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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

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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

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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

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Posted 22 January 2018 - 07:52 PM

Check the cts.

#4 ivantruckman

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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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