Just for history, just cracking 100kmiles on my 90lx, we did the head gaskets last november.. so all the gaskets up that way should be pretty new..
About may or june, this thing started giving me an occasional rough idle with a check engine light.. it grew more consistent over a few weeks, so I pulled the codes..
it gave me a O2 sensor lean code for each side (was it 47 & 97?)..
So I bought new coi, dist cap, wires, plugs, and O2 sensors..
Well I changed it all, except the drivers side O2, which even with the loaner tool for the job, I just could not break loose..
cleared the codes, got the same.. lean on both sides.. well I guess it wasn't the sensor..
But, after than the car RUNS ok, seems to actually perform as it did before.. with the exception of little power from a stop (I'm gertting the idea that's normal) it seems to run fine.. once in a while I will start it and it'll idle like crap until it warms up, but even that's few and far between..
yet now the check engine light is always on.. and it bugs the piss out of me..
since then I've tightened up what seemed to be a slightly loose egr valve from the head gasket job, replaced all the vacuum lines (except the ones entering the firewall, which I plugged off for a test), map sensor, fuel filter.. and then ran out of ideas, except maybe a couple I don't want to face..
I've soaked quite a bit of dough into unrelated things on this car lately, I want it to be 100% so it's not all in vain..
What are my leftover possibilities here? please give me something I haven't thought of..