M50 manifold swap, rough idle...

Post Sun May 24, 2015 12:47 pm

Hi Guys

Just completed the m50 manifold swap on my e36 328i.
Went & started the car, but it seems to have a really low idle & feels like its missing. Generally behaving like a pig.

I will double check all vacuum connections etc shortly, but if I find all is ok, will this issue iron itself out eventually?

Car only has 85k on the clock & ran spot on perfect before.

Post Sun May 24, 2015 1:32 pm

Bound to be a vacuum leak after the MAF

Post Sun May 24, 2015 4:14 pm

Just taken it all off to check & redo...
Still got the same issue, getting pissed off now, cant remember how many times I have taken this apart now.
Almost feel like going back to standard.

I have used an alloy machined adaptor, so I can use all the original hoses etc, brand new intake gaskets, metal plate between tb & manifold.
I also extended the 2 small vacuum hoses to help with re-fitting.

On the back end of the m50 manifold I blocked off a vacuum line-in & left a sensor in the other hole as a blanking plug.

When fitting the m50 manifold, I have been really careful to make sure all connections are 100%.

Getting vex now, need this car running properly before end of day.

Post Tue Jul 14, 2015 9:40 pm

I've got the exact same problem, have you solved your problem yet?