.

Could it be a vanos solonoid clicking? You say it has a rough idle. Is something trying to adjust valve timing to idle correctly. Wrong signals ot bad solonoid or something?
 
What was the outcome with Iridium Rich ?

Did they have the car cold to look at ?

If you can hear a rattle around the vanos as said above it might very well be one of the solenoids getting sticky.
 
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Lee said:
What was the outcome with Iridium Rich ?

Did they have the car cold to look at ?

If you can hear a rattle around the vanos as said above it might very well be one of the solenoids getting sticky.
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I could feel the solenoid (top one) clicking today @Lee ..it’s very audible. Looks easy to get it off but is it at all serviceable/cleanable or is a new one needed ?
 
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AntStark said:
I could feel the solenoid (top one) clicking today @Lee ..it’s very audible. Looks easy to get it off but is it at all serviceable/cleanable or is a new one needed ?
Click to expand...

Best to replace, they fail internally.

Not sure on their cost. Ones easy to reach with a 32mm spanner the other needs a crows foot attachment.
 
Febi one on eBay for £46.50
Part 175323 ..says it fits 2.8 Z3
 
AntStark said:
Febi one on eBay for £46.50
Part 175323 ..says it The exhaust side solenoid is blisteringly hot after the car has been driven. Switched out the inlet side cam sensor but not the exhaust side.
Click to expand...
 
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Mine was rebuilt a few years ago and developed a ticking. It was the camshaft sensor failing. Replaced that (£22) and the noise went. This was last month and been fine since
 
bear2020 said:
Mine was rebuilt a few years ago and developed a ticking. It was the camshaft sensor failing. Replaced that (£22) and the noise went. This was last month and been fine since
Click to expand...
Sold
 
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I replaced both as the exhaust was only another £17 and thought whilst I was there might as well.
 
No issues with carb cleaner, might be worth taking it off and giving it a clean, just nuts n bolts.

It's strange as my dads 2.8Tu thats been parked up for a year is now doing this same thing, hunting and cutting out cold at idle, Once I drive it and get it all warm its fine.

P.S I would start doing things like removing the injectors from the car and laying them all in bottles to check ones not leaky.

Like this.
image.webp
 
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