kat problems w/ safc

[96s14kat]

for almost a year i ran my kat with a hacked mafs setup and 370 injectors. just recently i installed a safcII and i also switched to a open atm. bov. i went to start my car after installing the safc and it will not idle and it doesnt seem like it runs right. here are the settings i have my safc set at. sensor type: hot wire, 5in 5out, sensor cal. 1in 1out, and i set the dec. air settings to 1.0, 1.0, 1.0. after driving it i doesnt seem like its runs like it used to and it dies everytime i let off the gas. sometimes it will barely idle, at like 500rpm and it jumps up and down almost dieing and then it eventually dies. i checked the plugs after just driving it for a few minutes like that and they were totaly black, but not wet. i dont know what else to do, because it ran fine before i installed the safc and switched to open atm. bov.

[Maeda]

heh heh heh
KA-t syndrome.

Recirc the BOV, tighten it up in case its leaking, or buy an emanage my friend.
You could try just not hooking up the BOV and seeing if that does it?
And if it doesn't then it must be an s-afc setting.
How far is the maf from the turbo inlet?

Beyond that I'm sorry I can't be of more help.

[96s14kat]

mafs is probably 18-20 inches or more from turbo. im using a 1st gen dsm bov.

just checked my cel codes and i got a few. here they are:
21) Ignition signal in primary circuit not being entered to ecu during cranking
25) Idle Air Control Valve
81) Vacuum cut bypass valve
87) EVAP canister purge control
91) front O2 sensor
93) EVAP canister vent control valve
132) not sure what this is

im now thinking it has something to do with the dec. air settings, because i pulled the vac. hose off my bov and plugged it. then i started the car and it idled ok. then i put the hose back on the bov and started it back up and it idled bad and died when i gave it some gas and let off. anyone have any ideas what i should try for the dec. air settings? i had it at **, 0,0.

[Maxtype 240]

Start w/ the simple stuff in this order:

1. Make sure you're BOV is fully closed during idle. (Hold your hand to it to verify)

2. Ensure all your seals are good, no vacuum loss.

3. Up your DecAir settings, 1.0, 1.0-2.0, 2.0-3.0. Once it idles nice, rev it high and adjust the last number higher to keep it from dying.

Jesse

[96s14kat]

Start w/ the simple stuff in this order:

1. Make sure you're BOV is fully closed during idle. (Hold your hand to it to verify)

2. Ensure all your seals are good, no vacuum loss.

3. Up your DecAir settings, 1.0, 1.0-2.0, 2.0-3.0. Once it idles nice, rev it high and adjust the last number higher to keep it from dying.

Jesse

hey thanks a lot, i will try those things, i do think my bov may be opening when i start the engine and maybe during idle. does this mean i have a bad bov. it is a 1st gen dsm bov.

[Maxtype 240]

hey thanks a lot, i will try those things, i do think my bov may be opening when i start the engine and maybe during idle. does this mean i have a bad bov. it is a 1st gen dsm bov.

Determine if it's adjustable (harder/softer). If so, tighten the spring to make a good seal during idle.

[orion::S14]

Vacuum is sucking the BOV open, allowing unmetered air in.

ALlit takes is 16-17 inches of vacuum to fully open a 1G DSM BOV.

You need to crush it to hold the valve closed under +21 inches of vacuum, or recirc it again.

No amount of messing with the AFC will help if the BOV is allowing tons of unmetered air to come in...

- Brian

[96s14kat]

thanks orion, that is kind of what i thought was happening. how do i go about crushing the bov? from the looks of it, it doesnt look like i can take it apart at all.

[orion::S14]

No, you just crush it. In a vise.

Get a vacum pump w/ gauge, and see where it opens now (BOV off the car, just connect the pump to the port ont he BOV and pump the air out...you'll see the valve start to lift off the seat). Probably between 15-17 inches.

Put it in a vise, and crush it (top to bottom) a little, then retest. Keep crushing until it takes ~20 inches to open it.

Only issue here is that while decel in gear, the vacuum is over 25 inches, and will cause the BOV to suck open still, and make lots of backfiring and popping until you push in the clutch.

It really is best to just recirculate it again.

Atmospheric has NO advantage. And once you crush it, the pitch (noise) gets higher under low boost blow-offs. Sounds ricey IMO.

- Brian

[96s14kat]

No, you just crush it. In a vise.

Get a vacum pump w/ gauge, and see where it opens now (BOV off the car, just connect the pump to the port ont he BOV and pump the air out...you'll see the valve start to lift off the seat). Probably between 15-17 inches.

Put it in a vise, and crush it (top to bottom) a little, then retest. Keep crushing until it takes ~20 inches to open it.

Only issue here is that while decel in gear, the vacuum is over 25 inches, and will cause the BOV to suck open still, and make lots of backfiring and popping until you push in the clutch.

It really is best to just recirculate it again.

Atmospheric has NO advantage. And once you crush it, the pitch (noise) gets higher under low boost blow-offs. Sounds ricey IMO.

- Brian

wow, thanks, i didnt think you literally crush the thing in a vise. but i guess its worth a try. thanks.

[Maeda]

Did you fix it or not?

[96s14kat]

Did you fix it or not?

yep, i got it all straightened out. it turned out to be the bov. im using a 1st gen eclipse bov and vacume at idle was opening it and since its not recirculated, it was causing it to get too much air. it was opening at about -15vac. so i crushed it so it doesnt open till about -25. i also got my dec air settings right and its running good, i just have to get it tuned on saturday.

[skatanic28]

thanks for all the info, i had no idea it leaks at our normal idle. im gonna run it recirc'd at first so it really shouldnt matter for me right?

[96s14kat]

thanks for all the info, i had no idea it leaks at our normal idle. im gonna run it recirc'd at first so it really shouldnt matter for me right?

yea that will work fine if you just recirculate it. that is how i have had mine for almost a year and it worked ok.

[BillKlineVT]

It appears to be too late to tell you since everyone already did, but I had this same issue with my KA-T setup. I thought I'd be cool and vent my 1st gen bov, but they are really ment to be recirc'd. I ended up recirculating and it runs like stock now.

[96s14kat]

It appears to be too late to tell you since everyone already did, but I had this same issue with my KA-T setup. I thought I'd be cool and vent my 1st gen bov, but they are really ment to be recirc'd. I ended up recirculating and it runs like stock now.

well i was driving it tonight and im almost positive im getting some compressor surge. i guess the bov is not opening all the time when it should. so i may just go ahead and recirculate it. i dont know what else to do because either the bov is too loose and it wont idle or i get compressor surge.