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-   -   Overnight Cold Start Rough Idle N62 4.8iS (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/109342-overnight-cold-start-rough-idle-n62-4-8is.html)

mr_robot 01-21-2019 05:52 PM

I wish I knew how to update my dme myself as I swear it’s a software issue more than my Intermediate levers due to it’s inconsistency. Every time I try to read a how to or video it just glosses over me lol

Sometimes my cel flashes after 2 min of driving when the cold start has already switched from max to min lift.


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mr_robot 01-22-2019 07:50 PM

2 days in a row no cold start misfire and these have been the coldest days ever.

The only change done recently was I switched from Castrol 0w-40 to Liqui Moly 5w-40.

amancuso 01-22-2019 08:00 PM

Quote:

Originally Posted by mr_robot (Post 1152865)
2 days in a row no cold start misfire and these have been the coldest days ever.

The only change done recently was I switched from Castrol 0w-40 to Liqui Moly 5w-40.

Same here. But I did get a false oil pressure warning on the dash.

mr_robot 01-22-2019 08:08 PM

Oh sorry forgot to mention I did change my oil pressure switch when doing the oil change as well as mine was leaking.

jsoto 01-22-2019 08:19 PM

For ur wiki. I was chasing a oil pressure & low oil on cluster and when all said and done - it wasn't the usual stuff. Aux fan was no good and somehow was trigger this on the cluster.

LVR 01-23-2019 10:40 AM

Quote:

Originally Posted by mr_robot (Post 1152865)
2 days in a row no cold start misfire and these have been the coldest days ever.

The only change done recently was I switched from Castrol 0w-40 to Liqui Moly 5w-40.

Not sure if this is of help, but in another thread regarding poss levers issue, with the symptoms being rough idle and hard start, when I asked for advice my ex BMW indi stated that the vanos solenoids with their small holes are quite sensitive to getting clogged up or poor oil quality and are his first point to check.

As they regulate timing it's possible that this is the problem?

It's apparently a DIY to pull em out (4) and give them a clean.

mr_robot 02-23-2019 05:20 PM

I will give vanos solenoids a try next.

Can I just unplug them and run the car for couple days to test? If they’re the culprit, unplugged should not cause a misfire correct?

I did new spark plugs with Iridium IX and idle and drivability was much improved but cold start random misfire with cyl 2, 4, 6, 8 was still there.

Again, not every cold start and intermittent days.

So today I tried swapping the coil plugs around to see if the misfire cylinders followed but it stayed the same at cyl 2, 4, 6, 8.

But again not always all four sometimes just 2, 4, 6 or 4&6 or just one, never consistent and really random.

AussieXer 02-24-2019 03:45 AM

I have been experimenting with the 4 Vanos solenoids. I have found that if I disconnect some of them the misfire and error codes (29CC, 29CD) go away (to be replaced by different codes telling me that the Vanos solenoids are disconnected, but no CEL)the car runs a lot better but there is slight hesitation on acceleration from lows revs (about 1500 revs).

LouInSD 11-04-2019 11:54 PM

Hey y'all, having the same issue. It got really bad about a week ago and I went and put the best fuel I could find in it and it ran much better. I'm hearing a rattling noise on the drivers side bank that accompanies the rough idle. I did put it on INPA and noticed that the cam position on the intake is pegged all the way to one side. I'm thinking that might explain the rattling that disappears when the idle clears up. I think I've got a dirty vanos solenoid. When I first bought this X5 it was having issues with misfires and it ran really bad. I popped the vanos solenoids out, cleaned them with some solvent, applied voltage to make sure they operated properly, installed fresh seals and it fired right up and ran like a factory fresh motor... For over a year now, then this issue started up recently. I'm going to pull the solenoids and clean them and see if that does the trick.

Let me know if any of you have any new updates to your situations.

Thanks

AussieXer 11-05-2019 01:12 AM

The symptoms that led me to experiment with the Vanos solenoids are documented in detail elsewhere but to summarise they were essentially a faltering when accelerating from low revs (eg about 1500), the CEL light coming which occasionally led to limp home mode. Rough idling was not really an issue at Australian temperatures (mostly between 10 and 20 degrees C). Accidentally I discovered that if I disconnected the inlet solenoid on the right hand side the car ran a lot better and did not falter. My local mechanic took the valve covers off the car and found that there was significant pitting on the eccentric shaft on right. He suggested that the reason that the car ran better with solenoid disconnected was that it essentially disabled the valvetronic system.
Currently the car starts well idles initially at about 1000 rpm then slows as you would expect and then for about 30 seconds runs roughly and then suddenly picks up and runs really smoothly from then on. I have been running the car like this for about 12 months and have even used it to pull a caravan for about 4000 kms on holiday. I have read other reports of owners disconnecting Vanos solenoids to correct running faults. Still thinking about replacing eccentric shafts but they are pretty pricey and I am not sure what I will gain.


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