Low power/torque on 3.8 and high fuel consumption - Page 3 - The Unofficial BMW M5 Messageboard (m5board.com)

Robinson · 9th July 2009, 21:51

Quote:

Originally Posted by ///Manuel

Alright, I'll suggest a couple things more then I will shut up (I don't really know what I'm talking about anyway

).

I would check to make sure that the DME is receiving the signal from the coolant temp sensor(s) correctly. I would also try disconnecting the air pump (unplug the relay, additionally review the wiring diagram of all sensors going to the DME). How long has it been since you ran some injector cleaner? Have you been trying different gas stations?

Lastly, I would make sure that the exhaust manifold bolts are all tight.

To answer an earlier question from Robinson about the air pump vacuum pipe, I would simply make sure it's plugged and that it's not causing any vacuum leaks as a result.

Have any pictures of the E28

?

Thanks Manuel, I have checked mine and found that it was plugged.

Regards

Sharkbite · 10th July 2009, 01:39

Quote:

Originally Posted by marekd174

Well, I pulled off the cats today and they are fine, no melted core and not plugged. I don't hear an exhaust leak and used new gaskets to put it back together. I also installed a set of new plugs and the battery cable was off for the 3hrs it took me to do it.

Got back in did a 100km drive and no change. I also disconnected the air pump as per earlier suggestions. No difference.

Well once the TPS arrives we'll see, if not then a new MAF will be ordered making my wallet significantly lighter.

Don't buy a new MAF, just send it to Louis Ott . He's the Bosch Maf guru. This is the same unit as a Porsche 928S-2 and Ott's the man !

Google his name.

I've had several conversations w/ him and he'll get you up and running fast.

marekd174 · 10th July 2009, 15:47

Quote:

Originally Posted by Sharkbite

Don't buy a new MAF, just send it to Louis Ott . He's the Bosch Maf guru. This is the same unit as a Porsche 928S-2 and Ott's the man !

Google his name.

I've had several conversations w/ him and he'll get you up and running fast.

Unfortunately the 3.8 MAF is only used for that car and no one I know rebuilds them.

Montanvs · 7th October 2009, 07:22

marekd174, Did you ever figure our what the problem was? I'm having similar issues.

marekd174 · 7th October 2009, 07:26

I replaced everything but the MAF. New plugs make the car run better for about 2 days and they get fouled again. I'm sending my MAF to Injection Labs tomorrow, to see if they can rebuild it. If they can't I'm going to have bite the bullet and get a new one $$$$. If you car is a 3.6 then Injection Labs can rebuild your MAF with a 2 day or so turn around.