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GEOS07335i GEOS07335i is offline
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Default HELP:Another Misfire Thread but this is more complicated - 02-13-2018, 11:09 AM

Hi first post and this is a duzy. I have an 2008 E93 335i 124K that I recently purchased as a project with the hopes of getting her back on the road. Car is bone stock no mods yet.The car was running rough when I first purchased it. INPA showed misfires on Cyl 4. The car through about 22 error codes and for the purposes of this I've fixed all but 2 or three 3 codes. Long story short I have removed the stored log history witch was a mistake on my part now looking back.

So here is what I've done so far. Bare in mind I have a misfire on cyl 4 code and car runs really rough. Engine Service Light is on.

1) Replaced all NEW Spark plugs with Bosch Swapped out with cyl 1 wiped codes and misfire persist on cyl4 comes back within a minute of running.
2) Replaced all NEW coils with Bosch. Swapped out with cyl 1 wiped codes and misfire persist on cyl4
3) Swapped out all 6 injectors from a working wrecked car. Coded using INPA. Swapped out injector on cyl 4 with cyl 1. DID NOT recode cyl1 or cyl4 and misfire still persistent on cyl4.
4) Did a walnut blast at a buddies house car ran like crap all the way there. This did nothing for the rough idle and misfire on cyl4.
5) Cleaned VANOS Solenoids (did nothing for rough idle and misfire on cyl4) it did remove what sounded like lifter tick.
6) Did compression check. (did on a crappy compression tester I believe the values are considerably higher if I used a good compression tester) Anyone know what the actual compression should be?
cyl1-155
cyl2-155
cyl3-135
cyl4-150
cyl5-145
cyl6-150

Guys I'm at a real loss to figuring this out. I'm definitely bit off more than I could chew. Could really use some help. Car is been sitting in the garage now for almost 2 months will all of the stuff I've been trying to do and diagnose. Any help would be greatly appreciated. I do have INPA 5.0.6 and ISTA+ running on my PC.
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Maximum996 Maximum996 is offline
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Default 02-13-2018, 02:17 PM

What are the fault codes ? Could be a blown mosfet.


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NoQuarter NoQuarter is offline
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Default 02-13-2018, 02:41 PM

I like the blown mosfet possibility.

The DME can be removed, pried open and the MOSFETs easily tested with a continuity tester.

If MOSFET nbr 4 is bad then all this is reasonable.

That said... their is often a code that makes it clear something is up with the DME. But with all the work you have done, I would go straight to testing this out.

just hit the google for BMW mosfet testing or search the popular forums. This has a few years of forum discussions behind it.

good luck!
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dsjr2006 dsjr2006 is offline
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Default 02-13-2018, 03:19 PM

What are the codes?

Previous owner tell you what led to it being parked?


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GEOS07335i GEOS07335i is offline
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Default 02-14-2018, 06:25 AM

Here are some pics. My DME is an MSD81 I heard these arent prone to the MOSFET failures common on 07 MSD80 DME's. Also when I took my DME apart the MOSFET chips are not in the same location as they are in an MSD80. No idea witch is witch but I tested all of the drivers with a continuity test and all seem fine.

I dont want to just throw parts at this. With all the work I"ve done on thisso far I just dont want to continue to swap parts. Money does not grow on any tree in my back yard. Really looking for some one that knows what there talking about and can provide good advice on what to test or what are some common issues I should be looking at.
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NoQuarter NoQuarter is offline
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Default 02-14-2018, 08:10 PM

Next idea...

Take a look at injector 4 again and make sure it seats firmly with no play.

If someone in the past installed an injector without the clip, the injector will wiggle until eventually wearing open the hole making it too large to seal properly again.
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GEOS07335i GEOS07335i is offline
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Default 02-15-2018, 05:12 AM

I actually swapped out injector 4 with injector 1 cleared codes and ran the car. I have the clips on they seat just fine. The little tab is planted as far down as it can go by hand. I still get the misfire on cyl 4. Thanks for the idea though.
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NoQuarter NoQuarter is offline
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Default 02-15-2018, 09:08 AM

Quote:
Originally Posted by GEOS07335i
I actually swapped out injector 4 with injector 1 cleared codes and ran the car. I have the clips on they seat just fine. The little tab is planted as far down as it can go by hand. I still get the misfire on cyl 4. Thanks for the idea though.
What I am getting at is the actual seal where the injector is pressed into the opening. To check it out will require removing the spacer and inspecting for any looseness between the injector and the hole.

I have 2 examples of this: One is a very specific thread on someone finally chasing this down after nothing else fixed the problem. They wrapped the injector with something to make it fit tighter and it worked well enough than replacing the head.

The second is my own example: I had a misfire that the dealer diagnosed and they saw that ALL of my injectors where missing the rings (from a previous dealer service prior to me owning it). They were so concerned they might need to replace the head (under warranty) that they called in a BMW engineer/inspector.
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GEOS07335i GEOS07335i is offline
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Default 02-15-2018, 10:01 AM

I think I see what your saying. The seals (black rubber orings thingies) on the injectors felt pretty tight when they go into the hole. In other words I dont feel any loose play. You have to snug them in. Similar to pulling out the coil off a spark plug. There not in that tight but snug. Also all of the injectors have seals on them. They all stick out slightly. Also all of the fuel injectors have the decouplers - rings on them. Granted they were reused from my original fuel injectors. I did not replace the decoupler rings with new ones.
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GEOS07335i GEOS07335i is offline
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Default 02-15-2018, 02:38 PM

Here is a video of running INPA but to be honest I have no idea what I'm doing and a little hesitant to start clicking on things.

https://www.youtube.com/watch?v=TxpcK0-23OY">https://www.youtube.com/watch?v=TxpcK0-23OY" type="application/x-shockwave-flash" width="800" height="600">
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aus135i aus135i is offline
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Default 02-16-2018, 05:59 AM

A long shot but did you check the fuel line running to injector 4 from the rail? It' not blocked or gummed up? If the car was sitting for a while the fuel sitting in the rail and injector lines may have gone ****.
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Default 06-07-2018, 09:00 PM

What eventually happened with this issue?
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