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Discussion Starter #1
The flap is not working on my 3.6.

Ive changed the solenoid from a car that it was working on.....no difference.

Changed the actual thing that open the flap

Tried another ECU aswell!

Still no joy!

Any ideas?
 

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I had the same problem some time ago. You probably have to change all the vacuum rubber hoses that are involved. Buy a bit more than 1 meter of the hose and cut copies based on the old ones. Do remeber to also change the last bit on the plastic hose that goes by the ignition distributor and down to the exhaust pump.
I think you will end up with 7 or 8 short hoses that you need to cut and replace.

After that you should get it to work.

Good Luck :)
 

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Discussion Starter #3
Does this mean I have to remove in the inlet manifold itself? There does not seem to be alot of room, changing the solenoid itself was a finger flexing task.

Thanks for your reply and help.

Sal
 

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Discussion Starter #5
But it does self test on ignition No 2........or not? The other M5 self tests.


Hence why I assumed it was not working.

Only other ways are to look whilst on dyno or remove bonnet and go for a drive!.....removing bonnet idea not so good I think.:3:
 

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Discussion Starter #7
Or maybe I can get a camera in there with a very bright light?

Anyone got a camera they want to lend me? Cumon, help a bloke out, let me use your £1000 sony camera with Karl Ziess lense so I can see if my flap works.

Promise I wont melt it!:cool2:
 

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Cyrus:

Take a look at this resonance flap test procedure from the E34 M5 FAQ:

E34 M5 FAQ: Resonance Flap Test Procedure

Then if you need to rebuild the resonance flap let me know, as a friend of mine locally here in the Bay Area (Jason Weaver) had written a great step by step procedure after rebuilding the RF on his '91 AW M5. I thought the draft version of this was also uploaded to the FAQ as well but I did not se it when quickly glancing through the contents there now.

BTW, Just what else did you have planned for that digital camera you were hoping to borrow. Hmmm... ;-)

Hope this helps.

Regards,

Ken Little
Bay Area M5's

 

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FYI

The resonance flap will NOT work while revving the car on idle. There is no self-test on ignition either.

And it works perfectly on mine...
 

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Are you talking about the valve on the top right side of the inlet manifold with the bolt that controls the amount of travel that you can move with your finger?

All you have to do to test it is put a blob of grease on the bolt then drive it round the block, if it is working then the grease will be on the flap mechanism too.

No need for cameras, rolling roads or trained gerbils with minature miners helmets :3:
 

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London Mike said:
Are you talking about the valve on the top right side of the inlet manifold with the bolt that controls the amount of travel that you can move with your finger?

All you have to do to test it is put a blob of grease on the bolt then drive it round the block, if it is working then the grease will be on the flap mechanism too.

No need for cameras, rolling roads or trained gerbils with minature miners helmets :3:
hiha
hiha

That was a good one....
 

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You don't have to remove the intake manifold, just the plenum/intake. Mine was hooked up wrong after my rebuild and wasn't operating. While we were down there we replaced some vacum lines.

If you know someone with a vacum test gauge you can hook that up to find out if vacum really is the problem. On start up it cycles through like everyone says.
 

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London Mike said:
As Pepsmeister said, the E34 M5 doesn't self-test.
Mike,

You have a 3.8? My 3.6 does cycle for sure and it really made a difference when we got it working in terms of low end power and smoothness.
 

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KKelly said:
Mike,

You have a 3.8? My 3.6 does cycle for sure and it really made a difference when we got it working in terms of low end power and smoothness.
Yup, I have a '95 3.8, it doesn't cycle (and I don't see how it could as it is vacuum driven) and it passes the 'blob of grease' test. It also drives fine with no huge holes in the power curve.
 

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London Mike said:
Yup, I have a '95 3.8, it doesn't cycle (and I dion't see how it could as it is vacuum driven) and it passes the 'blob of grease' test. It also drives fine with no huge holes in the power curve.
Blob of grease test. I need to remember that one.

I don't know why the 3.6 does but it does. Really, believe me. I don't want to have to break out the video camera but I will if need be. :D

Actually, I don't want anyone to see how dirty my engine is.
 

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I don't DOUBT you, I just don't see how it can as it isn't electrically driven. We are talking about the same part here, aren't we? Standing on the right side on the car it's on top of the inlet manifold with the vac line to it, you can move the flap arm forward and back with your finger. That one?
 
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