What did you do to / for your E53 today??

[andrewwynn]

What does the foxwell show the idle speed is set to? And can you maybe force it down?

I think DME pulls rpm from CKP and if that's faulty care won't even start.

[Bdc101]

I don't know what the CKP module is, but whenever I click on "adjust idle speed" it says "There are faults in the module preventing you from doing this" or something along those lines. Is there a place to see where the idle speed should be?

[BimmerBreaker]

Got mine moved out of the side yard to list it for sale. Never wanted to sell it but not driving it currently and have limited garage space. Not sure what it's even worth, 06 4.8is with just under 220,000 miles and the Aerodynamic body kit. Still a great condition car overall but needs a few things here and there (window regulator, engine mounts, windshield replaced, a good detail, sunroof shade fabric reupholstered). I'm asking $4500 right now but at this point would let it go for any reasonable offer. Been a rock solid vehicle for me and sad to see it to but my time to work on it is a lot more limited these days than it was when I bought it. Have a work truck now too, and I drive that instead for most of my errands or my M roadster for date nights with the wife...

Originally Posted by Bdc101

I got the missing parts and put my E53 back together after replacing the idle control valve, MAF, DISA and the intake boot. All brand new parts (VEMO, VDO and Rein).



I had to take it apart and put it back together after it idled high. After I put it together the second time it idles well at about 950rpm, but it throws "idle speed plausibility" codes instantly every time. It doesn't illuminate on the dash, but the Foxwell picks it up.





I logged data on the foxwell and the idle speed is pretty stable at about 950rpm. When I active-test it, it seems to work correctly (the test is to increase idle speed to 1500 rpm which it does). When I turn the AC on it goes down to about 850 rpm. However it seems like it is pretty solid other than that.



I haven't driven it much, only around the driveway and started it three or four times and idled it for a while. I'll test drive it later today. Anyone else know if this is a symptom of something else broken?

First step is to clear adaptions.

[BimmerBreaker]

Originally Posted by Bdc101

I don't know what the CKP module is, but whenever I click on "adjust idle speed" it says "There are faults in the module preventing you from doing this" or something along those lines. Is there a place to see where the idle speed should be?

CKP is the crank sensor. Has nothing to do with your issue at all

I don't use foxwells so can't speak for where it'd be on there but you can not set idle below normal value. In INPA it shows idle request and idle actual in the first analog screen.

[Bdc101]

Originally Posted by BimmerBreaker

First step is to clear adaptions.

Yep, did that already. I'm gonna go drive it and see what Foxwell says after. Maybe it will throw more codes after a drive cycle or two.

[andrewwynn]

Originally Posted by Bdc101

I don't know what the CKP module is, but whenever I click on "adjust idle speed" it says "There are faults in the module preventing you from doing this" or something along those lines. Is there a place to see where the idle speed should be?

CPS taken for cam position sensor. CKP is crank Kosition Pensor ?

Crank Position Sensor.

What errors do you have?


Sent from my iPhone using Tapatalk Pro

[Bdc101]

No codes, andrew, except "Plausibility, idle speed (air leakage)" which comes back if I reset it. I took it out for a drive and stopped and started it several times. The "Plausibility, idle speed" came back several times (but no check engine light). On the return trip I gunned it in 1st and 2nd and after that the check engine light came on with an idle speed OBDII code, and the idle started to surge between 1,200 and 1,500 repeatedly. After stopping and starting the idle was stable but then after I blipped the throttle once it started surging again. It never died or even threatened to though.

I opened the hood and felt around for leaks but couldn't find anything. I pulled the vacuum hoses off the intake elbow (the one attached to the throttle body) but no change in the surging. I unplugged the MAF and the idle went to 700 rpm immediately and stayed there. No codes during this time of surging except when I unplugged the MAF.

About to lose my sh** with this car. I think I'll go try to put the old MAF on since that's easy and I never had any actual evidence that it failed.

[Bdc101]

Swapping MAF makes no difference... unplugging it doesn't seem to make a difference now either. Not throwing any codes in the DME right now while it has the surging idle from 1,200 to 1,500 rpm. It surges like this for a few minutes and then settles down around 1,200 but as soon as you blip the throttle it goes back to surging. What am I missing here? DISA, ISCV, MAF, all associated gaskets are brand new, I removed the throttle body itself to inspect it, replaced its gasket, I put all of that stuff back together twice and triple checked every connection. I replaced the vacuum caps on the back of the manifold. I've visually inspected all of the vacuum lines that I can access but I can't imagine that any one vacuum line could be causing this kind of problem anyways.



Crazy that when I pull the trigger on the parts cannon to solve a minor problem, I end up with even more and bigger problems.

[BimmerBreaker]

It sounds like you have a vacuum leak. One of the new components you installed is likely not seated properly. Id guess ICV based on the code.

To test for vacuum leaks you need a smoke tester with pressurized air. Just "feeling around" for leaks wont do anything. You could also just re-check all the recent components you installed and re-seat, and verify the ICV is installed the correct direction.

[Bdc101]

Yep - stepping back from the problem it is definitely the symptoms of a vacuum leak.



I'm gonna take it apart again tomorrow and check the ISCV especially. The surging in idle seems to me that it can only be cause by a vacuum leak DOWNSTREAM of the ISCV and throttle body. Upstream it's just getting unmetered air (throwing off the AFR but correctable with O2 feedback), but downstream it's both unmetered and unrestricted. I'm pretty sure I got it all back together right but there being no hose clamp around the ISCV on the downstream side, and the general impossibility of seeing any of that area, means I could have missed it.



To cool off I removed the extremely dark tint from one of my new E70's windows. It's so dark you can hardly see out of it at night. And I fixed my lawnmower. So I didn't get nothing done today.