What can I do to remedy high HCs in an emisions test?

Question

My 1992 Ford Ranger failed the emissions test due to HCs being above the limit. HC (ppm) limit is 160 and I was at 256. CO and NOx were well within limits. The check engine light's been on for the past 10,000 miles or so and I've had a pretty significant loss of power for about that long - the engine just feels sluggish. Any idea what I can do to fix this without spending a fortune on a mechanic?

Answer 1

Get the codes from the MIL - backtrack the code to the problem. I will bet it's the O2 sensor.

Replace O2 sensor. I would also tune it up while you are at it. New plugs, wires if needed (test them for resistance). Change the air filter. I would do the fuel filter as well. Pop the PCV and make sure it rattles. Replace if it doesn't.

That should fix the high HC count.

Answer 2

might want to get that check engine light looked at. There's a reason that thing comes on. Could be any one of several reasons for excessive HC. The code stored in the computer will be a good place to start. Mass air flow sensor shouldn't cause excessive HC. That would cause hesitation, sag, stumble, loss of performance. If it's a rich condition code, check for leaking injectors or fuel pressure regulator. Could be an O2 sensor. You also have to change your oil before you go for another test. If the engine is running rich, it will dilute the oil as well and this will be a source of extra HC.

Answer 3

Sounds to me like your mass airflow sensor is either dirty or bad. I would have the computer read for the trouble codes. Advance Auto Parts will do this for free and the codes will point you in the right direction as to what the problem is. Its hard to say what th trouble is without knowing what the trouble codes are

Answer 4

http://www.troublecodes.net/Ford/
http://www.therangerstation.com/
Truck's running rich---bad O2 sensor or fuel related problem like injectors or leaks.