1999 Ford Ranger smog test

I understand your frustration, and thank you for donating. The OBDII requirement for the monitors to run to completion is slightly different for every vehicle manufacturer. Typically it requires running from cold, allowing it to idle for a period of time(usually just a minute) and driving the vehicle for about 20 minutes without exceeding a pre-determined engine speed(3000 RPM) My method usually involved a run on the freeway for 10 minutes, get off and drive city streets for a mile or so and back on the freeway and back to the shop, and by then the required number of monitors would run to completion and I could smog the car. To exceed the requirements or in other words to go too fast or rev the engine too high cancels the ability to complete the monitors for that drive cycle. Having said that, I do not know what is on the instruction sheet they supplied you at the smog station, I am going to guess it says the same as what I just said. If the monitors will not run to completion, there may be other factors I am unaware of. I invite our other moderators to join in to the conversation in case there is something I am overlooking, hang in there mate. Ã â Â

There are only a couple of things I can suggest to do with this problem. I do not know Fords that well to begin with although I worked on them for a long time. But the only thing I can tell you is to clean your all your grounds that you can find, especially the engine and body grounds. This could be preventing your computer to read correctly. Also if that doesn' thelp you may have to drag the truck back tot he dealer and see if they can reprogram your computer, especially if you have added on one of the aftermarket computer reprogrammers.

Even a blind squirrel finds a nut now and then.