hello all, i dont post here much if at all, but im after some advice. this is a ems issue, so im posting here and in the megasquirt forum.

i have an s4na high comp. with turbo manifolds and a t04s. i run megasquirt ms2extra with 460/1680cc injectors. i have no vaccum leaks that i know of and here is my issue.

i cant get the idle rpms to drop down. im idling at around 1700-2000 rpms when warmed up. i see a 40-45kpa value when idling. i also have about 17-20*advance around 2000rpms and 45kpa. i tried taking away fuel and adding fuel. i tried moving my spark advance down some too. i do not have any idle control devices at all. any suggestions?

 

mine did this when i first got it, i just messed w/ my idle sensor a little bit.. and it's fine.. idles right at 750..

 

It is obvious that your engine is getting too much air at idle as timing and fuel have lesser affect unless they are at the extreames.

 

do you have thermowax, accelerated warmup system, or a BAC valve?

 

megasquirt has a fuel warmup enrichment phase, but even after that cycles out. no thermowax, no aws, no bac or idle air device.

i do have blockoffs on acv and emissions stuff. im going to check those tomorrow with some propane passes.

off subject, but this is my first vband turbo setup... and my downpipe/turbine connection smokes a lot. like its cooking something off. its ss vband and downpipe, tig welded. but it smokes after the car gets to operating temp and idles high. figured it was just the ss "breaking in" if you will.

 

no vacuum leaks?

 

i decided not to mess with it until after xmas. im busy lately and when i start to work on the car i cant stop. so i just dont have enough time to devote a whole day to it.