Question about 1991 Nissan Stanza
Car is fuel injected with 4 separate injectors, no mixture adjustment. The ignition system checks-out, no MAP sensor on this model either. As mentioned in previous question, the car is running too rich, idles too slow, and knocks-off when put in gear. Timing is good and compression is excellent. If I can, will dig out ECM and run diagnostic to see if there's a sensor failure and pray it doesn't cost TOO much. Have tech manual on the way. For some reason parts and info for this particular Nissan either are hard to get or have to be ordered and take a while to get. Dealers=OUCH!
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Posted on Jan 02, 2017
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Here's what we think may be wrong with your car and what may be causing it. The list goes from the most likely problem to the least likely. Check out our Product and How To pages or the Vehicle Repair Guide for your vehicle (if available) for more information about particular parts.
Keep in mind, this is a general diagnosis. Your car may not have the parts we list as potential problems. If you're not sure if your car has a particular part, check your owner's manual.
--> Smells Like Change Symptom: Sulfer Change When: Engine Idling Change Where: Engine Exhaust Change -->
Priority Action Part Type Cause 1 Inspect OXYGEN Sensor Damaged or Faulty OXYGEN Sensor or Circuit. 2 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter. 3 Inspect Fuel Injector Pressure Regulator Faulty Regulator/Weak Spring Causing a Rich Fuel Mixture. 3 Inspect MAP Sensor Faulty or Disconnected MAP Sensor Causing a Rich Fuel Mixture. 3 Inspect Coolant Temperature Sensor Faulty or Disconnected Coolant Temperature Sensor Causing a Rich Fuel Mixture. 4 Inspect Carburetor Incorrect Carburetor Adjustment. 5 Inspect PCV Valve Plugged or Damaged PCV Valve.
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