I have a 95 pickup with a 302 and a five-speed manual. It has been occasionally stalling and sputtering under load, especially on starting from a standing stop. I pulled the codes, and got 172 and 212 consistently. Can anyone help me figure out what to do to fix this?
Thanks for all your help.

 

use the search feature and search for those codes. you should see lots of info.

 

see http://www.dalidesign.com/hbook/3digit.html You should do more research a bad o2 sensor code does not always mean it's bad.

 

172 (R,M) Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S - Fuel control

212 (M) Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault - Ignition Systems

172- When was the last time or have you ever replaced the oxygen sensor or sensors??

212- I think I have read a post that stated the tach is fed off the coil. You might inspect all your connections and wiring at the coil for anything loose or damaged. Check to make sure you SPOUT (Spark Output) connector is still in place.

 

Thanks for the information. I have never replaced any of the sensors. Where is the oxygen sensor, and how expensive are they?

 

Depending on how many you have they are in the exhaust piping usually before or after the catalytic converter. You can go to Autozones website and enter the year and model of your truck in the repair info section and basically have access to the info that is in a Haynes or Chilton manual. Look in the emmissions section and look for component location. Oxygen sensors should screw into a bung, threaded port, in the piping and have an electrical harness with three or four wires going to it. Some newer trucks can have 2, 3 or even 4 oxygen sensors. Depending on the sensor I think replacement is recommended at 60 to 100K miles. I think they run about $60 each or so. You can check the price on the big "A" 's website after you find out how many you have. Enter truck info and go into replacement parts or search by specific part.

 

That spout connector is pretty important also. It is a shorting plug, that is used to disconnect the timing signals from the computer, anotherwards, if it is missing your computer has absolutely no control over the timing. The SPOUT connector is usually removed to set base timing at 10 BTDC after a distributor repair. there is two wires going to it and it is usually taped up pretty good to the harness going into your trucks computer. The harness(50 or 60 wires) is between the brake booster and drivers side firewall and may be just underneath another connector labeled EEC TEST. I have seen spout connectors that have been left hanging with broken tabs on the plugs and had nothing left to hold them but the strength of the internal metal spade connectors.