Need some help

[DammitBobby]

I installed the JWT ECU, Deatchwerks 740cc and Z32 MAF. Only problem I was having was the open BOV and the idle. To fix this problem I I purchase a SAFCII and Zeitronix wideband. I installed the SAFCII and wideband this past weekend with no problems. Everything was working fine I just made a few ajustments to the Dec setting and NE1. Drove around yesterday and stop to talk to my neighbor while the car was idling. The car stalled out and ran real bad like when I blew my BOV off. So I get it home and shut it off for the night. This morning I start it again same thing wont idle under 2k and running rough. This afternoon I check all the vacuum lines and the BOV. Also checked my wiring that I soldered for the SAFCII and Wideband So I start it up again same thing but after a few minutes it starts running normal again. Vacuum returns to normal everything seems fine. Then after a few more minutes it acts up again running rough. I don`t think it is a vacuum leak because it would do it all the time. Any guesses?

[S14tat]

when you use the dec air setting on the safc, the car will run really lean when its cold. usually people readjust the ne1 to make it idle smooth until the car warms up enough. once it warms up, they set the number back to what it was before and the car will drive fine.

what are your afr's when the car is idling like crap? and did you add fuel at idle to see if the idle improves?

[DammitBobby]

The vacuum went below 10 and it would idle bad then after a few minutes the vacuum would go back to 20 and it would run normal. The AFR were bouncing all over the place run as high as 19 and drop to 15 it didn`t matter it ran rough the whole time until the vacuum reached 20 then it would idle correctly.

[Structure240sx]

once it does reach 20 vacuum does it go back to idling rough while you are driving?

[DammitBobby]

I am not trying to drive it when it goes back to 20 I am sitting at idle trying to monitor the SAFCII. About the time it takes me to change over to settings to mess with the DEC settings it will stall out. Then it will repeat itself and run rough for a few minutes then it will move vacuum to 20 and start idling correctly.

[S14tat]

are the settings on hot wire and did you play with the in and out settings? the afr would bounce around reguardless if the car is idling funny. so i would just ignore the bouncing around for now and just try to add fuel until it stables out.

a lean idle would also bounce around and the afr would be going all over place along with vac. the vac is directly related to engine rpm from what i see. so if the cars idling like crap from running lean, the vac would bounce around too becasue of the unsteady rpm.

[DammitBobby]

Settings SAFCII

5in 5out

DEC2%4%5%

I also checked with Zeitronix about the O2 simulation for the ECU and they said that it works with my setup.

[S14tat]

why don't you just go to the low throttle setting and add fuel to the 1000-1500 rpm area? when a car would have a very lean afr, the afr would bounce around and have flucturating vac at idle.

every car has a different dec air settings. but generally the first number would be the throttle position used to get ne2's rpm.

ne1 would be the air flow percentage at that rpm. and ne2 would be the air flow percentage for that given rpm. its best to do it when its cold. when the dec air is screwed up, it wouldn't idle right at all. and it would occassionaly stall. if the settings are done right, it would only idle funny on a cold start up and it would drive fine when it warms up.

[DammitBobby]

Well no luck. Things I have check are the Wiring for the SAFCII and the Zeitronix. Everything checks back to the wiring harness. The problem: It will start fine somtimes and sometimes not. It will idle fine when its cold or hot. Sometimes it wont idle when its cold or hot. The SACII seems to be working as I can richen or lean the idle at low thr. The wideband seems to work fine. This is a intermitten problem. I don`t think it has anything right now to do with the SAFCII settings. My guess it is a component intermitten failure. Things I notice when it is not running good.

1 Air flow % doesnt change alot2 Vacuum drops to 10 3 It makes a weird pop noise. almost like a spark plug wire grounding out. I guess I can check that at night. I should see a blue spark somewhere at night. Yes the spark plug wires are old and cracking.4 I disconnected the temp sensor and it ran fine and ran rough

[SloS13]

LOL change your spark plug wires. The DEC-AIR settings are very sensitive.

[DammitBobby]

I decided to clean the MAF connector even though it did not look dirty with contact cleaner. I turned the car off and stuck my VM in the MAF to check the voltage going to the ECU. When I cranked the car up it was reading around 1v. It quit running rough and I waited for several minutes but it just held steady. So I took her out for a short spin and it was running fine other then I need to work on the DEC settings because It keeps stalling out. So I am hoping that was the problem dirty contact on the MAF connector.

[S14tat]

or maybe its your maf thats going out. i had to change my maf twice.