Technically speaking

[mackgoo]

I'm trouble shooting my CEL. I've mostly been getting 1123's and 25's, once I got 24 and 26. I've disconnected the MAF, the car runs much better when cold. It used to be until it warmed up it stumbled at around 2K. So technically speaking with the MAF disconnected and if the problem was related to another fault in this condition would I still be able to get the lean/rich faults?

As a side note what should the O2 sensor voltage look like graphed?

[Loren]

Well, the P1123 and P1125 are almost opposite to P1124 and P1126. A P1123 and P1125 are too rich conditions - that is, the DME can not lean the mixture enough. P1124 and P1126 are too lean and the DME can not make the mixture rich enough.

If it were always P1123 and P1125 then the OBD II manual says check the fuel pump pressure and the EVAP canister purge valve (open).

Any changes recently like air filter or fuel filter? and are those codes with the MAF disconnected?

[mackgoo]

Well, the P1123 and P1125 are almost opposite to P1124 and P1126. A P1123 and P1125 are too rich conditions - that is, the DME can not lean the mixture enough. P1124 and P1126 are too lean and the DME can not make the mixture rich enough.

If it were always P1123 and P1125 then the OBD II manual says check the fuel pump pressure and the EVAP canister purge valve (open).

Any changes recently like air filter or fuel filter? and are those codes with the MAF disconnected?

<{POST_SNAPBACK}>

Right now the only code I get is 102 or something like that. Recognizing no signal from the MAF. It's only been a few days though. What I'm wondering is, if I understand correctly with the MAF disconnected the computer goes to some default programing. In this default programing mode would the lean/rich conditions still be achieved?

Also any one have an idea what a graph of a correctly functioning O2 sensors voltage should look like?

[Richard Hamilton]

If it is the same as the 996, the output voltages from the O2 sensors should be between 0.04 and 0.79 volts.

DME_Setpoints.pdf