1997 Volvo 850 non-turbo Running Rich

[gowa_goes]

Hi All -

My 97 850 non-turbo appears to be running rich. There's a smell of fuel coming from the exhaust. The engine is running pretty smoothly (maybe a tiny bit rough?), the tach is stable, acceleration and shifting seem fine, and gas mileage is at about 24 mpg in mostly highway driving. I only noticed the smell after installing this tune-up kit, and for what it's worth I'm a novice mechanic:

https://www.fcpeuro.com/products/volvo- ... tuneupkit1

All info I find pairs running rich with rough idle, poor mileage, or other issues that I don't seem to have. I checked the spark plug wires and plugs and everything is where it should be (though I haven't checked the distributor). Any ideas what's up?

Thanks for any help!

Best,
Steve

[misha]

The main indicator that car is running rich is black smoke from the exhaust and abnormal fuel consumption.