emission test trick

Feb 04, 2004 1 Replies
W

I can't remember what website I saw this on but a dirty engine can cause a car to fail an emissions test. In this case the oxygen sensor was dirty and had to be replaced but that was not enough. The hoses to the PCV valve and the EGR valve and the EGR valve istself had to be replaced before the car passed the test. The catalytic converter was good and did not have to be replaced.



I wondered how dirty my engine was to I took off the PCV valve and swabbed the inside of the hose with a cottom swab (eg Q-tip). It came out clean so maybe my EGR valve and Oxygen sensor are clean too. :)


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D

Remember a stuck clean egr will fail to. In a 86 toyota cressida it shows when trying to accellerate hard on a cold engine. It hesitates alot. A new converter cleans the s*it out of a engine that marginally failed at times. Interesting point my 79 cressida passed smog back then without the coverter innards (was emptied out, that type was the beads) adavanced timing will fail the cleanest of all cars to.

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