emissions failure 1992 300 sl

[edcarls]

Originally Posted by po7553po

OK here are the results from the test-

Test Parameter Result Additional info if available
--------------- ------------ -------------------------
IDLE SPEED CO 2.08% Greater than 1.20%
IDLE SPEED HC 778 Greater than 220 parts per million
HIGH SPEED 265 Greater than 220 parts per million

I dont know what they mean but hear they are.The car is a 1992 300 SL-24 with 195,000 miles.Never had test in Nevada before but passed emissions in Ct in 2011.Did head gasket 2 years ago.Thanks for the help.You guys are the most helpful people I have ever dealt with.

Looks like you have a rich mixture which produce unburned gas as shown by the high CO results. This also influenced the high HC PPM reading.

You need a complete tune up; plug, cap, wires and on a 92 IIRC you can manually adjust lambda (fuel/air mixture) close to 50%. Worst case you my need to replace your O2 sensors and cats if HC is still above specs.

[grumpy old man]

Don't know about the CO but with the high HC, almost anything will pass with a new cat. Check around and see if there is an inexpensive aftermarket cat for it. I have had a few beaters in the past, come test time I would put in a good cat I kept in the garage and take it out after the test and keep it in the garage for the next test. I am dreading my next test because I think the AIR passages in the heads are plugged. I keep getting an air injection code, and I am not looking forward to r&ring the heads.

[po7553po]

Thanks so much for the input.I will start right away on trying to remedy my problem.I will let you know I made out.

[po7553po]

Just wanted to let everyone Know I passed the emission test.All I did was use crc-05063 in the fuel tank.I had my doubts but I put it in tank and filled it up with gas drove around for a couple of hours.Went to the smog test and I passed and if you read my failure stats something made a big difference.Thanks again for the input you guys are the best.

[Pete S]

Glad it worked for you also! Thats now 2 people I know that it worked for and I'm guessing there are many more.

[RKH]

Originally Posted by po7553po

Just wanted to let everyone Know I passed the emission test.All I did was use crc-05063 in the fuel tank.I had my doubts but I put it in tank and filled it up with gas drove around for a couple of hours.Went to the smog test and I passed and if you read my failure stats something made a big difference.Thanks again for the input you guys are the best.

How much margin did it passed with ? (before and after #'s).

[po7553po]

I dont know the numbers from the test that passed.They only print out the numbers if you fail.Thanks again everyone