Hi guys, what should IAC counts be.. I am having a bad surging problem, I have a mail order tune, but I am getting a dyno tune in a couple of weeks. my iac counts are as follows.. in idle in park closed loop.. around 65-75 varies on temperature. warmed up closed loop in gear foot on brake 160.. I drilled a small hole in the t.b. plate I have a 58mm. holley.. my car is a speed density. it was 160 in park closed loop but now around 65 ,but in drive and foot on brake 160. do I need to adj. more? or should I wait for the dynotune, and can he change. I have a autoxray scanner. not sure what counts should be and why the big diff. from park to drive.

 

The IAC is only to control the idle. It has no effect off idle. Most folks say that the counts at idle should be 30-40. You can enlarge the holes you drilled in order to accomplish this. I drilled two 5/16 holes in my 58mm tb and it idles great. You cannot even tell when the a/c kicks on.

As for the surging problem. I believe that this represents a lean condition and can be cured by adding fuel in the area where it occurs. Good luck.

 

thanks string..I have a dynotune coming on the 15th. hopefully I can get it straightened out...