M54 intake swap gone wrong.

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AdyDurn
Joined: Wed 22 Jan, 2014 16:13
Posts: 16

  Z3 roadster 2.0

M54 intake swap gone wrong.

Post by AdyDurn » Sat 09 Sep, 2017 20:16

Hi guys, was really hoping for this post to be a success story and a list of the great changes I've managed with the car.

So, I've taken the old 2.0 m52 intake out and replaced with the m54 2.5 intake. Connected everything up and got in and fired her up.

I f*cked up.

She will idle, just, but the second I think of touching the accelerator it feels like the fuel is suddenly cut.

I suspect I've either missed a sensor cable (although I'm sure there's only the MAF unaccounted for). Does anybody have a wiring diagram or picture for the assembly under the throttle?

Many thanks in advance.

Ady

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Devon Z
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Joined: Thu 20 Nov, 2003 21:39
Posts: 650

  Z3 roadster 2.0
Location: Brixham, Devon

Re: M54 intake swap gone wrong.

Post by Devon Z » Sun 10 Sep, 2017 00:19

Sorry to hear your having trouble, sounds like something isn't conected? You need to get back in there and check all your conections, do you remember reconnecting the round plug to the thottle body? If everything is conected correctly then you may have a severe air leak somewhere? Throttle adaptor, thottle body, intake hoses etc just go back over it will be something simple.

Steve
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AdyDurn
Joined: Wed 22 Jan, 2014 16:13
Posts: 16

  Z3 roadster 2.0

Re: M54 intake swap gone wrong.

Post by AdyDurn » Sun 10 Sep, 2017 01:09

A vac hose perished and my fiddling breaking it off perhaps?

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Devon Z
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Joined: Thu 20 Nov, 2003 21:39
Posts: 650

  Z3 roadster 2.0
Location: Brixham, Devon

Re: M54 intake swap gone wrong.

Post by Devon Z » Sun 10 Sep, 2017 01:26

AdyDurn wrote:
Sun 10 Sep, 2017 01:09
A vac hose perished and my fiddling breaking it off perhaps?

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Could be? There's three vac hose conections at the back of the manifold (bulkhead end) 2 small ones and a large one which should have a rubber cap on it? this perishes, the one on my manifold and the 2.5 one I got were perished. Both the small ones should have caps on the M54 manifold but have pipes fitted to them on from the M52.
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AdyDurn
Joined: Wed 22 Jan, 2014 16:13
Posts: 16

  Z3 roadster 2.0

Re: M54 intake swap gone wrong.

Post by AdyDurn » Sun 10 Sep, 2017 01:33

Yes, distinctly remember removing the cap and fitting the pipe. Was in pretty had shape. Might have to be the first stop

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AdyDurn
Joined: Wed 22 Jan, 2014 16:13
Posts: 16

  Z3 roadster 2.0

Re: M54 intake swap gone wrong.

Post by AdyDurn » Sun 10 Sep, 2017 17:08

Turns out a vac hose going to a vacuum item (direct translation from German and no English on it) had pulled loose.

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Devon Z
Z Register member
Joined: Thu 20 Nov, 2003 21:39
Posts: 650

  Z3 roadster 2.0
Location: Brixham, Devon

Re: M54 intake swap gone wrong.

Post by Devon Z » Sun 10 Sep, 2017 20:33

AdyDurn wrote:
Sun 10 Sep, 2017 17:08
Turns out a vac hose going to a vacuum item (direct translation from German and no English on it) had pulled loose.

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Glad you got it sorted.
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AdyDurn
Joined: Wed 22 Jan, 2014 16:13
Posts: 16

  Z3 roadster 2.0

Re: M54 intake swap gone wrong.

Post by AdyDurn » Mon 11 Sep, 2017 00:58

Yes, thanks for pointing me that direction Steve.

Wow, what a difference, it seriously pulls now, and sounds a lot smoother.

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sebring
Joined: Thu 12 Dec, 2013 12:45
Posts: 39

  Z3 roadster 1.9

Re: M54 intake swap gone wrong.

Post by sebring » Mon 11 Sep, 2017 09:18

have you got comparison pics between the 2 manifolds?

I'm interested in the size of the inlet on the head, and the manifold shapes

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Devon Z
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Joined: Thu 20 Nov, 2003 21:39
Posts: 650

  Z3 roadster 2.0
Location: Brixham, Devon

Re: M54 intake swap gone wrong.

Post by Devon Z » Mon 11 Sep, 2017 09:37

AdyDurn wrote:
Mon 11 Sep, 2017 00:58
Yes, thanks for pointing me that direction Steve.

Wow, what a difference, it seriously pulls now, and sounds a lot smoother.

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It's great isn't it? Really frees up the engine to rev better.
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Devon Z
Z Register member
Joined: Thu 20 Nov, 2003 21:39
Posts: 650

  Z3 roadster 2.0
Location: Brixham, Devon

Re: M54 intake swap gone wrong.

Post by Devon Z » Mon 11 Sep, 2017 09:41

sebring wrote:
Mon 11 Sep, 2017 09:18
have you got comparison pics between the 2 manifolds?

I'm interested in the size of the inlet on the head, and the manifold shapes
Check out this, shows the difference in port size/shape but the main part of the manifold and the DISA valve are 10mm larger.
https://zroadster.org/threads/fitting-a ... old.19042/
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AdyDurn
Joined: Wed 22 Jan, 2014 16:13
Posts: 16

  Z3 roadster 2.0

Re: M54 intake swap gone wrong.

Post by AdyDurn » Mon 11 Sep, 2017 16:53


sebring wrote:have you got comparison pics between the 2 manifolds?

I'm interested in the size of the inlet on the head, and the manifold shapes
I have a few pics that I'll push up to Imgur tonight. The new intake is significantly bigger, my conical filter is up against ther the wheel arch now, before there was more space


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