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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 09-18-2011, 10:43 PM   #1 (permalink)
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1998 740il ODB codes

Need help, Check engine light.

1) Electric thermostat final stage

2) pre cat o2 sensor aging

3) fuel trim QL additive

Looks like 1 and 2 are warnings, but #3 not sure about.
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Old 09-19-2011, 02:40 PM   #2 (permalink)
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Is it running "rich" or even misfiring?
Have a smell at both tail-pipes a get back to us with your results mate!
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Old 09-19-2011, 02:47 PM   #3 (permalink)
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No Misfire, no smell it's running rich, No smoke coming out when accelarating.
Car is running smooth even during idle.
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Old 09-19-2011, 02:53 PM   #4 (permalink)
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TBH I would firstly disconnect the battery for an hour to reset any OLD codes...
Reconnect and notice that the car might run a little worse for a while as the ECU Re-Learns your driving techniques/habits lol... And maybe while it's disconnected, why not clean the MAF? This might be causing the richness.
Just an idea my friend !!
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Old 09-22-2011, 11:32 AM   #5 (permalink)
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TBH I would firstly disconnect the battery for an hour to reset any OLD codes...
Reconnect and notice that the car might run a little worse for a while as the ECU Re-Learns your driving techniques/habits lol... And maybe while it's disconnected, why not clean the MAF? This might be causing the richness.
Just an idea my friend !!
I just recently noticed a random puff of smoke sometimes when accellarating from a full stop. Thanks

were is the ECU and MAF location.
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Old 09-22-2011, 01:14 PM   #6 (permalink)
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The ECU is under a plastic cover under the hood behind the suspension strutt.
The MAF's are between the airboxes and throttle-body...
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Old 09-23-2011, 11:42 PM   #7 (permalink)
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Thanks. I'll check it out.
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