sdmartin65

So I just installed some GT40 heads and mustang gt cam. Cam specs are 460 lift, 220 duration, 116 lobe seperation with 6 degrees advance built into the cam. I also advanced the cam 2 degrees with the timing set. When I had it apart I cleaned the IAC with carb cleaner. It runs great and idles solid at 800 rpm but seems to have a slight lope.

I really didnt think Id get a lope from this cam setup! So what do you guys think, is it a lope or a pooched IAC?

dr_bowtie

anything over 216° duration on a small cubic inch engine is the point you'll nice idle characteristics. You also should see where the O2 sensor range is so you'll know if it is a Lean surge issue or rich surge... it is important to check the Idle vacuum to see where you are. Also witht eh vacuum gauge you can see if the needle is steady or spuratic noting a possible vacuum leak.

sdmartin65

Took the IAC back off and lubed with white lithium grease. That fixed it. The truck does have an ever so slight lope with the cam I installed.

dr_bowtie

good deal