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I guess I would start by seeing if there is voltage in the harness going to the O2 sensors. If not, it could be the ECU is dead. Is there a fuse or relay for the ECU? What do the voltage graphs look like for the sensors, before and after cats? The befores should look like a sine wave and the afters should be pretty close to a straight line.
Then, I would swap out the MAF with a known one to see if its good. There are also a couple of diagnostics for the MAF on the duramteric, voltage, I believe and maybe resistance.
Do the MAF values vary at all upon acceleration?
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
Last edited by san rensho; 04-10-2014 at 04:01 PM.
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