1987 Mercedes Benz 190e smog test failure

Ok first do you have the read out of the HC's and Co's and Nox? If so get me the readings so I can better help also include what it should be so I can see how far off it is. With readings I can see how rich or lean it is running to give you better suggestions as what to check or do to get it to pass.

HC
max @ 15mph is 118 - measurement is 455
CO
mas @ 15mpg is 0.75 - measurment is 0.59
NO
max @ 15 mph is 799 - measurement is 2218

hope this helps answer some questions for you. i did not realize i needed to come back to your website for a response. i thought it would be sent to my email address. thanks for any help

OK I would do some simple maintenace stuff there. The Co's are not that far out of place only by .20 so with that. If the oil is old change it with the filter and make sure the air filter is clean and put some seafoam in the gas tank and then go back with it well warmed up and smog it and it should pass from what I am reading anyway. Let me know how it goes and have a great day.

thanks for the help. the other readings being so high do not concern you? also, do you guys have a shop in Orange County where I might bring my car for work?

Thanks

I have my shop in North Idaho so not me anyway but I did do smog in cali and was a vehicle inpector for the state too funny. Now the other reading are a bit high and I would double check for any vacuum leakes in the intake system too. However basic maintance is a common reason why cars fail but make sure all the vacuum lines are good and not cracked and use water and spray around the intake and such. This is injected right so check for vacuum leaks around the injectors too. Let me know what you find.