What if the OBD2 hook up for the car does not show air fuel ratio (like when hook up for a Japanese car) but shows MAF value. The old car only has one O2 sensor located just after the exhaust manifold and well before the cat convertor. The car is 1.8 liter x 750rpm/2/60 x corrected air density at 7.35psi & 100F = 5.7g/seconds. Since the intake valve closes off only at about 60 degree after BDC, of suction stroke, the dynamic suction stroke taking 4.7g/second of air appear to be very accurate. At 2000rpm & 49mph the MAF is 18g/second at -1.5 to -3 psi vs 23g/second by calculation. No idea in Egr % opening as OBD2 could not show this. O2 sensor reads at about 0.75v. I like to learn more.
Hi, what are the readings for a dead catalityc convertor on a good engine in perfect condition? And what should be the readings for a efficient catalyst?
Wow, this is good video. Wonder what is the Egr opening and it's dilution effect onto flame speed during combustion or power stroke. At CO2 of 7% this indicates fuel is not being properly burnt off. Maybe timing of ignition spark is not been sufficiently advance?. Like ignition spark initiated only after TBC of compression stroke instead of 20+% before TDC?.
