I've read many M103 reports on here so I wanted to post an update.

Last year, my car barely squeeked past the NOX test by 2points(1047 allow/1045). HC was high and CO was fine(O2 sensor still working I guess) I was concerned because it had about 7,000 miles since the last tuneup which include rotor/cap/and wires.

So, I thought about it all and kept smelling the exhaust with the car hot.

I decided it must be slightly rich, but the O2 sensor was working. I measured 3.5k ohms on the temp sensor(bad sensor -replaced). Then, I did 2 tanks with Techron fuel additive good highway speeds.

Changed the plugs and put a new O2 sensor in the car(hey 86k is enough on the old one and it was $40), changed the oil. Grand total $130 for everything.

Results- amazing!

HCppm 18/21
C0 % 0.02/0.05
CO2 dont remember
NOX 216/312 (1047 allowable).

Hope this is encouraging for others.... I'm in Texas!


Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E

Which temp sensor did you look at? My '87 has squeaked past the emissions test here twice in a row, and I'd be interested to see if I can get it down reasonably.

http://www.peachparts.com/shopforum/tech-help/117048-successful-ca-asm-emission-test-ke-fuel-system.html#post833484

Temp sensor you want is for the KE injection system. Last one on the head beside the lifting ear.

Make sure you get the cat screaming hot too. I drove mine down the freeway for a good 15 minutes in 3rd, then it went straight into testing- no waiting. I ran inside with the car idling and the lady came out and started the test.

Actually, NOX was 86/316 (allowable 1047/1145)

Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E