Guys ive had an idle problem ever since I switched over to speed density. Car will idle very high like 2000 rpms then drop for a second then shoot straight back to 2000rpms.

When the IAC is disconnected and closed the car idles perfectly. No jumping or dropping in rpms... When the iac is disconnected the a/f is still around 14.7 ish.

I did plug the iac in one morning for warm up. It idled at 1300 (which is what is set in the map) until in warmed up then shot straight to 2000 rpms??

Do I have a leak at the IAC?

 

Anyone???

 

Have you done much tuning in the past? I would suggest PMing gearhead on here. He has a lot of tuning experience.

 

I tuned my old 03 got 557WHP on 110 oct. I have an evo IX now and it seems to be a pain, after I changed to speed density it's been horrible. Thinking about throwing the MAF back on.

 

Which Rom did you get for SD? 88580015 and V7 right?

plus double check IAT settings to use IAT sensor and not the Fuel Temp.

https://www.evolutionm.net/forums/ec...t-options.html

 

Ok will do...

 

Problem solved! Wrong addresses in the MAT Table!