E85 3.0si rough idle / “thwacking” noise?

georgekitchen7 · Post by **georgekitchen7** » Thu Sep 05, 2019 10:53 am

A local garage serviced it, when owned by previous owner. I’ll change the oil myself with LL04 spec before next summer when I get it out of the garage and take it off SORN. Castrol Magnatec can be bought LL04 I think?

JamieZ4C · Post by **JamieZ4C** » Thu Sep 05, 2019 11:30 am

Indeed it can and it's currently on special offer at Halfords

Edit... Scrap that, I just checked their website and it's back up to normal price

georgekitchen7 · Post by **georgekitchen7** » Thu Sep 05, 2019 12:26 pm

Thanks Jamie! (I actually got 4L of 50% off Magnatec from Halfords when it was on offer the other day, as Z needed +1L top up) - guess mixing oil types could cause a noise?

skelters · Post by **skelters** » Thu Sep 05, 2019 2:49 pm

Have you had the codes read to see if there's anything that might be causing an issue?

JamieZ4C · Post by **JamieZ4C** » Thu Sep 05, 2019 3:01 pm

Re mixing oil, I don't think it's recommended, although I haven't a clue if it would cause your symptoms.

I say give it an oil and filter change and take it out for a good long blast (preferably on the most fun roads you know - it's what owning a zed is all about

)

georgekitchen7 · Post by **georgekitchen7** » Thu Sep 05, 2019 3:02 pm

Hi skelters,

Not yet, as don’t have a code reader and don’t want to go to the Stealership! That said, I’ll try and find a local BMW specialist if it continues.

Cheers,

George

skelters · Post by **skelters** » Thu Sep 05, 2019 3:58 pm

There's a thread on the forum for Who Has Carly.

Someone close will be able to check for any error codes.

Where are you?

georgekitchen7 · Post by **georgekitchen7** » Thu Sep 05, 2019 4:37 pm

Hi Skelters,

That would be amazing! Bromsgrove, so Birmingham-way?

wonkydonkey · Post by **wonkydonkey** » Thu Sep 05, 2019 8:58 pm

Guys, don't forget that Halfords do price matching. I bought three 5 litre bottles of Castrol Edge to do my Z4 and the Audi and saved something like £40 by price matching an online shop I've used before. It'll knock the socks of most special offers!

skelters · Post by **skelters** » Fri Sep 06, 2019 1:41 pm

Who has Carly thread.....

viewtopic.php?f=2&t=97818

Mike6 · Post by **Mike6** » Mon Sep 09, 2019 6:23 pm

Does it make that noise from start when cold. I ask because I have just had a mechanic out to my Ford Focus (day car) which is making a similar noise. Only does it when engine gets hot. Mechanic says its the typical noise of a timing chain tensioner on the way out. This can effect engine timing and cause rough idling as well as that noise.

georgekitchen7 · Post by **georgekitchen7** » Mon Sep 09, 2019 6:43 pm

Hi Mike, thanks for that, much appreciated. Does it all of the time, but seems to have quietened down a bit now after an exuberant run out on Sat eve in the sun

Will keep my ear out next time it starts cold and also after a good run when hot

Natishin · Post by **Natishin** » Wed Sep 11, 2019 12:56 am

As per migizi....check your Diza valve.

Post by **srhutch** » Wed Sep 11, 2019 7:00 am

skelters wrote: ↑Thu Sep 05, 2019 10:21 am Here's the worst, worst case....

viewtopic.php?t=10937

What's the mileage on the car?

Which oil is in the car?

As you can see from that happened from 2k on the clock and the car was doing 2 x 25 mile trips per day or every other day with no short journeys, which throws a lot of the usual causes such as short journey and lack off use out of the window.

OP’s sounds normal though, just injector noise. Hearing sound on video though can be difficult.

georgekitchen7 · Post by **georgekitchen7** » Wed Sep 11, 2019 10:29 am

Thanks guys. Re. DISA valve - didn’t the N52 (3.0si) get a revised DISA that is meant not to have the same issues as on the M54 (pre-2006) Z’s?

Cheers,

George

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