my pinion bearing on the diff (where the driveshaft enters) is faulty. I get a lot of howling on the highway and at speeds from 50km/h up. Especially on light throttle. When I lift off or accelerate it kinda quiets down a bit. Any instructions on how to replace it? Do I have to pull the wh...