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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 09-25-2013, 07:04 PM   #1
tpike08
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Ses lamp..possible ignition coil failure?

I drive a 2002 325xi Sedan and I am at 105,000 miles. The past couple days I have noticed a skipping or vibration in my gas pedal, but it would only last a second or two and it would always happen at low RPM in 1st or 2nd or 3rd gear and then once I was over 2500 RPM it would be fine..now 2 days later it has gotten worse. Today it threw its first SES lamp of its life and my power is suddenly gone. The car runs like crap, it it takes forever to accelerate in any gear at any rmp. It won't die when it idles, but the whole car will shake. I am thinking its a ignition coil(s)..I know plugs were do a 100k so I plan on doing those with the coils if that's what it turns out to be. I just got customer service job at Midas so I am going to have the ses lamp read tomorrow. Can anyone confirm my thinking that it could be the ignition coil(s)?

To top it all off my OFHG is leaking..i wonder if BMW has a recall out for that yet
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Old 09-25-2013, 08:32 PM   #2
SamDoe1
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I think your diagnosis of a misfire is correct, here's what I would do:

Instructions:

1.) Get code read and note cylinder that is misfiring, if you have multiple or all cylinders misfiring then there are other issues.
2.) If only one cylinder is misfiring then swap that coil to another cylinder and see if the misfire follows. If it does then replace coil, if it stays the same it's time to change spark plugs...which you are due for anyway.
3.) If all or multiple are misfiring, you likely have a tear in your intake boot causing a lean condition or this is an early sign of your fuel pump getting ready to take a dump. If it's the latter then replace pump and filter at the same time.
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Old 09-26-2013, 07:36 AM   #3
Kubica
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Scan codes first.
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Old 09-26-2013, 08:46 AM   #4
tpike08
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This morning on the way to work the car ran fine..however the last two miles it was acting up again..I assume its because the coils warmed up. Anyhow, codes were diagnosed this morning at work..it was just one coil. I have a coil and 6 NGK plugs on the way today. I plan on replacing the other 5 coils soon so this doesn't happen again...
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Old 09-28-2013, 09:42 AM   #5
bmwbob89
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You only need to replace the bad coil.
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Old 10-07-2013, 02:32 PM   #6
rizzo2008
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Quote:
Originally Posted by bmwbob89 View Post
You only need to replace the bad coil.
Are you sure? If 1 or 2 are failing wouldn't that be a sign the others will fail or malfunction soon as well? I am considering just replacing all 6 coils and sparks plugs (since the latter are due anyway). Is this an overkill?

Reason I'm asking is I've been having an identical issue as the OP (rough idle, loss of power, intermittent SES light, etc). My car is a 05 330ci with 122,000 miles and a manual transmission. Usually the issue will occur under load at lower RPMs but I will just pull off the road turn the car off for a minute or two and it starts and runs fine as if nothing happened. OBDII reader found stored codes for misfires on cylinders 2 and 3 although the SES light is not currently on.
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Old 10-07-2013, 02:39 PM   #7
SamDoe1
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Ignition coils aren't really wear components that need to be replaced for PM. I'd just replace the one and see how it goes. If another fails within the next few weeks, then swap them all but I doubt that'll happen.
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Old 10-07-2013, 02:49 PM   #8
tpike08
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Well folks, my car is starting to skip again at low rpm however I have not lossed any power yet. It seems another coil is soon on its way out. I will probably just swap the rest out as PM. I can get the parts at wholesale so why not.
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Old 10-21-2013, 05:05 PM   #9
tomoyer
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Read the Codes!!! If you have a random Mis-Fire across more than one or all cylinders, pull the Air Flap Assembly (sorry, forget the correct name and abbrev.) on the Intake Manifold and see if it is broken. When the Flap breaks, it will stick in either closed, partly closed or full open and it will give you drivability issues and random misfires. If the Flapper is ok, depending on the codes, pull and change the spark plugs (since its due), making sure you check for oil on the plugs and on the coil boots. If there is a presence of oil, it indicates leaking valve cover gasket seals around the spark plug tubes, this leaking oil can cause the coils to "short out" not providing full spark to the affected plug(s). First and foremost though, Have the Codes Read.
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Old 10-21-2013, 05:12 PM   #10
tomoyer
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Intake Manifold Resonance Valve.
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Old 10-22-2013, 07:59 AM   #11
tpike08
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Based on what happened to me this time, you can start by just replacing a boot. After swapping coils and getting a new ignition coil I found out it was just a 8$ boot all along.
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