the problem with AFR

Discussion of tuning specific to CX-7 vehicles
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Nxnos
Posts: 6
Joined: June 20th, 2016, 4:11 pm

the problem with AFR

Post by Nxnos »

Hi all. Mazda cx-7 1st Gen. Sometimes the testimony of Actual equivalence air to fuel ratio (λ) grow up to 1,992. What could be the problem? Lambda was replaced by a new one, but the problem remained.
Thank you all, I attach the Log
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Data log.csv
Log File
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Steve @ VersaTune
Lead tuner
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Joined: March 29th, 2010, 12:58 pm

Re: the problem with AFR

Post by Steve @ VersaTune »

The ECU cuts fuel on deceleration for fuel savings and reduced emissions. When that happens, the O2 sensor sees lots of oxygen. This is normal.
Nxnos
Posts: 6
Joined: June 20th, 2016, 4:11 pm

Re: the problem with AFR

Post by Nxnos »

Thank you very much. Maybe even tell me when I stopped, keep your foot on the brake, but there was a sharp jerk of the car. What could be the problem?
mituc
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Joined: December 17th, 2011, 2:47 pm
Location: Iasi/Romania

Re: the problem with AFR

Post by mituc »

Is it just me or the above posted log is absolutely and totally fucked up? Can you try to re-post is, please?
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
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Steve @ VersaTune
Lead tuner
Posts: 1157
Joined: March 29th, 2010, 12:58 pm

Re: the problem with AFR

Post by Steve @ VersaTune »

I think it has to do with the decimal and thousands separators used. After a bit of tweaking, I got the log to work in Libre Office Calc.
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