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Posted

Hi all, after selling my E38 7 series 6-7 months ago, i'm back in a beamer an S reg 323i with a 2.5 engine (confused, can anyone explain?)

Really pleased with it overall, drives really well and the engine pulls like it should but is a little lumpy/rough on tickover, doesn't stall just hunts a little, from what i've heard it could be the idle control valve but can anyone tell me if it maybe something else?

Any help appreciated, cheers in advance

Anyway here are a couple of pics

post-5126-0-77750000-1376835370_thumb.jppost-5126-0-05814700-1376835384_thumb.jp

Guest Mister Dabsy
Posted

Welcome aboard matey...

Its a straight-six 2.5 M52 unit with a manifold restriction to earn its 523 badge !!

Posted

Welcome aboard matey...

Its a straight-six 2.5 M52 unit with a manifold restriction to earn its 523 badge !!

Can this restriction be removed Dabsy? And can you tell me why bmw done this?
Guest Mister Dabsy
Posted

RHD/LHD models were built to stock spec regardless (unless you purchased an "Individual"). Colour, running-gear, engines and interior were chosen at purchase... Looms, chassis and engines are stock from production line.

The straight-six came in 3 guises (4 upto 2002) - Their badge ! The restrictions were obtained in their manifolds, Throttle-bodies and ECU/DMA's (and obviously their corresponding sensors).

Straight-six config - 520, 523, 525, 528

Posted

Righto got ya, so ther than tge manifold the engine in my old E38 728i is the same as my E36 323i, could i put a 2.8 or a 2.5 manifold on my 323 then?

Guest Mister Dabsy
Posted

Rough idling is a direct result from either - erratic fuel pressure, failing crank/cam sensor(s), fouled up MAF/Throttle Body/Intake hoses or poor engine breathing... Oh and of course, engine timing/hi-tension electricals inc. plugs, leads etc.

Start with the basics and thoroughly clean the intake system (All of it) ;)

Posted

Thanks Dabsy, will try cleaning all the intake system at the weekend, your help is much appreciated, so do you think that uprating the intake manifold is possible then?

Posted

So i cleaned all of the the intake system over the weekend with no joy, i have taken the spark plugs out and they look like they could do with replacing so i am going to replace them and see if this makes a difference

So can anyone advise me on uprated manifold options?

Any help greatly appreciated

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