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XBimmers | BMW X3 Forum BMW X3 Forums | E83 (2003-2010) First Generation BMW X3 General Forum X3 3.0 Backfiring and missfiring

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      05-22-2019, 09:45 AM   #1
skylined_gtr
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X3 3.0 Backfiring and missfiring

Hi All,

Hoping someone can give me some guidance. I've got a 2004 (54) X3 3.0 Sport, Auto, been a great car but has suddenly developed a fault.

Been parked for a couple of weeks, went to start it and wouldn't stay running, it went to 1k rpm then dropped almost instantly.


Tried again but this time gave it some pedal to about 2k, was really struggling to stay alive and backfiring through the inlet manifold.

Rev up to 4k, the backfiring is reduced (i.e. a lot less frequent), but again struggling and the odd misfire.


Read the codes using INPA, it came up with Air Mass Meter and Thermostat Map Cooling Control. Cleared the codes, tried it again without the Air Mass Meter but got exactly the same results (as described above). The error codes haven't returned since. Bought a new Air Mass Meter anyways to try it out but same results.

I ignored the Thermostat Map Cooling Control (I assume this is the ECU water temp sensor?) Could this be the trouble?


Pulled the spark plugs out, coated in fuel so it looks like it's dumping a load of fuel in? Not sure. I'm thinking massive air leak somewhere (although I can't hear one) but I can't think where to look. Are there common failure points on this engine?

Help!

Last edited by skylined_gtr; 05-22-2019 at 09:55 AM..
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      05-26-2019, 12:25 PM   #2
skylined_gtr
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Bump - anyone got any ideas?

I've disconnected the battery for a few hours and reconnected. Same problem.
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      05-26-2019, 11:20 PM   #3
rmepilot
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Is your battery fully charged?
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      05-27-2019, 04:45 AM   #4
skylined_gtr
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I should've mentioned yesterday - when I disconnected the battery, I put it on charge for 4 hrs so it was charged when I put it back on
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      05-27-2019, 09:20 AM   #5
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Water or other contaminates in your fuel? Try taking a sample in a clear glass jar and look at it.

Iím trying to eliminate the basics, before throwing parts at it.
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      05-29-2019, 01:11 PM   #6
skylined_gtr
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Ok I'll give that a go this weekend and see if something could've gotten in the fuel. Highly doubt it though, the car is garaged with only me that has access, the fuel is the same fuel the car was driven with before it was parked up.


Any other ideas so I can have a shopping list of things to try? :-)
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      05-30-2019, 06:15 AM   #7
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Try looking here:

https://forum.e46fanatics.com/showthread.php?t=897616

The e46 guys will have better knowledge on the m54 and troubleshooting issues. Sorry I can't be much more help, as I just got back into the bimmer world.
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      05-30-2019, 03:10 PM   #8
skylined_gtr
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Thanks for the link, I'll give it a shot there :-)
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