Smog Test Results?
Has any of your Bonnies failed a smog test, and if so, what was the cause/fix?
I'm asking because my '93 SSEi (140,000 miles) is due for a smog test soon (here in so. Ca.) and I just looked at the test results from 2 years ago and noticed that although it passed last time, the HC measurement only passed by 3 PPM on the 15MPH test. At 15 MPH it measured 114 PPM (max allowed is 117) and at 25 MPH it measured 48 PPM (max allowed is 67). Also, at 15 MPH the CO measured .31% (max allowed is .48%) and at 25 MPH it measured .12% (max allowed is .45%).
The catalytic converter was replaced last summer because it rattled when accelerating, and I replaced the O2 sensor with a new Bosch sensor a couple of months ago because the fuel economy was 12 MPG once, and it was a big drop from the usual 16-18 MPG. It seems to be back to getting 16-18 MPG again.
The engine seems to run well, just as it has since I bought it in 1999.
There aren't any error codes.
There'* roughly 2,000 miles on the oil, but I'm going to change it before the test anyway.
What else can/should I do to help ensure that it passes the test?
'99 Bonneville SLE, white, 112,000 miles
'02 Park Avenue Ultra, white diamond pearl, 88,000 miles