Need help in Austin, TX! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mashloh · 08-02-2007, 11:06 PM

So I installed the standard 550cc injectors + T28 turbo + Z32 MAF + rom tune (rom tune from Jason of Emance)

Car starts ok, idles good at 800rpm but when i try to rev it past 2500rpm it bogs and dies..... I'm thinking it's the Z32 MAF or at least that is the first thing i wanna check out but i don't have a spare one to do so.

Anyone around Austin that has a working Z32 MAF that i can swap in to check if it is the MAF?

I'll buy this person lunch

mashloh · 08-03-2007, 02:22 AM

I tried unplugging the mafs and it did the same thing.. idled ok but once i started revving past 2500 rpm it woudl bog and die.

so i replugged in the mafs and started to played around with the SAFC settings... zeroed out everything and had the sensor at 1in 1out at first... same symptoms as above... then after fiddling around tryng 2in 6out as suggested by some of the searches i found, i finally got 3in 6out to work.
Can drive the car, only tried to boosted up till 0.5bar and didn't go past 5k rpm. Car didn't bog while accelerating... still had a problem when i slowed down to a stop the car would stall most of the time....

So now i'm not so sure its the mafs anymore...
I'm stumped at what to try next... suggestions anyone?

mashloh · 08-03-2007, 02:36 AM

ok read the ecu code and it gave me
12 = Air Flow Meter

so back to anyone in Austin with an n62 MAFS i can try out?
Though it still kinda bugs me that i can get the car running with the SAFC...

mashloh · 08-03-2007, 03:34 AM

Was double checking my wiring... is #3 necessary? I don't have it connected....

2 – White

3 – Ground (To chassis)

4 – Black

5 – Black/White

***S14DB*** · 08-03-2007, 04:02 AM

Got that SAFC installed correctly?

mashloh · 08-03-2007, 08:36 AM

Yah SAFC was working with old stock setup.

OBEEWON · 08-03-2007, 08:49 AM

Double check your wiring on the mafs. Ground to chassis is needed.

mashloh · 08-03-2007, 08:56 PM

ok so i double checked the wiring, grounded pin #3 onto the chasis and it's basically doing the same thing....

The fact that the car idles decently stable when i unplug the mafs tells me that the rom tune is working since i've installed 550cc injectors (and zeroed out all the SAFC settings) so if the rom tune wasn't working i'd be running too rich and wouldn't be able to idle right?

So my guess is that the mafs' voltage levels are jacked up so that's why if i mess with the in out settings of the SAFC i can get the car to run ok but not reliably? (car mainly stalls on decel)

mashloh · 08-04-2007, 12:13 PM

got another N62 mafs from the junk yard (pulled from a running J30).... still same thing....

If i have the SAFC set to 0in 0out and plug in the mafs, the afl reading shows 8% when the car is not running.... and when i keep this setting and start the car, the car won't idle... so this is saying the rom tune isn't adjusting the voltages for the mafs properly? Theoritcally if my rom tune was working properply i should be able to run with the SAFC zeroed out right?

AznDrftr. · 08-04-2007, 01:26 PM

where at in Austin you stay? I stay in Cove about 45 min away.

slamdbusa · 08-05-2007, 05:07 PM

Okay, I had this same consern when I went to a Z32.

Now, if the ECU is programmed for a Z32 MAF sensor, then you do not need to use the SAFC.

If the ECU is for a stock MAF sensor, then the SAFC needs to be programed for sensor in/out.

Z32 is 2
KA is 6
SR is listed in the owners manual.

On the set-up screen of the SAFC for in/out is:
IN is 2 (Z32)
OUT is 6 (KA*)
* I listed KA because I do not know what engine your are working with.

Now, here is the kicker. Disconnect the battery for the night* (major reset needed to run the SAFC in new configuration)
*You could wait several hours instead.

If all goes right than that sould do it. It should work now.

mashloh · 08-05-2007, 11:41 PM

ImportSeoul: You're in Cove, TX? isn't that near Houston? I live in north Austin

slamdbusa: My car is anSR and the rom tune is supposedly tuned for a Z32. Jason from Emance is gonna send me another pair of rom chips to try out. Hopefully that will fix it..

if not then I'll have to test out the ECU somehow and make sure I didn't mess it up when i was soldering stuff.

08-02-2007, 11:06 PM	#1
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	Need help in Austin, TX! So I installed the standard 550cc injectors + T28 turbo + Z32 MAF + rom tune (rom tune from Jason of Emance) Car starts ok, idles good at 800rpm but when i try to rev it past 2500rpm it bogs and dies..... I'm thinking it's the Z32 MAF or at least that is the first thing i wanna check out but i don't have a spare one to do so. Anyone around Austin that has a working Z32 MAF that i can swap in to check if it is the MAF? I'll buy this person lunch

08-03-2007, 04:02 AM	#5
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Got that SAFC installed correctly? __________________ Comments should be taken as Opinions not as Statements of Fact

08-03-2007, 08:49 AM	#7
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,053 Trader Rating: (9) Feedback Score: 9 reviews	Double check your wiring on the mafs. Ground to chassis is needed. __________________

08-05-2007, 05:07 PM	#11
slamdbusa Join Date: Jun 2007 Location: Texas Age: 55 Posts: 24 Trader Rating: (0) Feedback Score: 0 reviews	Okay, I had this same consern when I went to a Z32. Now, if the ECU is programmed for a Z32 MAF sensor, then you do not need to use the SAFC. If the ECU is for a stock MAF sensor, then the SAFC needs to be programed for sensor in/out. Z32 is 2 KA is 6 SR is listed in the owners manual. On the set-up screen of the SAFC for in/out is: IN is 2 (Z32) OUT is 6 (KA) I listed KA because I do not know what engine your are working with. Now, here is the kicker. Disconnect the battery for the night* (major reset needed to run the SAFC in new configuration) *You could wait several hours instead. If all goes right than that sould do it. It should work now. __________________ http://www.cardomain.com/ride/2510742

08-03-2007, 02:22 AM	#2
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	I tried unplugging the mafs and it did the same thing.. idled ok but once i started revving past 2500 rpm it woudl bog and die. so i replugged in the mafs and started to played around with the SAFC settings... zeroed out everything and had the sensor at 1in 1out at first... same symptoms as above... then after fiddling around tryng 2in 6out as suggested by some of the searches i found, i finally got 3in 6out to work. Can drive the car, only tried to boosted up till 0.5bar and didn't go past 5k rpm. Car didn't bog while accelerating... still had a problem when i slowed down to a stop the car would stall most of the time.... So now i'm not so sure its the mafs anymore... I'm stumped at what to try next... suggestions anyone?

08-03-2007, 02:36 AM	#3
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	ok read the ecu code and it gave me 12 = Air Flow Meter so back to anyone in Austin with an n62 MAFS i can try out? Though it still kinda bugs me that i can get the car running with the SAFC...

08-03-2007, 03:34 AM	#4
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	Was double checking my wiring... is #3 necessary? I don't have it connected.... 2 – White 3 – Ground (To chassis) 4 – Black 5 – Black/White

08-03-2007, 08:36 AM	#6
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	Yah SAFC was working with old stock setup.

08-03-2007, 08:56 PM	#8
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	ok so i double checked the wiring, grounded pin #3 onto the chasis and it's basically doing the same thing.... The fact that the car idles decently stable when i unplug the mafs tells me that the rom tune is working since i've installed 550cc injectors (and zeroed out all the SAFC settings) so if the rom tune wasn't working i'd be running too rich and wouldn't be able to idle right? So my guess is that the mafs' voltage levels are jacked up so that's why if i mess with the in out settings of the SAFC i can get the car to run ok but not reliably? (car mainly stalls on decel)

08-04-2007, 12:13 PM	#9
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	got another N62 mafs from the junk yard (pulled from a running J30).... still same thing.... If i have the SAFC set to 0in 0out and plug in the mafs, the afl reading shows 8% when the car is not running.... and when i keep this setting and start the car, the car won't idle... so this is saying the rom tune isn't adjusting the voltages for the mafs properly? Theoritcally if my rom tune was working properply i should be able to run with the SAFC zeroed out right?

08-04-2007, 01:26 PM	#10
AznDrftr. BANNED Join Date: Apr 2006 Location: 254 \| Texas. Age: 38 Posts: 2,293 Trader Rating: (3) Rides Gallery: AznDrftr. Feedback Score: 3 reviews	where at in Austin you stay? I stay in Cove about 45 min away.

08-05-2007, 11:41 PM	#12
mashloh Leaky Injector Join Date: Jun 2005 Location: Austin, TX Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	ImportSeoul: You're in Cove, TX? isn't that near Houston? I live in north Austin slamdbusa: My car is anSR and the rom tune is supposedly tuned for a Z32. Jason from Emance is gonna send me another pair of rom chips to try out. Hopefully that will fix it.. if not then I'll have to test out the ECU somehow and make sure I didn't mess it up when i was soldering stuff.