SEDave

Well, I got bored and went ahead and installed the 2 RC 750cc injectors I got a awhile back to see what they would do(the motor's internals are still stock). Wow, what a difference in power and smoothness from the midrange and top end. Although there is a negative, the idle is now poor...like the idle mixture is rich( of course). I've had to retard the lead timing greatly to get it to keep from stalling and adjust the idle speed to no lower to 1K. How effective is the variable resistor at changing the idle mixture? I've set it to all-the-way lean and it still idled like ****. All-the-way rich made it run worse and no setting in between helped. I should get a wideband a/f gauge to diagnose but don't have the money right now. Is there any other way to mess with the idle mixture? I'll probably end up putting the old dirty injectors back in until I tear apart the engine if I can't sort out the idle.



Also, will the intake air temp sensor from a NA S4 work on a S3 if I make an adapter for the electrical connector?

SEDave

I've disconnected the variable resistor and it has helped the idle some. It's still sputtering too much but better.

j9fd3s

you double check it to make sure theres no vacuum leaks?



plan b might be to do something with the afm (you can go in an tighten it up a notch or 2), or maybe the coolant temp sensor for the ecu "hotter" = less fuel

SEDave

Finally, got it to pur. It was the afm. Two notchs on the plastic dial and a retune made it idle better than ever before. It's interesting how that adjustment isn't in the fsm.