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Guest Message by DevFuse

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1991 loyle spfi iac wiring

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3 replies to this topic

#1 ivantruckman


    4 inch lift

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  • caro, MI.

Posted 22 January 2018 - 03:42 PM

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.

#2 naru


    1000+ Super USER!

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  • under the bridge

Posted 22 January 2018 - 04:09 PM

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, 22 January 2018 - 04:11 PM.

#3 DaveT


    Subaru Nut

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  • Colchester

Posted 22 January 2018 - 07:52 PM

Check the cts.

#4 ivantruckman


    4 inch lift

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  • caro, MI.

Posted 23 January 2018 - 08:53 AM

Its likely the the wire on the engine harness  is broken .  Ill have to trace it .  Thanks  all  .

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