» » »

Toyota Q&A

Ask Your Question

1990 Toyota Corolla Question: my 1990 Toyota corollas idle is revving up and down why?

 

Question

Toyota1990, 1.6L 4 Cylinder, Rocky Mount, VA, January 05, 2014, 04:56
 Rookie

ive adjusted throttle cable as low as it will go still high idle and revs up and down

3 Answers
Flag This
  • Answer #1

    January 05, 2014, 05:01
    Profile_thumbnail
     Master

    This may sound crazy but make sure it is FULL of coolant!! Check the radiator and FILL it up! If you need someone to check it out i can do it next week, i am just up the road! Post the results.

    Flag This
  • Reply

    Toyota1990, January 05, 2014, 05:10
     Rookie

    also heater is not working at all replaced thermostat still no heat.Coolant is full think heater core is clogged up also.would that affect idle?

    Flag This
  • Reply

    pushrod, January 05, 2014, 05:14
    Profile_thumbnail
     Master

    The cooling system is not full, you stll have air in it. Let it run with the cap off until the radiator fan comes on. After it cools down check it again. If you need more info post a phone # and i will call, i am just up the road! How far are you from 40 West Food Fair?

    Flag This
  • Reply

    Toyota1990, January 05, 2014, 05:17
     Rookie

    ok thanks, will do let you no if it works/ did what you recommended coolant level dropped very slightly saw some air bubbles escape but not much. topped off radiator. what should I do next

    Reply
    Flag This
  • Answer #2

    January 14, 2014, 21:18
     Master

    Vacuum leak or faulty IAC and blown headgasket by now?

    Reply
    Flag This
  • Answer #3

    January 15, 2014, 04:23
    Profile_thumbnail
     Rookie

    Your Idle valve could be the issue

    Reply
    Flag This
Answer Ranks