Here is my info, car has 246k miles (hopefully i can hit 500k or a million why not? )


With the economy the way it is, I opted to take the car to the test only smog check before a taking it to a shop.

I replaced the sparkplugs a week ago, and also added a can of bg44k around the same time, 133 miles since the bg44k was added.
I didn't do an oil change (it has an external oil leak).
I did warm up the car (drove on on the freeway for about 20mins, and there were two cars ahead of me but one was half way done.
Check engine light does not light up.
Car idles fine, was acting a little rough pre-sparkplug replacement.
Car is driven 120miles on one weekday, the rest of the days either it is not driven at all or short drives to store/post office.

I have limited tools but would appreciate some indication of what might be wrong here, just so I have a better understanding about it when I take it to a shop (and/or in case I may be able to replace some item myself and save some money).

@15mph RPM:1695

HC:181 -FAIL (max is 110)
CO:0.44 - PASS (max is 0.71)
NO:904 - FAIL (max 772)


@25mph RPM:1701

HC:152 - FAIL (max is 85)
CO:0.41 - PASS (max is 0.59)
NO:816 - FAIL (max is 711)



Thank you

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89 300E - 240k +