Bmw 530i M30 Misfire

[sixpotbeemer]

Hey guys, posted a post a while ago about putting a 730i M30 Auto engine into my 530i E34 Manual, it has now been done, 730i engine bolted onto my 530i gearbox/flywheel. It is running rough, changed sprk/plugs, checked the distribitor, put the HT leads from the old engine on (which were OK!!!), it has the same HT Coil as the old engine. The OLD Engine run great, just blew a head gasket (Due to a Crap Mechanic fitting a Water Pump with no proper gasket, or now am told!!!)) DOH Had this engine from the 730i put in as it was cheaper than a head-off job and it has done less mileage. The OLNY Problem is it is missing like F****????? One observation is, the very thin pipe that attaches to the PCV (Positive Cranckcase Ventilation) pipe from the rocker cover has broken, the main thick pipe is ok but the thin pipe has a massive gap in it, I can't trace it but it seems to originate from the manifold, please help me. The guy who fitted the engine is looing at it on sat, but if anyone can suggest anyhting that would be swell!!! Cheers you guys, and DON'T forget BMW's RULE, end of story!!!!!!!!!!!!!!!!!!!!!

[BillionPa]

one of the spark plug wires switched?

[632 Regal]

fix the leaks, make sure theres no oil in the plug region and maybe/probably replace the plug boots. what distributer???

[BillionPa]

well, he said its an M30.......

i dunno either!

[Karl]

Ditto what Regal said. Vacuum leaks will really make it idle rough and be real tempermental in the off-idle transition. Remember the whole crankcase runs at a vacuum because of that breather tube connected to the throttle body so any seal could be a vacuum leak. I chased a lot of ghosts before I found a split in that breather hose.

[genphreak]

well, he said its an M30.......

i dunno either!

Your engine is an M30B30, M30s came in many different capacities, for example the 3.5 is an M30B35.

Yours should be an easy fix. The hose goes down through the manifold pipes and connects to the underside of the plenum chamber- by feeling around with your hand behind it from the other side (ie snaking your hand down and up under the manifold beside the oil canister you will be able to pull the old hose off. A metre of new hose will do, I think it is 3mm Internal Diameter, just pull the one that tee-s into the valve cover hose (vent hose) to see. Replace the one that runs from beside where this one feeds from the manifold connects to the Fuel Pressure Regulator up top also, it is larger internal diameter- maybe 4mm. Each are only 2' Long or so. Check also that the brake booster hose has no leaks- it feeds from the inlet manifold- but up ontop where it is easy to get to...

[632 Regal]

mattering what part if the f_king world he is from a 530 is a V8 which is a M60...there is no distributer so im done with this thread til we know a little more.

[sixpotbeemer]

My baby has the 2986cc M30 in line six music masterpiece. The 530i engine taken from my motor (blown head gasket) was 9.0 to 1 comp ratio 530i motor 188bhp, the 730i dropped into my motor is the 9.2 to 1 comp ratio motor with 197bhp. This is the same 9.2 to comp ratio that afforded the 635csi with 220bhp as appose to the 535i e34 of 211bhp, big deal ay!!! My engine still running rough, hopefully fixed 2moz by the fella who dropped the engine in!!!

[632 Regal]

ok so your from another country which remains a mystery, the engine then remain a mystery and nobody can do the reasearh you should do for yourself to help you isolate the problem.

"hey guys i have a 32 hp deisel lawnmower, its missing help me"

[sixpotbeemer]

Hey mister Regal, you are a funny fella, thought all BM owners were form the same country because we appreciate the quality of the motors from Bavaria, because that is why we are on this chat group trying to help each other!!! I don’t have a lawnmower but maybe when I acquire one I should consult your good self!!

I am from the UK (England, Wales actually, not the ones that swim around, a suburb of the UK for your liking) by the way, anyway, we don't make very good cars nowadays that's why I have a BMW!!! Why do you drive one fella!!