Smog help!!!!!

87-POSupra · 12-22-2010, 04:36 AM

i have an 87 supra. i put a 91 motor in and a new catalytic converter. its a non turbo automatic with no mods. it passes perfectly at idle but off idle it fails, not by much but it does. my first thought is to change the ECU considering that the intake manifolds are different which could cause a different air fuel mixture. what are your thoughts????? another tid bit of info is that the car is originally from washington. not sure if it makes a difference but any info you could give is much appriciated. thank you.

12-22-2010, 04:36 AM	#1
87-POSupra Stock Join Date: Jan 2008 Location: washington Posts: 16	Smog help!!!!! i have an 87 supra. i put a 91 motor in and a new catalytic converter. its a non turbo automatic with no mods. it passes perfectly at idle but off idle it fails, not by much but it does. my first thought is to change the ECU considering that the intake manifolds are different which could cause a different air fuel mixture. what are your thoughts????? another tid bit of info is that the car is originally from washington. not sure if it makes a difference but any info you could give is much appriciated. thank you.