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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-12-2017, 01:02 AM   #1
Pushrod
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Join Date: Dec 2016
Location: Carmichael Ca
Posts: 42
My Ride: 2001 BMW 325i
Unique misfire issue

Hello everyone new to the form here and I posted an introduction in the new member introduction section of this form already. I just purchased a few months ago 2001 BMW 325I E46. I got the car for $2100 with 150,000 on the clock. It's in really good condition for the price that I got it for and for the most part is mechanically sound. Although I have a misfire issue that's bugging me. I have been religiously reading this form and others every day for the past few months trying to figure out a direction to go with this issue. I've already done all of the first "go to" things when a misfire issue happens. The very first thing I did to this car when I got it was a full tuneup and oil changes which included new OEM NGK spark plugs and OEM boots. I ran a can of seafoam to one tank of gas three times already which cleaned it up a lot. I have a intermittent misfire code P1351 that never goes to full status. It will pop up in pending status and disappear as quickly as it came. This happens about once a week maybe two times a week. The code pops up pending and then goes away. The car doesn't idle rough it doesn't run bad or shows any signs of an actual misfire. I've swapped coils around and this particular code keeps popping up. I'm wondering if it could be an engine problem like a sticky valve or something. I have not done a compression test yet. The search button has been my best friend for pretty much everything that I've done to this car already and I wouldn't make a post like this if I didn't absolutely have to. Does anyone have any ideas for me?


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Old 01-12-2017, 03:50 AM   #2
Pushrod
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Join Date: Dec 2016
Location: Carmichael Ca
Posts: 42
My Ride: 2001 BMW 325i
I hope I posted this in the right section


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Old 01-12-2017, 07:10 AM   #3
UncleShrek
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Join Date: May 2016
Location: Humble, Tx
Posts: 223
My Ride: 2000 323i Touring
Funny, I have the same issue.
Cylinder #2, I'm hoping this engine lasts at least another year.
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Old 01-13-2017, 11:18 AM   #4
Kyrazh
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Join Date: Mar 2016
Location: rostov on don
Posts: 53
My Ride: e39
1. spark's gap
2. sparks itself
3. The tip of the spark plug

very often!
4. coils
5. injection
6. low compression because of
6.1 bad pistons/rings
6.2 bad valves
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Old 01-16-2017, 06:42 PM   #5
UncleShrek
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Join Date: May 2016
Location: Humble, Tx
Posts: 223
My Ride: 2000 323i Touring
I replaced ignition coil on cylinder #2, cel went away.
Came back about a week after, same code, same cylinder.
So today I replaced the spark plugs, man what a difference. Crisp acceleration, no exhaust pop, I'm pretty surprised how much new spark plugs do.

Last edited by UncleShrek; 01-16-2017 at 06:42 PM.
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