2G isc motor help

[chasedardis]

I have tested my isc and it is showing 42.2ohm for all the plugs. When the isc was plugged in the car would surge down to about 200 rpm then up to 1100 repeatedly. when i unplugged it, the engine idles fine at about 1100 which is what my target is. I have v3 on sd with sensors, big 16g,fpr, fmic, greddy blow off, pte 880s, and 6 bolt swap. Im just wondering if the 42.2 ohm is to much because its supposed to be around 30. Any help would be nice.

 

[3kgt2nv]

according to the vfaq about idle surge values above 30 usually indicate a bad iac motor,

 

[steve]

With DSMLink you want to be logging ISC steps to see if the ECU has tried moving the pintle all the way in or out attempting to control the idle speed.

What the correct coil resistance is, depends on the version of the ISC and the temp when you measured. I'm less worried about 42 ohms when you read that from each coil if it's a black plastic ISC than if it was just one coil in an old metal ISC.

Keep in mind that if you raise the idle speed that far from the factory 750 +- 50 RPM you also need to change the trigger point for decel fuel cut off (Coasting FC Offset) or you can force the engine into surging. Some other suggestions on the ECMLink wiki idlesurge [ECMTuning - wiki]