My first muck around with new Nanocom

**coops71** · 4th September 2012, 09:38 PM

Got the new device today.
SLABS had Right front sensor (intermittent) logged. Cleared that fault and my 3 amigos went out along with the park brake light which was always on too. The whole lot soon returned after I tried the hill descent button. Guess I need to fix that right front sensor.

Had the following faults from the TD5 engine menu:
3,7 airflow circuit(logged high)
16,2 high speed crank(logged)
27,1 injector 1 peak charge long (logged)
31,1 injector 1 open circuit detected (logged)

I’ve been having a problem with a resonation/vibration around 2000-2300rpm. That disappeared 90% after I disconnected the MAF. It also cured the on/off problem I was getting with very light throttle.

Not sure how old these engine faults are but I cleared them and nothing returned after 30km of driving.

Cruise control is not working. I had a play with the inputs menu and found that my brake switches are working, but my cruise control resume and set buttons don’t register when played with. Maybe the switches are bad or are not connected behind the wheel? Overall not a bad result after playing around for 30 minutes to get a clue of how the gadget works.

**turbopsi** · 4th September 2012, 09:49 PM

Any leads on how the vibration and disconnecting the MAF might be related?
Would have thought if the MAF was faulty it would effect more then a 300rpm power band?

Cheers
Tony

**coops71** · 4th September 2012, 09:57 PM

Originally Posted by turbopsi

Any leads on how the vibration and disconnecting the MAF might be related?
Would have thought if the MAF was faulty it would effect more then a 300rpm power band?

Cheers
Tony

Overall it seems to move smoother through the gears, seems to have also lost a bad kangaroo habit when given a bootful, plus it's more responsive at all revs. I'll have to look in to cleaning the MAF. I'm getting through these things one at a time.

**turbopsi** · 5th September 2012, 08:49 AM

I also hope to order a nanocom soon. Are you able to use the nanocom to read the output values of the MAF and compare to working MAF values?

I've read a few posts on the forums about members using their nanocoms to diagnose bad MAF's.

**coops71** · 5th September 2012, 02:14 PM

Originally Posted by turbopsi

I also hope to order a nanocom soon. Are you able to use the nanocom to read the output values of the MAF and compare to working MAF values?

I've read a few posts on the forums about members using their nanocoms to diagnose bad MAF's.

I'll let you know when I have a good play around with it. For the time being I've bought some electronic contact cleaner to give the MAF a good clean.

**OffTrack** · 5th September 2012, 03:01 PM

Originally Posted by coops71

I'll let you know when I have a good play around with it. For the time being I've bought some electronic contact cleaner to give the MAF a good clean.

The kangaroo is most commonly the result of a faulty wastegate modulator allowing the boost to exceed 20psi. This causes the ECU to kill the fuelling until boost drops, and the cycle starts again.

Disconnecting the MAF forces the ECU to use default values for airflow, so it's potentially reducing performance to a point where the boost doesn't hit 20psi .

You can view the air flow figure which is generated by the MAF in the Nanocom. It should be 50-60gr/hr at idle and will peak at 600-650gr/hr at full throttle under load. If you can't hit 600gr/hr flooring it up a steep hill you have a problematic MAF. There are also some resistance measurements in Good Oil. Please note that there is a body of evidence that suggest mturri's "dodgy maf" readings are incorrect. The 6 month old MAF in my vehicle and a brand new VDO item both measured around the same as a supposedly dodgy MAF (20M ohm). Both vehicles run fine.

cheers
Paul

**turbopsi** · 5th September 2012, 03:04 PM

Good luck with the contact cleaner. I guess you now have the nancom to help you if further fault finding is required.

**coops71** · 5th September 2012, 05:10 PM

Originally Posted by OffTrack

The kangaroo is most commonly the result of a faulty wastegate modulator allowing the boost to exceed 20psi. This causes the ECU to kill the fuelling until boost drops, and the cycle starts again.

Disconnecting the MAF forces the ECU to use default values for airflow, so it's potentially reducing performance to a point where the boost doesn't hit 20psi .

You can view the air flow figure which is generated by the MAF in the Nanocom. It should be 50-60gr/hr at idle and will peak at 600-650gr/hr at full throttle under load. If you can't hit 600gr/hr flooring it up a steep hill you have a problematic MAF. There are also some resistance measurements in Good Oil. Please note that there is a body of evidence that suggest mturri's "dodgy maf" readings are incorrect. The 6 month old MAF in my vehicle and a brand new VDO item both measured around the same as a supposedly dodgy MAF (20M ohm). Both vehicles run fine.

cheers
Paul

I've been meaning to bypass the modulator to see if the issue goes away. I'm guessing I have a couple of minor issues combining to make things less than perfect.

**bsperka** · 5th September 2012, 09:06 PM

Originally Posted by coops71

I'll let you know when I have a good play around with it. For the time being I've bought some electronic contact cleaner to give the MAF a good clean.

Whilst you have already bought the product and I don't know the specific composition of the contact cleaner, I thought I'd point out to other forum users that there is a specific MAF cleaner product available (by CRC, IIRC). I've used this on a number of MAFs to date, so 1 can goes a long way.

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