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X5 E53 (1999 - 2006)
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  #1  
Old 01-29-2014, 06:25 AM
GaBeemer GaBeemer is offline
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Mein Auto: 2006 BMW X5 3.0i
Exclamation Engine problems after plugs & coil change.

First time poster. I own a 2006 BMW X5 3.0i M54 with 135k mi.

Car was running great when I installed new NGK plugs and Bosch coils. Now I have a random issue described as follows:
- Always cranks fine; cold or hot.
- Usually within 5 minutes under normal driving conditions, the rough running episode hits (seems to happen during deceleration.) I know that the skipping is caused by a misfire which leads to the fuel being shut off to a cylinder.
- Recycles after switching off the ignition for 30 sec. but CEL is on with following codes:

Misfire #6 & #4
Catalyst System Efficiency Below Threshold (Bank 2)

I can clear the codes and after the engine is switched off for a while, the engine always runs fine...until about that 5 min. mark, usually during deceleration. Again, car was running great with no issues before I installed new plugs and coils. I have switched plugs and coils around, put the old coils back in, etc. to no change.

Verified that #6 plug is firing at start up (check)
No engine rattle so I do not suspect the DISA.
The issue seems to act like a vacuum leak. Maybe I pressed on a weak vacuum hose while changing the plugs?

Any hints based on your experience?
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  #2  
Old 01-29-2014, 11:37 AM
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Scott ZHP Scott ZHP is offline
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Mein Auto: 03 ZHP, 01 X5, 73 MGB
Dunno. Are you certain the ground lead/strap to the rear bank of cyls was reconnected?
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  #3  
Old 02-04-2014, 12:16 PM
aymanii aymanii is offline
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Did you find a solution ?


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  #4  
Old 02-10-2014, 09:43 AM
GaBeemer GaBeemer is offline
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Location: Thomasville
 
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Mein Auto: 2006 BMW X5 3.0i
Solution

Pulled the new spark plugs & new coils that had recently been installed and discovered debris under one of the electrodes. The trash was not covering the entire electrode so my guess is that was causing the plug to severely under perform, resulting in throwing a P0430 code.

Cleaned all plugs, applied di-electric grease inside the coil boots, installed and now purrs like a kitten. No codes for a week now.

Runs the way I was hoping after replacing the plugs and coils on a 135,000 mile X5.
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  #5  
Old 02-10-2014, 06:14 PM
puddinboo puddinboo is offline
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Mein Auto: 2003 BMW X5
thx for the the update I`m doing my plugs this summer and going to put dielctric grease on them.my engine purrs right now just going to do preventive maintenance ,since it has 200000km on it the plugs are do
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  #6  
Old 02-12-2014, 07:32 AM
luvmy03E53 luvmy03E53 is offline
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Mein Auto: 2003 BMW X5 3.0i
My '03 3.0i also has about 134k on it, and when I changed the plugs to new NGK's over the weekend, it appeared to me that they were the original plugs. Since that change I have a much smoother idle and a feeling of more power. Wishing I had done this earlier!



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2003 E53 3.0i
DOB 10/15/2002
Sienna red, Dakota leather
Type FA53, Engine M54

2013 F25 35i
DOB 10/15/2012
Alpine White, Rotbraun Nevada leather
Engine N55
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  #7  
Old 02-12-2014, 02:58 PM
puddinboo puddinboo is offline
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Mein Auto: 2003 BMW X5
mine runs smooth and the power seems awsome but I can only compare it to my 2008 g6 with 4 cyl in it.
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