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X5 E53 (1999 - 2006)
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  #1  
Old 08-12-2011, 11:54 AM
Racecar80 Racecar80 is offline
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Location: Cincinnati, Ohio
 
Join Date: Apr 2011
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Mein Auto: 1999 BWM 540i
2000 X5 idle missfire

I have an intermittent idle missfire problem. I originally had this problem & codes p1158 & p1160, as well as p0171 & p0174. I checked fuel pressure (good) & smoke tested it and found no air leaks, installed new Iridium plugs. and installed a MAF I got off the internet and the X5 even ran worse. I then purchaesd a Bosch MAF and it ran great for a couple of days but then started to miss again at idle. I no longer have any codes, but after you set for a few minuets in drive it will get a real slight shudder/stutter/miss that the longer you set there the worse it will get. The fuel trim numbers are good now too. I would appreciate any suggestions you may have. Thx Racecar80
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  #2  
Old 08-12-2011, 12:43 PM
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petener999 petener999 is offline
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Location: L.A-Cali
 
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Mein Auto: 750i, x5 4.6is, E46 M3
Check your ignition coils.
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  #3  
Old 08-12-2011, 02:00 PM
Racecar80 Racecar80 is offline
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Location: Cincinnati, Ohio
 
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Mein Auto: 1999 BWM 540i
I visually checked em when I changed the plugs & they look good, plus there's no miss at all under a load.
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Old 08-13-2011, 10:59 AM
sunny5280 sunny5280 is offline
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Location: Denver, CO
 
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Mein Auto: 2007 X5 4.8i
Quote:
Originally Posted by Racecar80 View Post
I visually checked em when I changed the plugs & they look good, plus there's no miss at all under a load.
I had an engine misfire with my 2001 4.4i. The problem ended up being mushy oil separator hoses. They're located near the back of the engine underneath the "BMW" cover on top of the engine. Might be an easy (and inexpensive) fix if these are the problem. How many miles are on your X5?
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  #5  
Old 08-15-2011, 05:47 AM
Racecar80 Racecar80 is offline
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Location: Cincinnati, Ohio
 
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Mein Auto: 1999 BWM 540i
It's got about 80k. I checked those, we're good there. I smoke tested the engine and didn't find any air/vacuume leaks.
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