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ivantruckman

1991 loyle spfi iac wiring

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The two wire plug to my idle air control valve  .........  the  ground wire was   showing open   .  I had  11.6 volts  to the positive side .  so I just  grounded  the  ground wire  to the engine .  now it has  weird  idle issues .   does the ground wire go thru the ecm .  .  it runs better  un hooked .  just wont idle when cold. and starts hard .   arrgggg.

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Yes,that is normal,the ecm controls it by controlling the ground connection.

Don`t ground it.

 

Check the cts.

Try w/it unhooked.See if that changes the cold idle

w/the IAC plugged in.

Edited by naru

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