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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 12-01-2011, 07:48 AM
Robert Chessel Robert Chessel is offline
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Mein Auto: 1998 323is (e36)
rough idle/ execration,need confirmation before ordering parts

Ive looked at dozens of posts where people have had the same symptoms, where one day out of the blue my e36 98 323is develops what feels to be a misfire( rough idle and execration & loss of power) . i took it to a shop who scanned it for me and i am aware i can replace it all and it "should" be fixed but wheres the fun in that, with that being said in troubleshooting throwing parts at a problem is not the correct answer. i am also aware that some problems can trigger other codes, thats where I hope your expertise in deciphering code combinations as they relate to one another could come in helpful. Here are the codes

Rough Running Related
P0301 cyl 1 misfire
p0141 O2 sensor heater malfunction
p1519 Vanos control, end position fault
p0412 Second air injection sys value "A" malfunction

"Oops, I Broke a prong on my ABS plug while changing brakes" Related.
P0600 Serial comm link malfunction
p0500 vehicle speed sensor "A" malfunction
p1747 ABS malfunction

Troubleshooting steps taken.
1. I followed the Bentley manual on testing the coils and I'm getting 0.5-0.7 ohms on all of them.

2. i used a technic found on another site to being sure you have fire by grounding the plug threads with a wire and starting the car. ALL plugs and coils fired.

3. i inspected the plug in cyl #1 (misfire code) vs the rest. first picture is cyl #1 plug and picture 2 is what the rest look like. as you can see plug 1 is wet and carbon coated
http://www.bimmerfest.com/forums/att...3&d=1322753128
http://www.bimmerfest.com/forums/att...4&d=1322753128


4. i reinstalled the plugs into the same cyl they came from and swapped the coil from cyl 1 to cyl 4 and than reset the codes. car still ran rough and after driving 20 miles and retesting codes its only giving 2 codes
P0412 second air injection sys "A" malfunction
P0141 O2 sensor heater circuit malfunction bank 1 sensor 2
5. i reinspected the plugs as i was replacing them with new ones and picture #3 is the plug that i pulled from cyl 4 and the symptom of wet plug changed when i moved coil. picture 4 is the plug in cyl 1 where the misfire wet plug symptom original happened but now burns clean.
http://www.bimmerfest.com/forums/att...5&d=1322753128
http://www.bimmerfest.com/forums/att...6&d=1322753128


6. i replaced all plugs and started engine and it ran smooth... it revved smooth, i backed out to the street and all is well. moving forward i feel a slight miss intermittently until its under load (execrating) and at this point alternating between rough and smooth. i got up to speed 60mph and now back to steady rough. when i got home i shut the car off and restarted it, back to smooth... until i execrate again.

am i right in assuming its just a bad coil and dead plug because it ran better when i changed the plugs but still has a miss when i put load on the coil plus the wet plug symptom changed when i switched what cylinder the questionable coil was in or can it be something I'm overlooking

Thank you so very much.
Robert
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Last edited by Robert Chessel; 12-01-2011 at 08:27 AM. Reason: add sign
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  #2  
Old 12-01-2011, 08:37 AM
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Killjoy Killjoy is offline
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You did a lot of good detective work that points to a faulty coil pack. Sometimes these things test ok even though they function only intermittently- I would replace that one coil pack and see where you that takes you. But that is my $.02.


Good luck!
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  #3  
Old 12-01-2011, 08:45 AM
Robert Chessel Robert Chessel is offline
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Mein Auto: 1998 323is (e36)
Thank you killjoy, all advise is welcomed.
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Old 12-01-2011, 01:14 PM
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drivinfaster drivinfaster is offline
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yes, i agree that swapping the coil was a good way to confirm a faulty coil. it's what i would replace first.


as for the other codes, have they come back after clearing??



df
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Old 12-01-2011, 02:17 PM
Robert Chessel Robert Chessel is offline
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Mein Auto: 1998 323is (e36)
P0412 second air injection sys "A" malfunction
P0141 O2 sensor heater circuit malfunction bank 1 sensor 2

are the only codes that came back
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  #6  
Old 12-01-2011, 02:29 PM
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drivinfaster drivinfaster is offline
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i believe there is a heater relay for the o2 sensor. it's ther to aid in getting the sensor up to operating temps and keeping it there. first thing i'd check on that.

the airpumps, possible pump failure, or fuse, maybe relay issue. been a while since i had to check one out but i'm sure a check of the forum will yeild good results to help in pinpointing the fault(s).



df
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  #7  
Old 12-01-2011, 09:42 PM
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JoshuaG JoshuaG is offline
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I got a set of working coil packs from my M if they will work for your car. $20 and shipping and they are as good as mailed.
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  #8  
Old 12-01-2011, 10:16 PM
Robert Chessel Robert Chessel is offline
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Mein Auto: 1998 323is (e36)
Thanks Joshua Can you send me photos and part # so I can cross reference them
Do you have a pay pal account? And why did you swap them ?
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Old 12-03-2011, 01:03 AM
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JoshuaG JoshuaG is offline
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I do have pay pal and I'll dig the parts out tomorrow morning. sorry I was slow.
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  #10  
Old 12-03-2011, 02:13 PM
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hornhospital hornhospital is offline
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What does "execration" mean? Seriously. I can't find a definition.

Nice job of diagnosing, Robert.
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  #11  
Old 12-03-2011, 02:31 PM
Robert Chessel Robert Chessel is offline
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Mein Auto: 1998 323is (e36)
wow thanks "horn hospital" way to call me out on a mistype. looking at the context of my description you can tell it was supposed to be acceleration. with that being said the definition of

execration (plural execrations)
An act or instance of cursing; a curse dictated by violent feelings of hatred; an imprecation; an expression of utter detestation. ***8195;[quotations ***9660;]
That which is execrated; a detested thing

which in the case of E36's the word seems to be completely relevant
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