1987 190e 2.3 again

[kmaysob]

hello all, i posted a while back about my mothers 190e2.3 failing emissions. the last readings were hc: 03.90 std is 1.60 co: 089.01 std is 15.00 co2: 229.20 and nox 00.33 std is 2.50

i put new wires,cap, and rotor on. the plugs were done a year ago so i didnt see a need to change them. plus they looked good. the cat was bad so i also changed it.

today i took it through emissions and it failed again. hc: 3.90 std is 1.60 co: 77.07 std is 15.00 and nox: 0.61 std is 2.50.

so the hc and nox went up.

i did a compression test and heres what i have:

cyl 1 150psi
cyl 2 125 psi
cyl 3 120psi
cyl 4 125psi.

the compression test was done with a warm engine so im guessing the numbers will be lower once it cools.

can anyone help point me in the right direction on what to check?

any help would be greatly appreciated

[94Wagenmeister]

I probably would have started with the O2 sensor... Also what made you think the cat was bad?

[kmaysob]

i was told it was good. the reason i r&red the cat was because there was no temp. change between the exhaust flowing in and what was flowing out. that told me it was doing nothing. now with the new one there is a change. also, the o2 sensor light has never come on, what does it do? i dont want to sound like i am throwing your advice out the window. does anyone else have an idea? i will check the o2 sensor again

[kmaysob]

anyone?