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Old 10-04-2017, 05:28 PM   #1
e46chick92
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misfire issue

So I bought the 2000 323ci a month and half ago with a misfire (cylinder 1 and 5). heres what ive done and has not fixed the problem

- spark plugs
- tested ignition coils and fuel injectors
- tested the plug connecters and changed ignition wiring harness
- new oil filter and oil changed
- fuel filter and pump
- compression test all cylinders came back at 150-152
-changed disa valve
-intake and valve and valve cover gaskets are new
-vanos were swapped and new seals.


guy said the maf was new and camshaft sensors .
only other info I could give is sometimes the orange oil warning light comes on.
out of ideas!!!! any ideas would be helpful(:

Last edited by e46chick92; 10-04-2017 at 05:42 PM.
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Old 10-04-2017, 05:37 PM   #2
lyssword
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Idk, a long shot, but maybe camshaft position sensor?
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Old 10-04-2017, 05:39 PM   #3
e46chick92
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Originally Posted by lyssword View Post
Idk, a long shot, but maybe camshaft position sensor?

they were replaced. they do look like cheap ones from china tho. but I don't know.
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Old 10-04-2017, 07:29 PM   #4
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Read the first post in this thread at least 3 times: Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 10-04-2017, 07:44 PM   #5
Landlorder
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Read codes. Tell us in pxxxx format. Let us know your long term fuel trims. You have barely done work to vacuum leak areas. Smoke test should also be carried out. And check your o2 sensors are connected correctly.
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Old 10-04-2017, 10:31 PM   #6
e46chick92
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Quote:
Originally Posted by Landlorder View Post
Read codes. Tell us in pxxxx format. Let us know your long term fuel trims. You have barely done work to vacuum leak areas. Smoke test should also be carried out. And check your o2 sensors are connected correctly.
P0301 and P0305 are the codes
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Old 10-04-2017, 10:33 PM   #7
e46chick92
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Quote:
Originally Posted by jfoj View Post
Read the first post in this thread at least 3 times: Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616


I appreciate reposting that but that is exactly where I got my list and started waking away on them and have not got any fix
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Old 10-04-2017, 11:04 PM   #8
LeverThis
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How did your old spark plugs look?

Were 1 & 5 different from the others?
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Old 10-04-2017, 11:19 PM   #9
e46chick92
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Originally Posted by LeverThis View Post
How did your old spark plugs look?

Were 1 & 5 different from the others?
I attached a picture. from just a look they are the same and all looked fairly new also.
Attached Thumbnails
Click image for larger version

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Old 10-04-2017, 11:45 PM   #10
LeverThis
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Quote:
Originally Posted by e46chick92 View Post
I attached a picture. from just a look they are the same and all looked fairly new also.
Interesting. I cant see the electrode end very well, but that doesn't look like the correct spark plug to me. It has only one electrode. I have a 2004 325i, so no direct experience here, but the Bentley lists one plug for all i/Xi models: NGK BKR6 EQUP The NGK's have 4 posts/electrodes.

Edit: Here are the oem ones I took out at 96k. The ngk's are similar:
Click image for larger version

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Not sure if that alone explains the misfires, though. Also, you mentioned the previous owner put a new MAF sensor. If that is also aftermarket, that could cause issues as well. I don't have much direct experience on this kind of issue, but those two questions jump out at me.

Also, if you haven't already, remove and examine the two intake boots for any cracks, especially at and under the bends/accordion areas, and confirm all the hose clamps are tight.

EDIT: How many miles?

Last edited by LeverThis; 10-04-2017 at 11:56 PM.
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Old 10-05-2017, 12:06 AM   #11
e46chick92
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Quote:
Originally Posted by LeverThis View Post
Interesting. I cant see the electrode end very well, but that doesn't look like the correct spark plug to me. It has only one electrode. I have a 2004 325i, so no direct experience here, but the Bentley lists one plug for all i/Xi models: NGK BKR6 EQUP The NGK's have 4 posts/electrodes.

Edit: Here are the oem ones I took out at 96k. The ngk's are similar:
Attachment 687193

Not sure if that alone explains the misfires, though. Also, you mentioned the previous owner put a new MAF sensor. If that is also aftermarket, that could cause issues as well. I don't have much direct experience on this kind of issue, but those two questions jump out at me.

Also, if you haven't already, remove and examine the two intake boots for any cracks, especially at and under the bends/accordion areas, and confirm all the hose clamps are tight.

EDIT: How many miles?

I checked the boots for cracks and seemed good to me. yeah I don't know how what maf he put it and from previous experiences (with audis) if the maf is bad it will stall and die. I have no stall. just misfires are idle. unplugging the maf didn't change anything and car ran without stalling with it unplugged. the spark plugs are the right ones . I actually got new ones again just incase but again changed nothing. the car just rounded 217,000. so I was worried the whole engine might be busted but so nothing has indicated such.

Last edited by e46chick92; 10-05-2017 at 12:07 AM.
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Old 10-05-2017, 01:48 AM   #12
LeverThis
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Quote:
Originally Posted by e46chick92 View Post
I checked the boots for cracks and seemed good to me. yeah I don't know how what maf he put it and from previous experiences (with audis) if the maf is bad it will stall and die. I have no stall. just misfires are idle. unplugging the maf didn't change anything and car ran without stalling with it unplugged. the spark plugs are the right ones . I actually got new ones again just incase but again changed nothing. the car just rounded 217,000. so I was worried the whole engine might be busted but so nothing has indicated such.
No change with the maf unplugged sounds like a good thing. But again I haven't had to troubleshoot something like this (yet) so I'm just guessing.

About the plugs, though, I don't know. They really don't look like the other e46 plugs I've seen, which all have 4 electrodes. By any chance, are you using the Bosch 7404 Standard Electrode OE plug or something similarly labeled/mareketed as OEM or equivalent? Like these: http://www.autohausaz.com/pn/7404

There are a plenty of threads on this issue, but I personally see no reason to replace a 4 electrode spark plug these cars/ignition systems originally was designed around with a single electrode spark plug, even if labeled OE or OEM. For me, I just cant see how the one prong could be equivalent to the four prong.

If you decide to change them out, Oembimmerparts.com (free shipping at $55+) is a good source online, among many others:

NGK's $43:
https://www.oembimmerparts.com/BMW-S...71003x6e46.htm

Bosch $38:
https://www.oembimmerparts.com/BMW-S...3x6bsche46.htm
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Old 10-05-2017, 02:06 AM   #13
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We need Freeze Frame and Fuel Trim data.

If the misfire is only at idle, this is more than likely a Lean condition. Usually unplugging the MAF will mask Lean conditions if they are not too bad because while the MAF is unplugged the engine is run in a fixed, richer Fuel MAP.

Is this a constant misfire or an intermittent misfire?

What OBDII tool or App are you using?
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 10-05-2017, 02:47 AM   #14
julianhappe
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don't bother for the oil light. if it goes out about 10 sec after cranking, it is the oil level indicator. for me it was 50, changed it while I did oil service....

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Last edited by julianhappe; 10-05-2017 at 05:23 AM.
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Old 10-05-2017, 09:29 AM   #15
CylonRed
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Quote:
Originally Posted by e46chick92 View Post
I appreciate reposting that but that is exactly where I got my list and started waking away on them and have not got any fix
You missed doing the first paragraph or 2 to actually diagnose the problem. His thread was not a - just replace these things - but actually to find out what the issue is by doing X, X, and X. He does have some common issues but that doe snot negate the need for diagnosis.
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