obd says running rich

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SRATLIF
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96 chevrolet silverado 1500, 160000miles.the check engine light says running rich on bank1&2. replaced fuel reg. air filter,fuel pump.plugs,wires,cap,etc, motor also idles a little rough like its missing . motor runs fine going down road etc. starts fine. fuel mileage about 18 mpg. also installed 2 new cat conv. cant seem to pinpoint the problem can you help?
Jun 13, 2006 at 9:57 AM
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DABOSS
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running rich means there's too much fuel going through or the right amount of fuel going, but not any or enough kind of air going in, so you got an air restriction somewhere, air filter replacement is right, but there's more than that, like the air intake needs to be cleaned out, or a fuel problem were too much fuel is going through. your gaskets could be a problem too, but I can't pinpoint which ones. check the exhaust system, there's bound to be a problem there.
Jun 16, 2006 at 11:01 PM
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JAMIE LAWLESS
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Have a look at what your O2 sensor is reading. it should be bouncing roughly between .2 - .8 volts. it makes voltage in the absence of oxygen so try and force it lean by removing a vacuum lne from teh intake and wach the voltage it should drop way down.
Jul 16, 2006 at 5:40 PM
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