Quote Originally Posted by TommyD1919 View Post
got a chipped and socketed p28
A P28 doesn't look for a knock sensor anyway... I can't remember if it uses the IAT sensor or not but if it does then the IAT needs to be in place because it works directly with your fuel and timing maps. I would check your map sensor and fuel pressure.. Also what is the P28 tuned for?[/QUOTE]

if the knock is enabled on a chipped p28 it'll throw the cel right away since it doesn't have the circuitry for knock.

they do have iat and you are correct that it needs to be plumbed into the intake or intake tube so the enrichment tables will do their job as nec.