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A few niggly niggles!

Discuss problems you have had or are having with your Z4
Johnnyz4coupe
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A few niggly niggles!

Post by Johnnyz4coupe » Wed Mar 21, 2018 12:22 am

ph001 wrote: Tue Mar 20, 2018 2:01 pm
Given the very noticeable flat spot and growly sound, vanos is more likely.

There are 2 off DISA valves on the 3.0Si. They don't fail that commonly like on the M54 cars but one is relatively easy to get to and it would be worthwhile removing it to see if there is a lot of oil in your intake. If there is then the CCV is defo stuffed. The 2nd DISA valve requires the removal of the inlet manifold to inspect. If they fail, it can give issues similar to vanos (i.e. poor idling and flat spots).

When I took the IACV thing off the other month, I did notice oil in the manifold area. My car does seem to smoke a little all the time. Nothing horrendous but I have noticed it.

Also my oil consumption seemed to increase before I topped it back up, but I do very few miles in the car now.
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ph001
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A few niggly niggles!

Post by ph001 » Wed Mar 21, 2018 10:32 am

Johnnyz4coupe wrote: Wed Mar 21, 2018 12:22 am When I took the IACV thing off the other month, I did notice oil in the manifold area. My car does seem to smoke a little all the time. Nothing horrendous but I have noticed it.

Also my oil consumption seemed to increase before I topped it back up, but I do very few miles in the car now.
I think the crank case ventilation should be high on your priority list in that case. If you do very few miles in the car, they can be susceptible to moisture buildup in the oil which makes it go sludgy and bungs everything up. It would probably benefit to a good hour long B road blast to try to get the oil temp as high as possible and evaporate all the moisture out.
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Chris1981
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A few niggly niggles!

Post by Chris1981 » Wed Mar 21, 2018 2:49 pm

A blocked CCV system won't account for your performance issues, but if you've got a significant amount of oil in your inlet and high oil consumption then it definitely sounds like it needs changing. I've changed CCVs on both my car and another forum member, we both have the lumpy idle issue but a new CCV system did not cure it. You can test your CCV by blowing through the pipe exiting the rear of the rocker cover into the CCV, if you hear gurgling oil it's clear, if not then it's blocked and you'll be blowing air/oil straight into the intake.

Not too sure on what determines the fitment of new/old CCV systems, but like PH001 mentioned if you have a silver engine cover it's likely yours will be external and can be replaced. Mine is a 2008 coupe and I have the external CCV, I've seen 2006 models that had the CCV integral to the cam cover.... of course mine may be an earlier build and registered late or had a replacement engine at some point in it's life!?

I've had a lumpy idle since buying my coupe, only appears when warm and usually when I'm using light throttle such as car parks or in traffic... blipping the throttle levels it out, does this sound similar to yours? My flat spot sounds exactly the same as yours but was a more recent thing and led to me changing coils, DISA and MAF

Vanos Solenoids - Had an error code and EML, no improvement on lumpy idle but helped with power delivery.
CCV system - reduced oil consumption, lumpy idle still exist.
New Coils - slight improvement in throttle response but nothing else. Mine were original at 95k so no harm in changing them i thought!
Large DISA valve - I did eventually get an error code for this but mine was clearly broken, if it can be moved by hand then it's shagged so quite easy to check, at £250 from a dealer you'd want to be sure this is the issue before changing! This removed flat spots at low RPM only but not the lumpy idle.
MAF sensor - after cleaning mine several times and getting slight improvements I eventually bit the bullet and bought a new one, I have not had the lumpy idle since, flat spots are pretty much non existent now and performance dramatically improved.

I tested my MAF by doing the same journey with it plugged in then unplugged the next day to see if i could feel any difference, the flat spots improved when unplugged so decided to change it. You will get an EML by driving with the MAF unplugged but the car drives fine but fuel economy will be horrendous, you'd need to be able to clear the codes after that sort of test though!

This is only my experience so cannot guarantee it will resolve your issues but wanted to share with you before you go throwing too many parts at it. I'd be happy to put my MAF into yours to test if it resolves your problems before you go buying a new one but i'm based in Rugby so would be a bit of a journey for you!? I managed to get a genuine part from eBay for £150 which is far cheaper than I can get from a dealer even with my discount!
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A few niggly niggles!

Post by AveZ4coop » Wed Mar 21, 2018 5:14 pm

^^^Sounds like good advice to me? :D
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A few niggly niggles!

Post by Johnnyz4coupe » Wed Mar 21, 2018 9:37 pm

Thank you

It’s all brilliant advice. I just don’t know where to start.

I’ve ordered six brand new Bosch coils that should turn up tomorrow.

Once I’ve fitted them, I will take it out and see. Then the next thing I guess is the ccv.

All I can do is take it all apart on the weekend and show some pics of what I’m seeing so you guys can advise.

I’ve cleaned the maf a few times now. But like you guys have said, try it with it disconnected.
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A few niggly niggles!

Post by Johnnyz4coupe » Wed Mar 21, 2018 9:38 pm

Oh, and the cars covered 82k so far
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A few niggly niggles!

Post by Johnnyz4coupe » Sat Mar 24, 2018 8:03 pm

So still researching the running issue. :tumbleweed:

How about the ccv?

Would this be the kit to get?

https://www.turnermotorsport.com/p-3382 ... si/?pdk=BQ

Is a PCV the same thing? It's just that I've read that newer N52's have something on the cylinder head that needs replacing while older cars have it under the intake manifold.

Remember, i am not that clever on the mechanics of this car!! :headbang:
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A few niggly niggles!

Post by Chris1981 » Sun Mar 25, 2018 12:40 pm

Yep that's the right kit... double check yours is external first though, if you have the metal valve cover it's external black plastic is built in! Post a pic of your engine if you're unsure, plenty on here will be able to confirm for you :thumbsup:
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A few niggly niggles!

Post by Johnnyz4coupe » Sun Mar 25, 2018 3:14 pm

I’ve got the car back and have taken some pics
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A few niggly niggles!

Post by Johnnyz4coupe » Sun Mar 25, 2018 3:33 pm

Can I buy this and replace the hoses rather than spending £400 on a new valve cover and gaskets?

https://rover.ebay.com/rover/0/0/0?mpre ... 2465293893
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A few niggly niggles!

Post by Chris1981 » Sun Mar 25, 2018 4:10 pm

First kit definitely isn't for you then as you've got the black plastic cover... pipes and ccv outlet do have a lot of gunk in them so need changing or removing and cleaning! Don't know anything about the ccv system on that one I'm afraid but the link you added implies you can service the ccv so might be worth a shot!? Hopefully someone else on here has experience of that particular ccv so can give a clearer indication of next steps?
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A few niggly niggles!

Post by Johnnyz4coupe » Sun Mar 25, 2018 5:27 pm

Thank you Chris :thumbsup:
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A few niggly niggles!

Post by Johnnyz4coupe » Mon Mar 26, 2018 3:06 pm

Anyone??
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A few niggly niggles!

Post by Johnnyz4coupe » Wed Mar 28, 2018 6:45 pm

I’ve just done a pressure check on the ccv and it’s holding pressure perfectly.

So, PLEASE can someone advise me of the pipes I need for my car that will need to be changed as per the manky pipe pics earlier in this thread.

Thanks
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A few niggly niggles!

Post by rally-chris » Wed Mar 28, 2018 6:53 pm

08 Z4 3.0si Sport Coupe in Montego Blue

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