Misfires on Cylinder 4,5,6 - Page 2 - Bimmerfest - BMW Forums



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  #26  
Old 10-20-2019, 09:06 PM
gbalthrop gbalthrop is offline
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Quote:
Originally Posted by bimmer328xi View Post
...Just some carbon build up but it looks the same as the good cylinders so I may to tow it to a shop.
Six Weeks ago, in Post #5 in this thread:
"As for the misfire codes, if ALL THREE Bank 2 cylinders are misfiring, what those 3 coils have in common is the SAME Ground point (X6177) per this TIS Installation Location:
https://www.newtis.info/tisv2/a/en/e...nder-6/S8BHEJU
Did you ever look at that TIS diagram to understand how the coils on cylinders 4,5,6 are grounded separately from the coils on cylinders 1,2,3?

Did you ever test for continuity to ground at the Coil Connector Brown wires on coils for cylinders 4,5,6 & inspect/jiggle the ground connection X6177 to ensure it was tight?

Here is the TIS circuit diagram for the coils on the late 2007 328xi E90/E91, which shows how those three coils are ALL grounded at X6177, and the post 6 weeks ago, copied above, shows WHERE that ground point is located:
https://www.newtis.info/tisv2/a/en/e...nition/x7JApNv

George

Last edited by gbalthrop; 10-20-2019 at 09:09 PM.
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  #27  
Old 10-20-2019, 09:21 PM
bimmer328xi bimmer328xi is offline
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Hey George - I did look at that diagram actually and I did do a visual inspection although I am a little skill capped here. Here's what I noticed:

The diagram looked a little different from what I see on my N51. My grounds are a little lower. I visually inspected all the electric cables on bank 2 and then looked at bank 1 for comparison. They look substantially the same and I don't see any exposed wire or anything.

What can I do as a DIY-er to check more on this? I do have a multimeter. Should I unscrew the terminal, hit it with steel wool and re-attach it to make sure its grounded?

Thanks!
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  #28  
Old 10-20-2019, 11:30 PM
gbalthrop gbalthrop is offline
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Attached are photos of my 3/14/2007 build N52KP (1) Rear Ground X6177, between coil connector #6 on left, and coil #5 or right; and (2) photo of Front Ground X6176 between coils #1 & #2. The small nut secures a connector that serves all three Brown ground wires on each bank.

Apparently the location or configuration of the Ground Connector X6177 differs slightly on the N51 SULEV, and here is the TIS Installation Location for the N51:
https://www.newtis.info/tisv2/a/en/e...r-1/1VnbgHox4B

Check to makes sure the nut is snug and you cannot move/wiggle the connector X6177. Then test EACH Brown wire Electrically, by testing for continuity between the stud to which Connector X6177 is attached, and Pin #2 (Brown wire) of each of the coil connectors on cylinders 4, 5, 6. All THREE of the coil connectors must be disconnected from their respective coils for valid test. Those connectors look like this:
https://www.newtis.info/tisv2/a/en/e...i-lim/Ck1LjFkP

If you are NOT familiar with how to test for continuity using a DMM (Digital Multimeter):
1) simply select an Ohms/Resistance setting;
2) turn meter ON;
3) touch the probes (Red & Black) together and see the meter reading (nearly .000 ohms or virtually NO resistance;
4) now place one probe on the ground stud and the other probe in socket #2 (brown wire) in each Coil Connector (disconnected from coil) and you should see a similar reading -- a high ohms reading indicates a bad ground; jiggle the connector sheath near the stud to make sure continuity remains and wires are NOT loose. As a final check, do a similar continuity test between the ground stud at X6177 and the Jumpstart Terminal Chassis Ground Hex Pin (NOT the B+ HOT terminal under the Red Plastic cap)

Please let us know what you find,
George
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  #29  
Old 10-21-2019, 08:25 PM
bimmer328xi bimmer328xi is offline
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Wilco, gonna try that as soon as I can and see how it goes. I will post some pictures as well.
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  #30  
Old 10-23-2019, 08:17 PM
bimmer328xi bimmer328xi is offline
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Hey George. I followed your instructions closely just now and here's what I found on the multi meter.

Coil 4 - Usually 0.1 to 0.2 depending on how well I inserted the probe into the #2 slot
Coil 5 - This was the high one at 0.5. I tested 3-4 times but it seemed to be higher than the others
Coil 6 - Usually 0 to .02 in the range.

Tested the ground to the body and cable and usually came back at 0.0.

The nut appeared to be tightly on for both bank 1 and bank 2 (photos attached). I removed and re-tightened both and scraped the connectors for some fresh metal with a flat head screwdriver. I put a tiny, tiny amount of dielectric grease on bank 2. Let me know what you think
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  #31  
Old 10-26-2019, 10:38 AM
bimmer328xi bimmer328xi is offline
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So I fired up the BMW and cleared codes and interestingly enough the misfire on 4,5,6 HAVE disappeared. I retested the OHM resistance and polished off the connectors.

It runs better now (thanks George) but it throws a P00BC MAF error code and sounds a little funny running. I think this goes back to the original issue which is some sort of issue with the VCG replacement.

This video seems to indicate maybe its a bad crankcase breather.

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  #32  
Old 11-01-2019, 09:57 PM
bimmer328xi bimmer328xi is offline
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Just to close out this thread, I took the car to a master certified mechanic and here's what came back.

Rough idle is due to crankcase ventilation failing or hoses cracked from VCG replacement
Lean running due to air pump and gasket failing.

I had the replace the latter and that also fixed the clicking sound. They did say the grounding was also improper so they restrapped something. Going to do the crankcase portion myself.

Thanks all for the support. We had 2 issues so it was particularly hard to diagnose. Good news is the VCG is sealed tight.
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