So, i failed emissions pretty badly........

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  • psloan
    R3V OG
    • Nov 2006
    • 9815
    #1

    So, i failed emissions pretty badly........

    hydrocarbons were a very small amount over what they needed to be - same with low speed nox. high speed nox was double where it should be. Cat looks to be pretty new. I'm going to try new plugs and an air filter and some of that no fail stuff. Any other suggestions?
    "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."
    Tags: None
    • e34john
      No R3VLimiter
      • Apr 2006
      • 3599
      #2
      Was the car hot? I drive my e34 around in low gear to get those cats hot and then right into the testing bay. I read something about adding alcohol or ethanol into the gas, you might want to do a google search or see if anyones actually done it.
      sigpic

        Comment

        • NC325iC
          R3V OG
          • Mar 2004
          • 6565
          #3
          lol i had hydrocarbons of 800+ once, bad o2 sensor
          Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

          Originally posted by TimKninja
          Im more afraid of this thread turning into one of those classic R3v moments, where Pizza gets delivered.

            Comment

            • trent
              #4
              high hc with high nox ends up being either a bad cat, or a cat not warmed up enough.

              Oh, and if you have an aftermarket cat that looks "new" those things are crap.

                Comment

                • jlevie
                  R3V OG
                  • Nov 2006
                  • 13530
                  #5
                  High HC & NOX can be as a result of a rich running engine that causes the catalytic converters to run too hot. The first thing I'd do would be to attack the rich mixture problem. A part of that would be a general tune up (new plugs, air filter, valve adjustment) and a through check for intake leaks. If original, I'd also replace the ignition wires, distributor cap, rotor and O2 sensor. And make sure that the engine is running at normal temp. A bad thermostat can cause the engine to run rich. As can a bad temp sensor input to the DME.
                  The car makes it possible, but the driver makes it happen.
                  Jim Levie, Huntsville, AL

                    Comment

                    • psloan
                      R3V OG
                      • Nov 2006
                      • 9815
                      #6
                      the engine at the time was running too cool. it also sat for half an hour before they ran the test.
                      "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

                        Comment

                        • ivo316
                          E30 Fanatic
                          • Oct 2006
                          • 1222
                          #7
                          Leave it idling during your wait, and make sure the engine is at normal operating temp, You'll pass. ;)

                            Comment

                            • kissinger
                              Noobie
                              • Feb 2007
                              • 8
                              #8
                              I have used avgas (aviation fuel ) it works great to pass smog add 2-5 gal mix.

                                Comment

                                • Tangent
                                  E30 Addict
                                  • Mar 2004
                                  • 476
                                  #9
                                  Originally posted by psloan
                                  the engine at the time was running too cool. it also sat for half an hour before they ran the test.
                                  Both of those are problems. Get it running at the right temp and make sure it doesn't sit before the test. Some of that guaranteed to pass stuff from any auto parts store couldn't hurt either...

                                    Comment

                                    • psloan
                                      R3V OG
                                      • Nov 2006
                                      • 9815
                                      #10
                                      I actually have a source for av gas. Good deal!

                                      Originally posted by kissinger
                                      I have used avgas (aviation fuel ) it works great to pass smog add 2-5 gal mix.
                                      "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

                                        Comment

                                        • MikeE30325i
                                          Banned
                                          • Aug 2006
                                          • 2356
                                          #11
                                          Originally posted by NC325iC
                                          lol i had hydrocarbons of 800+ once, bad o2 sensor
                                          my old camry got 1000+

                                          i was getting the worst gas mileage.

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