How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Shawn Your Own Question
Shawn, Auto Service Technician
Category: Ford
Satisfied Customers: 3756
Experience:  16 years experience Ford,Nissan and Honda dealership in all areas
Type Your Ford Question Here...
Shawn is online now
A new question is answered every 9 seconds
This answer was rated:

I have a 1993 Ford Tempo, 2.3L engine. I am having a high idle

problem.The cars runs great at... Show More
problem.The cars runs great at highway speeds. I checked for vacuum leaks and could not find any. The exhaust does not have a rotten egg smell. There is a low pitch vibrtion sound coming from the throttle body area. If i remove the intake hose between the throttle body and mass airflow sensor the engine idles down but surges some. There is no check engine light but i don't think it works. Could the mass airflow sensor be bad?
Show Less
Ask Your Own Ford Question





Thank you for asking your question on JustAnswer. The most common cause of the problem you are having is a sticking or defective IAC (Idle Air Control) valve, located on the throttle body of the upper intake manifold, I can send instructions on how to replace if you need me too.


Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.

Customer reply replied 6 years ago.
yes, please send the instructions on how to change it. Thanks





Thank you for the prompt reply, here are the instructions below, hope this helps you out.



Idle Air Control (IAC) Valve Assembly


  1. Disconnect idle air control (IAC) valve assembly connector from wiring harness.
  2. Remove two idle air control (IAC) valve retaining screws.
    NOTE: If scraping is necessary, be careful not to damage idle air control (IAC) valve or throttle body gasket surfaces, or drop material into throttle body .
  3. Remove idle air control (IAC) valve and gasket.



  1. Ensure that both intake manifold and idle air control (IAC) valve gasket surfaces are clean.
  2. Install gasket on intake manifold surface and mount idle air control (IAC) valve assembly securing it with two retaining screws. Tighten to 8-11 Nm (71-97 lb-in).
  3. Connect electrical connector for idle air control (IAC) valve.




Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.