So i have a 92 S with an H22, and i was using the stock fuel rails and decided to change it out to a different year between 92-96 fuel rails. My stock rails and injectors worked fine, but wanted to just see if it would make a difference by jus driving it. All was good for a while, now my exhaust smells RICH after the car sits there idling...so my question is WHAT WOULD CAUSE THE CAR To SMELL RICH at IDLE??

 

Stock H22s run rich anyway. And the fuel rail isn't going to change that, the FPR might though.

 

It could just be you need to retighten the fuel rail bolts more. Those things need to be pretty tight or they will leak.