z32 maf problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nicku · 02-29-2008, 05:08 PM

Hey guys...
my setup is redtop, s15 turbo, nismo 555 injectors, walbro fuel pump, safc2, and plx wideband, and now z32 maf and my car is at stock boost.
I just installed my z32 maf today. and the car started acting very weird.
First of all, the car became lean. My idle was 14.6-15.2 before. And now it became 16-17. So I used safc to turn up the fuel a little bit. And it ran right for like 10 minutes. and then after that, it became really rich.
so I turned down the fuel again. And it became lean. Its just keep doing this back and forth. Until now, I dont know what's going on. When I turn up the fuel, the wideband shows the car getting leanner and leanner and died.
My question is if at stock boost, the z32 maf will make the car lean that much?

I tried to unplugged the maf, and the car went dead. So that means the maf IS working right?

what could be the problems???

*ManoNegra* · 02-29-2008, 05:43 PM

I've never messed with an safc but don't you need to tell it what maf you're using? Did you do that prior to the problem?

*1QUICK4* · 02-29-2008, 05:59 PM

Is your afc set to 2 in and 6 out? If you are using an ecu that is tuned for Z32 maf than it's 2 in 2 out

nicku · 02-29-2008, 08:02 PM

yes i already did. 2 in 6 out.
and the car is getting no power. Basically its n62 maf and im not sure its maxima plug or n62 plug. its got 5 wires on the plug.
and the car is lean while idle. and when its lean, the vac from 20 becomes 15. when its normal the vac stays at 20. but most of the time when the car is idling, it is lean....like 16-17 sometimes it goes up to 18

nicku · 02-29-2008, 10:25 PM

nobody has any clue???

*downshift_sideways* · 03-01-2008, 12:16 AM

Try checking all your wiring to your mafs sensor.

Also check your z32 Ground that runs to the chasis/body.

Your safc2 settings are correct.

When you installed your SAFC2 can you explain to me, how you wired up the MAFS wiring to the ECU?

nicku · 03-01-2008, 02:39 AM

my friend installed it for me.....but we soldered the connection...it shouldnt be loose....and It was okay before I changed the z32 maf.....
by the way, how am i supposed to wire the maf to ecu??? Please let me know and i will check it tomorrow

nicku · 03-01-2008, 10:34 AM

checked the maf to ecu signal wire...and it was fine.
I found out something. When the car was cold or not completely warm. the car is acting normal. Once its getting warm, the car starts getting leaner and leaner

*downshift_sideways* · 03-01-2008, 12:19 PM

double check your wiring with this diagram.

http://www.zeroyon.com/index/content/view/33/47/

nicku · 03-01-2008, 12:45 PM

yeah...i just checked the safc connections...everything is fine. And we tested the voltage on the maf, and it was good. Somehow if we let the connector on the maf almost not connected, the wideband reading became normal.....so now i just changed back to the stock maf..... any other ideas?

02-29-2008, 05:08 PM	#1
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	z32 maf problem Hey guys... my setup is redtop, s15 turbo, nismo 555 injectors, walbro fuel pump, safc2, and plx wideband, and now z32 maf and my car is at stock boost. I just installed my z32 maf today. and the car started acting very weird. First of all, the car became lean. My idle was 14.6-15.2 before. And now it became 16-17. So I used safc to turn up the fuel a little bit. And it ran right for like 10 minutes. and then after that, it became really rich. so I turned down the fuel again. And it became lean. Its just keep doing this back and forth. Until now, I dont know what's going on. When I turn up the fuel, the wideband shows the car getting leanner and leanner and died. My question is if at stock boost, the z32 maf will make the car lean that much? I tried to unplugged the maf, and the car went dead. So that means the maf IS working right? what could be the problems???

03-01-2008, 12:16 AM	#6
downshift_sideways No Limit Soldier. Join Date: Jan 2006 Location: Hayward CA, San Gabriel CA Age: 38 Posts: 5,550 Trader Rating: (0) Rides Gallery: downshift_sideways Feedback Score: 0 reviews	Try checking all your wiring to your mafs sensor. Also check your z32 Ground that runs to the chasis/body. Your safc2 settings are correct. When you installed your SAFC2 can you explain to me, how you wired up the MAFS wiring to the ECU? __________________ allntrlundrgrnd: "you never really appreciate your parents fridge until you look into your own and its full of condiments only"

03-01-2008, 12:19 PM	#9
downshift_sideways No Limit Soldier. Join Date: Jan 2006 Location: Hayward CA, San Gabriel CA Age: 38 Posts: 5,550 Trader Rating: (0) Rides Gallery: downshift_sideways Feedback Score: 0 reviews	double check your wiring with this diagram. http://www.zeroyon.com/index/content/view/33/47/ __________________ allntrlundrgrnd: "you never really appreciate your parents fridge until you look into your own and its full of condiments only"

02-29-2008, 05:43 PM	#2
ManoNegra Guild of Skullduggerous Intent Join Date: Jan 2004 Location: Socal Posts: 7,841 Trader Rating: (48) Feedback Score: 48 reviews	I've never messed with an safc but don't you need to tell it what maf you're using? Did you do that prior to the problem?

02-29-2008, 05:59 PM	#3
1QUICK4 Stop or I'll Shoost Join Date: Aug 2007 Location: ND Age: 40 Posts: 648 Trader Rating: (0) Feedback Score: 0 reviews	Is your afc set to 2 in and 6 out? If you are using an ecu that is tuned for Z32 maf than it's 2 in 2 out

02-29-2008, 08:02 PM	#4
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	yes i already did. 2 in 6 out. and the car is getting no power. Basically its n62 maf and im not sure its maxima plug or n62 plug. its got 5 wires on the plug. and the car is lean while idle. and when its lean, the vac from 20 becomes 15. when its normal the vac stays at 20. but most of the time when the car is idling, it is lean....like 16-17 sometimes it goes up to 18

02-29-2008, 10:25 PM	#5
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	nobody has any clue???

03-01-2008, 02:39 AM	#7
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	my friend installed it for me.....but we soldered the connection...it shouldnt be loose....and It was okay before I changed the z32 maf..... by the way, how am i supposed to wire the maf to ecu??? Please let me know and i will check it tomorrow

03-01-2008, 10:34 AM	#8
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	checked the maf to ecu signal wire...and it was fine. I found out something. When the car was cold or not completely warm. the car is acting normal. Once its getting warm, the car starts getting leaner and leaner

03-01-2008, 12:45 PM	#10
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 40 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	yeah...i just checked the safc connections...everything is fine. And we tested the voltage on the maf, and it was good. Somehow if we let the connector on the maf almost not connected, the wideband reading became normal.....so now i just changed back to the stock maf..... any other ideas?