I'm in southern california, and today my 88 was in for it's bi annual smog test, it failed on NOX test at 25 mph, with 1032 PPM, ( 706 allowed) not sure what that means, but the car, all of a sudden is showing "set timing mode" on the display as well, it wasn't before I went in, not sure if the tech went into diagnostics and tried to set something? but now can't seem to clear it, and the only codes I get are eo46 and b141 both in history. I just moved last week and unfortunately my service manual is packed away and we haven't opened that box yet so I can't check it.. can you tell me what's happening ?
Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
Re: what is t"set timing mode?
He probably used a jumper wire on the ALDL connector to get to base timing mode and didn't remove it. The under hood decal explains the base timing method. It should also have a wire with a green connector close to the distributor that might also have been disconnected during the SMOG test and needs to be reconnected.
Thanks Carnut, that's exactly what it was. the jumper was in still in the connector under the dash by the hood release, I just never noticed it.. Couldn't find the green connector though. Anyway, now I get to figure out what is out of range causing the excess NOX reading.