misfire at idle, failing CA smog help

under the radar · Post by **under the radar** » Tue Jul 16, 2013 10:36 pm

my 79 528i has a slight misfire at idle causing it to have high HC (260ppm, max allowed is 220)

car otherwise has a steady idle, good cap n rotor/wires.

just looking for some ideas of where i should start.

alotawatts · Post by **alotawatts** » Tue Jul 16, 2013 11:12 pm

http://www.smogtips.com/failed-high-hydrocarbons-HC.cfm

under the radar · Post by **under the radar** » Wed Jul 17, 2013 12:49 am

thank you, but i'm aware of the basics. i am hoping for something more specific to E12s with L-Jet.

Mike W. · Post by **Mike W.** » Sun Jul 21, 2013 12:04 am

Is it a miss or a hunting idle? The latter is what it should be, not smooth. On a 528i if you have a miss it is probably a component problem, ignition parts. And you didn't mention what the biggest troubleshooting tool says, the O2 sensor.