Question on O2 sensors and spark plugs
11-08-2014, 02:06 PM
#1
Question on O2 sensors and spark plugs Recently I bought a 2000 Z28 A4 bone stock with 58k miles. I did the slp cold air kit and lid, kooks headers and dual exhaust, and several suspension goodies. I also replaced the spark plugs with ac delco iridium and Msd wires.
When I went to the chassis dyno I noticed the passengers side afr was fluctuating and not like the driver side. The tuner said he believes it's a header gasket leak on the passenger side. I'm pretty sure it's not because all bolts are nice and tight and I made sure to scrape off the old gasket.
I hear spark knocking at times while driving so I'm wondering if it's an O2 sensor or spark plug issue? On the passenger side O2 I did get a little crazy with the anti seize.
When I went to the chassis dyno I noticed the passengers side afr was fluctuating and not like the driver side. The tuner said he believes it's a header gasket leak on the passenger side. I'm pretty sure it's not because all bolts are nice and tight and I made sure to scrape off the old gasket.
I hear spark knocking at times while driving so I'm wondering if it's an O2 sensor or spark plug issue? On the passenger side O2 I did get a little crazy with the anti seize.
11-08-2014, 05:57 PM
#2
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I don't think anti seize is the problem, unless you gooped up the sensor end. Plug in a scanner and check volts to the senors, and they should show a nice sine wave on the graph.