Chevrolet Repair: 92 chevy cavalier, crank shaft position sensor, vacuum leaks


Question
QUESTION: wont stay running replaced feul filter,both coils, feul pressure regulator,plugs

ANSWER: Hey,

  Check the Idle air control motor.  It is responsible for idle.  You didnt really elaborate on the condition so I assume it is stalling yet starts right back up?

Wayne


---------- FOLLOW-UP ----------

QUESTION:  car is in good conditionalso has new feul pump.can you clean the idle air control valve and if so what with?

ANSWER: Hey,  If you remove the two torx screws holding it on take it out and clean it with air intake cleaner.  Clean the throttle plate and body at the same time.  Inspect the valve and make sure it isnt stuck or gooed up too badly.  If you introduce a vacuum leak to the engine and it idles it may have a defective valve that is not retracting.

Wayne


---------- FOLLOW-UP ----------

QUESTION: Wayne i unplugged idle air control valve.The idle went way up and when i plugged it back in it went back to normal.Could the crank shaft position sensor have anything to do with the stalling?

Answer
If the crank sensor is weak enough and not able to send a signal to the PCM the fuel will be shut off.  You should get a code reader and check system for codes.  It does sound like a problem with the Iac circuit though. Check closely for vacuum leaks and have a mechanic check the datastream for sensor problems.

w