My E failed smog. 113,000 miles. It passed at 15 mph, but failed at 25 mph. Didn't fail by much. No codes on the computer. I've noticed a slightly rough idle recently.

The smog guy suggested a new O2 sensor and plugs. He also said that the catalytic converter rarely goes on these cars.What to do? Shell out the $150 for the sensor? I'm lost.

Thanks.

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1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.

I'm sure Duke will be along shortly to interpret your test, so I'll say it now - post the numbers from the test results, and if it all possible the numbers from the prior test (2 years ago).

It is impossible to even venture a guess without seeing any numbers.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.

Here they are. 2 Years ago, no dyno test, this year it was.

2 Years ago:

HC:
647rpm: 12
2556rpm: 13

this year:

15mph, 1446rpm: 46
25mph, 1258rpm: 64, allowed is 47

Craig

__________________
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.

I don't know if there is anything wrong with your car until I see the COMPLETE test results.

Read the following thread, and the thread it refers to, then post your complete test results in the format I used. You will know enough by then to do your own analysis, so tell me what you think, and I will give you my comments.

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

Duke

If you were close I'd be willing to bet that you would pass with either 1) new plugs, or 2) a bottle of "guaranteed to pass" (follow directions). Do both 1 and 2, about $20 total and it won't even be close.

OK, here goes again:

2 years ago:

RPM: 647
CO2% Measured: 15
O2%: .1
HC, Max: 100, AVE: 17, Meas: 12
CO% Max:1.00, AVE: 0.00, Meas: 0.00. PASS

RPM: 2556
CO2% Measured: 15
O2%: .2
HC, Max 130, AVE: 12, Meas: 13
CO% Max:1.00, AVE 0.10, Meas 0.02 PASS

Last week:

RPM: 1464, 15 mph.
CO2% Measured: 14.4
O2%: .07
HC, Max 81, AVE: 21, Meas: 46
CO% Max: 47, AVE 0.05, Meas 0.09
NO: Max 685, AVE:150, Meas: 283 PASS

RPM: 1258, 25mph.
CO2% Measured: 14.3
O2%: .1
HC, Max 47, AVE: 12, Meas: 64 FAIL
CO% Max: .44, AVE 0.05, Meas 0.14
NO: MAX 696, AVE: 136, MEAS: 270

From your write up before, it looks like my cat was warmer 2 years ago that it was last week.

__________________
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.