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Old 09-14-2011, 02:59 PM   #1
garmcqui
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2001 e46 330i - Running rich, fuel trim and adaptations...

Hi guys,

The last few times I've checked my lambda/oxygen sensor adaptations usiong INPA, my long term fuel trims were set at -8% on both banks:




Today, I checked them again, as they were back to -8% and -7.8% respectively, showing it's still running rich :frown So once I'd reset them, I thought I'd record the live data (at idle) to see if anyone thinks there's a problem.

Lambda readings:



Adaptations (freshly reset, so showing 0)



Rough running:



Apologies for the poor quality, but had no other way of doing it at work! :frown

Car has covered 133k miles, do you think it could be duff pre-cat lambda/oxygen sensors?

Any help appreciated! Thanks!

Gareth

Last edited by garmcqui; 09-14-2011 at 03:14 PM.
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Old 09-14-2011, 03:11 PM   #2
TxZHP04
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Any stored codes?

My first guesses would be either a faulty MAF, FPR, or thermostat. Could also be bad O2s although it seems unlikely that both banks would go bad simultaneously. Could also be leaking injectors but, again, seems unlikely as the problem is in both banks.
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Old 09-14-2011, 03:21 PM   #3
garmcqui
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nope no codes stored, but I'm told if the long term fuel trim goes below -8%, there will be. So it's right on the limit of being able to adapt.

It had a new fuel filter (and incorporated FPR) about 18 months/20k miles ago, could it really be that again?

MAF - am I right in thinking I can test it by unplugging it and driving for a while, see if it's any different?

Thermostat - any way to test? The temperature needle in the car rises to the upright (12 o'clock) position and never moves from there once warmed up. However, now that you mention it, I have noticed lately that there is no "stream" of coolant at the top of the expansion tank, as I thought was usual:



This was today, after driving approx 20 miles. The dash temp needle was sitting at 12 o'clock, as it always does.

Thanks!

Gareth

Last edited by garmcqui; 09-14-2011 at 03:37 PM.
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Old 09-14-2011, 03:30 PM   #4
new//M3fan
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I would go over the crank sensor connector. Your rough running values are a bit off. Mine were as well until I crimped the pins on the crank sensor and reset the adaptations again as per DIS. Might sound stupid but it DOES make a big difference.

Also, Make sure your SAP valve is not stuck open.
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Old 09-14-2011, 03:36 PM   #5
garmcqui
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I've replaced both cam sensors with genuine BMW ones, where is the crank sensor located on these?

Neither of my 330i's have had SAP's, including this one. I'm presuming the valve can't be stuck open if the pump's not there?

Wouldn't the SAP stuck open cause a lean condition though?
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Old 09-14-2011, 03:49 PM   #6
new//M3fan
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Quote:
Originally Posted by garmcqui View Post
I've replaced both cam sensors with genuine BMW ones, where is the crank sensor located on these?

Neither of my 330i's have had SAP's, including this one. I'm presuming the valve can't be stuck open if the pump's not there?

Wouldn't the SAP stuck open cause a lean condition though?
You're in london and you probably have a euro3 emissions spec vehicle.

So you don't have to worry about the valve.

The crank sensor is just underneath the starter.

What I mean't by crimping the connectors is this:

http://forum.e46fanatics.com/showthr...781&highlight=

Do it on all the connector pig tails that it is possible to do so.
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Last edited by new//M3fan; 09-14-2011 at 03:50 PM.
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Old 09-14-2011, 04:02 PM   #7
garmcqui
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Cool, will have a look at that, thanks!

What about there being no stream of coolant entering the expansion tank? Do you think this could be a problem with the thermostat? I don't understand how the temp gauge can still show perfect temperature.
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Old 09-14-2011, 04:38 PM   #8
TxZHP04
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The temp gauge is buffered and will point straight up across a wide range of temps. The thermostat isn't stuck closed or you'd likely have overheated by now. Could be stuck open though which would cause you to run a little cool and thus a little rich.
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Old 09-15-2011, 03:03 AM   #9
garmcqui
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OK, well I enabled the hidden temperature menu this morning on the way to work (15 miles).

Once up to temperature, it sat at 090 practically the whole way, dipping to 089 and rising to 092 a few times. I'm presuming these figures are degrees celcius (090 = 90C)?

Is this what it should be doing?

Thanks
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