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-   -   X won't idel after replacing valve stem seals - receiving misfire codes. (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/110360-x-wont-idel-after-replacing-valve-stem-seals-receiving-misfire-codes.html)

Purplefade 06-01-2019 01:48 PM

X won't idel after replacing valve stem seals - receiving misfire codes.
 
Hi guys – I need the power of the forum brain trust!

I just completed installing new valve stem seals in my 05 X5 4.4i, which went pretty well, but upon completion I can’t get the car to idle right, I continue to have misfire codes.

Codes I have:
2A89 – DME: Exhaust Vanos 2 (I was able to resolve this code by resetting the adaptations for the valvetronic motors a second time – it is now gone, but I wanted you guys to have the history.)
29CC – DME: Combustion misfires several cylinders
29D2 – DME: Combustion misfires cylinder 6
29CF – DME: Combustion misfires cylinder 3 (This one is totally intermittent, it showed up on first start, went away right away and then came back the next day but went away again as fast as it appeared.)

What I have done:
1) Verified voltage at the Vanos plugs – 12.44v batt side and 3.49v DME side = plugs seem to be working
2) Swapped Vanos – exhaust for intake, intake for exhaust = no change, issue stayed with exhaust vanos 2
3) Swapped bank 1 exhaust CPS for bank 2 exhaust CPS = no change
4) Swapped coils with cylinder 5 & cylinder 6 = no change
5) Installed a new plug in cylinder 6 = no change
6) Swapped plugs from cylinder 5 & cylinder 6 = no change
7) Reset valvetronic motors (again) = no change, but it did clear my exhaust vanos code which has remained gone through all recent testing
8) Cleared adaptations (again) = no change
9) Climbed all over the valve covers and spark plug tubes looking for vacuum leaks or oil seepage – everything seems solid.

Car will start and almost immediately surges up to about 2000 RPM then drops to 400/500 RPM, almost dies and then catches this off idle slow, rough idle that hangs around 600 or so RPM. There is no valve clatter, no tick, no ping, nothing, both valve covers are as quiet as a church mouse.

I have gone back through everything that I have done, verified all plug-in connections and even reset the majority of them just to be sure. It seems like if I start the car cold I just get the codes and rough idle, after messing with it for a few cycles l I get codes, rough idle and it will start to give me a VERY SOFT “pop”, “pop”, “pop” that I can barely hear through the air intake tube – I have the MAF and air intake pipe connected but have the actual air filter box off.

Battery is 12.7 volts
Battery with car running is 14.2 volts
Gas is new (considering the “old” gas factor I syphoned the tank down and filled it with fresh fuel, I then clamped a 1/2 hose to my fuel hardline and allowed the pump to run for a handful of seconds to push fresh fuel to the engine. (anal retentive I know…but I’m stumped))

NOTE – unplugging the MAF it idles “better”, marginally, but I still have the misfire codes.

Where do I go with this thing next?



EDIT - 4x4 light just came on as well.

X5only 06-01-2019 04:20 PM

You've confirmed the sensor connections on top of the engine are not swapped, right?

See this post. https://xoutpost.com/bmw-sav-forums/...isfires-3.html

Purplefade 06-01-2019 04:28 PM

Quote:

Originally Posted by X5only (Post 1163328)
You've confirmed the sensor connections on top of the engine are not swapped, right?

See this post. https://xoutpost.com/bmw-sav-forums/...isfires-3.html




CPS sensors? I couldn't mix mine up, the harness is designed with a long lead for the outside/lower sensor and a short lead for the inside/upper sensor, they aren't all like that?


That said, I ran to the garage to verify and yep, they are definitely long and short, wouldn't even be possible to mix them up, the top sensor wouldn't reach the lower sensor, pigtail is too short.


We are talking CPS, right? :-)

Purplefade 06-01-2019 06:24 PM

UPDATE:


- Being at whits end with this thing I decided to double check all of my reassembly work, so.. I took a rag, sprayed it with brake clean and cleaned and re-seated every connection that I touched during the VSS process - CPS, vanos, eccentric sensors, coil plugs, valvetronic motors, you name it, ALL of them and...


- To my amazement - it runs! - Starts and idles smooth, transitions to low idle without a hiccup and seems to be running nicely but for one small thing - it has no power. Blip the throttle and the car responds with nothing for the first second or so and them lamely revs up ever so slightly.


- Shut it off and restarted it again and the same thing, starts perfectly, catches idle, idles smooth and transitions to low idle without an issue - but I did get two new codes on that start:



2B62 DME: Camshaft sensor, intake
2B65 DME: Camshaft sensor 2, exhaust


Do I have these two sensors backwards possibly? Doesn't seem to be any issue per say but for the lack of power and delayed throttle response, if it only had to idle you'd think it was perfect??

X5only 06-01-2019 06:46 PM

Go through that thread link above. Your X5 is the same year and model as mine. It's possible the sensors are mixed up, not the connections. Verify the positions by part number, especially on the driver side. You're getting there :thumbup:

X5M-ISH 06-01-2019 07:52 PM

Seeing this thread made my automotive heart sink in that first post of yours. I am super stoked you resolved most of your issues and for that matter have everything back together. I have been watching your relevant threads closely.

Purplefade 06-01-2019 08:07 PM

Well... short lived party...


I swapped the CPS sensors in bank 1 (intake to exhaust\exhaust to intake) and now my two camshaft sensor codes are gone and I am back to "2A89 DME Exhaust VANOS 2" and have my surging idle back.



2B62 DME: Camshaft sensor, intake - GONE NOW
2B65 DME: Camshaft sensor 2, exhaust - GONE NOW


2A89 DME Exhaust VANOS 2 - CAME BACK, with surging idle


Please check my sanity on this - exhaust vanos 2 is the top, or outside most, vanos solenoid on the left hand side (driver side\lhd) of the engine, is that correct?

Purplefade 06-01-2019 08:13 PM

Quote:

Originally Posted by X5M-ISH (Post 1163333)
Seeing this thread made my automotive heart sink in that first post of yours. I am super stoked you resolved most of your issues and for that matter have everything back together. I have been watching your relevant threads closely.


Thanks brother! - I know when I got it all back together and turned the key for the first time I really expected it to fire up and run... nope... was a killer!


And then I went back through everything before jumping on here, just to double check myself, and really found nothing of huge significance. I had clipped a coil ground (center cap nut on valve cover) because the bolt was frozen, but I did a bang up solder and new eyelet job on that sucker! I also found bare copper exposed on my bank 2 exhaust vanos harness, too close to the connector to fix, but thankfully the connector tested good and I was able to clean that wire up and seal the jacket.


Cleared the codes and held my breath... and it still didn't run.


Then - the clouds parted and the sucker ran like a top for 7 minutes... and now I am back to a VANOS code and poor idle.


I'm sure we'll eventually nail it down, but wow, this kind of stinks.


Two steps forward, one step back... but getting there !ouch:








You have a VSS job in your future?

X5M-ISH 06-01-2019 08:20 PM

You didn’t adjust with (or inadvertently touch) the timing sequence anywhere on the front of the engine? The timing anywhere being off by one tooth will cause a sporsdic idle and the dme will try like mad to advance or retard via the VANOS any respective cams to make up for this problem.

X5only 06-01-2019 08:36 PM

Good point X5M-ISH. Purplefade, you did verify the engine timing before putting back the valve covers, right?


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