P0505 fault. Idle Control System

[Rhyds]

Hi wise ones
I know virtually nothing about cars & engines!!! Be gentle with me please

My Z3 2.8 2000 (M54TUB28 I think) is cleaning up nicely.

Starts & runs. Won’t rev.
I’ve changed split hoses.
Replaced faulty MAF
Started & ran nicely cold but wouldn’t rev when warm.
Got the garage to plug it in & got a P0505 - Idle Control System fault code.
Took out the ICV & cleaned it, was a bit dirty but it was working
Replaced it all…. & now it’s worse. More air in system? Not sealed

I’m not convinced that I fitted it to the intake manifold (?) correctly.
It seemed to be a push fit. But my small brain is telling me that it should have been a pipe or at least have something to tighten.
Any insight would be helpful.
Thanks
Rhyd

 

[colb]

Seems you have already changed or cleaned the usual suspects. A smoke test would find any air leaks you may still have.
Real oem parts site shows your 2000 2.8 is a M52 engine version. Parts diagram for intake here, check the gaskets were seated correctly when you put it back on.

Intake manifold system Diagram for BMW Z3 E36 2.8 (2000) Catalog | RealOEM.com

BMW parts Z3 E36 2.8 Intake manifold system

www.realoem.com

 

[Rhyds]

Thanks for the help
M52? How can I tell the difference or tell for sure?
I’m going to re seat the ICV today.
I noticed the rubber grommet where the ICV connects to the manifold. I wonder if it’s worth changing that.
Real OEM Parts is in America? Any issues getting stuff sent to UK?
Thanks again

 

[Althulas]

Just Google the part number and you will come up with a few hits. Always worth checking your dealer as prices can surprise you. Be wary of eBay sellers as they usually take the micheal. If your doing a bulk order of items you can make savings from autodoc but takes a while to arrive from Germany.

 

[Nodzed]

Thanks for the help
M52? How can I tell the difference or tell for sure?
I’m going to re seat the ICV today.
I noticed the rubber grommet where the ICV connects to the manifold. I wonder if it’s worth changing that.
Real OEM Parts is in America? Any issues getting stuff sent to UK?
Thanks again

Real OEM is just a parts catalogue. Put your correct car details in (put the right build month / year as per your log book as things changed through production years) then you get the correct part numbers to search for or relay to BMW parts department.

 

[Rhyds]

I’ve been hunting through possible faults…
I’m thinking DISA valve maybe not working.
Online searching revealed a video showing how to test the valve works.

View: https://m.youtube.com/watch?v=so6xLmg1zno


I’ve run through his tests.
Vac good but the flap does not move when key turned to run position.
@colb @Nodzed Would you get a new DISA based on this OR try & get another one to check first?
Thanks

 

[Spannerman]

Have you solved this problem? I have exactly the same and struggling.....

 

[Rhyds]

Hi.
Short answer. No.

i have now replaced all my perished vacuum pipes, tried replacing the MAF, DiSA & the idle control valve…
It runs better since changing the pipes but nothing else has made any difference. I’ve given up tinkering & it’s going into the garage tomorrow for a smoke & compression test so we’ll see what that throws up

 

[colb]

Been chasing a bad idle on a Z3M smoke test revealed air leak from intake gaskets letting unmetered air in, new gaskets fitted smoke test then passed but idle still not right. Car wouldn't start but would if brake cleaner was sprayed into the inlet. Attention then turned to fuel delivery and accessed the fuel pump in the tank. Checked it was getting power when ignition turned on, it gets a momentarily power feed when ignition turned on to prime the system then full power when the starter is engaged. Pump removed and bench tested with 12volts and it was dead, motor seized. Awaiting replacement which hopefully restores running.

 

[Rhyds]

Hello again folks,
So… the Z3 has been to the garage (yes I gave up) they’ve sorted all the old hoses, replaced an ignition coil, throttle body & MAF. Smoke tested it all.
she starts & runs beautifully
But she won’t rev past 1500
They’re stumped! They think electrical
Any suggestions please? All this sun & no Z3 is driving me mad!