Well I spent a couple of weeks up at Noosa and avoided the bushfires.
Before I left I serviced the Tuna, changed all filters, cleaned MAF sensor and reset learning values from the Air/ fuel ratio sensor. Vehicle performed as expected with good fuel and economy and performance all the way up.
Then nearly 2 weeks driving around with bushfire smoke lingering around.
Coming home I noticed the DPF going through a regen cycle after only 130 to 150 kms. And it did this constantly all way home. The regen itself worked flawlessly with good temps. Vehicle drove as normal in every other way. But 7 regens to get home had me thinking there is an emission issue.
Put the scantool on it to look at data with the MAF sensor in mind.
What instantly pinged my interest was the intake air temp sitting on 38 deg, it was only 19 deg ambient temp. The grams/ per second was low but itself was functioning fine.
3 times I had to clean MAF sensor to get the intake air temp reading back to what it should.
Only thing I can put this down to is contamination from bushfire smoke.
The other interesting thing is no fault code was logged, so not even the engine light come on. Nothing to even suggest there was an issue. Reason being the MAF sensor was still operating within its parameters.
The only symptom was the DPF going twice as many regen cycles than I would expect it to.
So if you have been driving around in bushfire smoke it would be a good idea to clean the MAF sensor.
Cheers, Spook.
Before I left I serviced the Tuna, changed all filters, cleaned MAF sensor and reset learning values from the Air/ fuel ratio sensor. Vehicle performed as expected with good fuel and economy and performance all the way up.
Then nearly 2 weeks driving around with bushfire smoke lingering around.
Coming home I noticed the DPF going through a regen cycle after only 130 to 150 kms. And it did this constantly all way home. The regen itself worked flawlessly with good temps. Vehicle drove as normal in every other way. But 7 regens to get home had me thinking there is an emission issue.
Put the scantool on it to look at data with the MAF sensor in mind.
What instantly pinged my interest was the intake air temp sitting on 38 deg, it was only 19 deg ambient temp. The grams/ per second was low but itself was functioning fine.
3 times I had to clean MAF sensor to get the intake air temp reading back to what it should.
Only thing I can put this down to is contamination from bushfire smoke.
The other interesting thing is no fault code was logged, so not even the engine light come on. Nothing to even suggest there was an issue. Reason being the MAF sensor was still operating within its parameters.
The only symptom was the DPF going twice as many regen cycles than I would expect it to.
So if you have been driving around in bushfire smoke it would be a good idea to clean the MAF sensor.
Cheers, Spook.
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