cardoc· Premium Member
01 VDC, 05 R Sedan, 06 BAJA EJ257
Here's what I see.
Does anything look obviously wrong?
Fuel Trim Bank 1 Long Term = 7.03%
This is what the ECM is adding in fuel in addition to its base fuel map based on the data it recieves.
Fuel Trim Bank 1 Sensor 1 = -5.47%, -4.69%, -3.91% (fluctuated between these a couple times, or really really close)
This is the amount the ECM is calculating in fuel reduction to bring the AFR to a correct level. It derives this number from data received from the AF sensor.
Fuel Trim Bank 2 = 0% Ignore this
Intake Manifold Pressure = 4.5psi
This is a problem. MAP data should be about 8-9 psi. This number is telling the computer that vacuum is low, so air flow is high and its matching for higher amounts of air.
Mass Air Flow = 3.2-3.3
Your car doesn't have a MAF so the ECM calculates air flow based on BARO, MAP and IAT data.
Timing 15deg @ idle Normal
Turbo Boost & Vacuum 10.35psi (but I dont have a turbo) Software glitch with you scanner?? I think this would be the relative manifold pressure while the above MAP number is absolute.
Here is an O2 graph while idling, red circle at top was a real quick tap of throttle and two at bottom were longer and a little more throttle.
This is indicative of a failed CAT. The waveform is similar to STFT changes made by the computer in managing combustion and temperature. The CAT is not reburning the exhaust. The throttle tap was the ECM adding fuel to compensate for the throttle position. The longer throttle hold where its on the low side was the computer pulling fuel trying to adjust the AFR.
I do believe your CAT is bad. What killed it is an overly rich running engine. Your MAP sensor is sending improper data.