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Old 07-18-2012, 11:15 AM
TexasBMW's Avatar
TexasBMW TexasBMW is offline
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Mein Auto: 08 X54.8 04X54.4 00E46CiC
Anyone Replaced a Coil Pack?

Hi, I'm having a rough idle and Service Engine Light illuminating after a few minutes each time I start the 2004 X5 4.4i. I think it's probably the coil pack. I haven't done an OBDII on it, yet.

Anyone had theirs replaced, and what was the cost?
2013 X5 5.0 Black 02/13
2008 X5 4.8 Space Gray/Tan/Dark Burl - Delivered 01.30.08
2004 X5 4.4 Silver. Acquired 02.12
2000 E46 Vert
2001 X5 4.4, Ret.
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Old 07-18-2012, 11:50 AM
Mudnyrey Mudnyrey is offline
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Location: Beaverton, OR
Join Date: Jul 2012
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Mein Auto: X5 3.0i
I would suggest getting your codes read first.

Replacing the coil packs and plugs isn't a difficult job and is really easy to get to with a few tools.
By removing the top cover and two screws you can get to your coil packs and spark plugs. I've replaced the spark plugs in which you have to remove the coil packs, the coil packs aren't too costly at what I found of $35ea.

There are many possibilities that can cause rough idles such as; MAF, CPS, Adjuster Unit, O2 sensor to name a few and possibly a coil pack to, but distinguishing which one is key and could save you $$ guessing.
I am currently going through the same thing. I bought some MAF cleaner and removed my Mass Air Flow Sensor and cleaned it, however the result hasn't changed. Still could be my MAF but there are two, throttle body and secondary. Front and Rear O2's, CPS = Intake and Exhaust and so on.
I pulled these codes yesterday on my vehicle (04 X5 3.0L) PO171 & PO174 which indicate the following;

PO171 = Fuel trim bank one condition; 1) Oxygen sensor defective 2) Ignition misfire-repair 3) Fuel injector problem
PO174 = Fuel trim bank two condition; 1) Ignition misfire condition 2) Fuel injector problem 3) Engine mechanical condition

After some research and removing and cleaning the Throttle body MAF, I found that the DISA unit on the intake or better known as the "Adjuster Unit" is a known problem of going bad. However, I am uncertain to find that this could cause rough idle conditions? I am still looking into the similar issue of "Rough Idle". It could be an Idle control valve issue, which is located under the intake manifold. However, I've decided to change the DISA unit anyway and will have my vehicle placed on a computer to help diagnose my issue futher just in case.
I removed the DISA unit yesterday and found it in bad condition, and from what I read about some of it's stories of the pin in this until, i'd feel safer just changing it anyway

I will repost my findings later this evening as my APPT isn't until 3pm. (PST) to better diagnose any further issues.


Last edited by Mudnyrey; 07-18-2012 at 12:03 PM.
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Old 07-19-2012, 11:29 AM
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tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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Mein Auto: Dinan //M5, Dinan 4.8iS,
^2nd on reading the code(s) Dont just replace random part(s) and hope that the problem will be fixed.

2000 Dinan S1 //M5 (my DD), 06 DINAN E53 4.8iS (wife's DD), 90 Straman Z32TT (my pride & joy ride)
Gone, but not forgotten: 01 E53 3.0i, 01 525i Sport, 03 DINAN 540i MSport, 01 //M5 and 91 Z32TT
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