Z3 2.8 won’t rev 🤷‍♂️

Rhyds

Rhyds

Regular Member
Joined
May 11, 2024
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Rhyds said:
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 😞
They’re stumped! They think electrical 🤷‍♂️
Any suggestions please? All this sun & no Z3 is driving me mad!
Click to expand...
 
DomiMik said:
Can you rev it by pressing the throttle in the engine bay?
Click to expand...
👎🏻 nope.
it seems like a lack of fuel to
My Mind but the mechanics are saying it’s something else .
Just wondering if anyone else had this problem?
 
No codes?
 
What model of zed 3 is it and what year.

Does the car start fine .

When you press the throttle pedal what exactly happens does it rev off idle at all.
Stephen
 
Stevo7682 said:
What model of zed 3 is it and what year.

Does the car start fine .

When you press the throttle pedal what exactly happens does it rev off idle at all.
Stephen
Click to expand...
Thanks Stevo.
2000 Z3 2.8
It starts on the button & idles lovely since changing & replacing stuff 😬
When depressing the accelerator It starts to pickup then chokes & splutters.
Take the foot off & it recovers to idle beautifully
 
I've had this, cat fell apart inside and blocked exhaust. If you bang the cat with your hand you might hear it rattle. Failing that, take back pipe off and look into the cat. Bust the bits up in the cat and rake all the bits out.
 
Easy fix!

The throttle disc has jammed in the throttle body. Over time, the steel disc wears a small ridge in the alloy housing and eventually it sticks. The throttle pedal feels normal and you can see the mechanism on the side moving. But the twin vanos 2.0 and 2.8 have a throttle body with the ASC motor built in and the idea is that the motor can shut the throttle disc when it detects wheelspin.

Remove the intake bellows so you can see the throttle body and I bet you the disc is stuck closed. A good jab on the disc will open it - use some 800 grit wet and dry with WD40 and polish the ridge out so the disc opens and closes. You can do it on the car although removing it makes a better job.
 
Thanks folks
I’ll check all that with the garage.
Mechanic did say he’d disconnected the exhaust so didn’t think it was broken cat (?)
Also changed the throttle body but hat appears not to have fixed anything.

This is a screenshot of the OBD codes.
 

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Update
After a lot of frustration with the mechanics… I met a man who can.. with electronics. 2 burnt out capacitors (or something) & some new tracking on a circuit board and she revs! No Engine Management lights at all!!!
i can’t seem to add the video where he explains what he’s done, fascinating stuff though.
Now to find out what else she needs for an MOT
 
looks like it's been a good weekend for dying 2.8's!
 
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