Failed SMOG High NOX at 15mph

[cdmcali]

Hey everyone,

I went to go get my DeLorean smogged last weekend and it failed the 15 mph NO test. It measured 1269 aand the max is 1148. In the 25mph test it measured 935 with a max of 978. The tech recommended that the O2 sensor be replaced but that was already done about 2 years ago. I took it for a good drive before the test to get it nice and warm. Any thoughs on what could be causing the issue or how to get it to pass. 2 years ago I had the engine tuned up at DMC california and haven't noticed any issues with it. Thanks in advance! 0011_001.jpg

[David T]

Get a fresh tank of gas and run a can of Techron through the motor. If that doesn't work you may need to go back to DMCCA and get the car tuned up.

[cdmcali]

Get a fresh tank of gas and run a can of Techron through the motor. If that doesn't work you may need to go back to DMCCA and get the car tuned up.

Thanks David. Do you have a link for the Techron you recommend? Also, would running a higher octane just for the test help?

[David T]

Any large automotive supply should have Techron. Higher octane won't do anything but fresh gas (the right octane, regular) certainly will.

[Ras12]

I never believed in additives and always thought they were gimmicks. Then I had a check engine light, it was running rich, and didn't pass inspection on my 2007 Yukon Denali. The sales person at O'Reily Auto encouraged me to try SEAFOAM in my gas, crankcase and more importantly trickle a full can down into the engine via the brake booster vacuum line. I did this and remarkably it ran 100% smoother and passed inspection with flying colors. I tried it on my Delorean with the same results. One word of caution, when you add the additive and drive the car you need to get on the highway or rev it up and you will create a smoke screen of white smoke. Check out some SEAFOAM videos on YouTube and you will see what o am talking about. Good luck!

[David T]

A Delorean's fuel system is nothing like a 2007 Denali's. All you have to do is clean up the mechanical fuel injectors to get a better spray pattern. It also doesn't
have to meet as stringent a standard as the 2007 does. Seafoam can also work but I don't have a lot of experience with it, I do with Techron.