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

SE-R Spec · 07-19-2009, 09:30 AM

whats up guys.

alright so i just did the sr swap into my 92 S13. everything is wired corectly according to the diagrams

go to start the car and it starts but sputters and dies. after a while we narrowed it down to the MAF being the problem.

if you cover the MAF with your hand, restricting the amount of air going in, the car will run, rev, blow off, everything fine which baffles me.

i have tried to move the MAF farther away from the turbo inlet but nothing changed. i am currently using the stock rubber tube and the intake with the MAF at teh end near the front of the fender on the driver side.

can anybody suggest something other than getting a new MAF? i have 2 KA MAFs and 1 SR MAF that i have tried with all the same results. i am pretty sure that all 3 of those are not FUBAR'd

derek

Sileighty_85 · 07-19-2009, 10:46 AM

do you have an SAFC or ECU tuned for the Z32 MAF?

SE-R Spec · 07-19-2009, 11:23 AM

no i do not, it is a stock ECU and no piggybacks or other tunning software.

i only have teh 1 sr MAF and 2 KA mafs. all 3 of them came out with the same result

KiLLeR2001 · 07-19-2009, 02:29 PM

You need SOHC KA MAF, if you're using KA24DE MAF I don't think it will work right.

Sileighty_85 · 07-19-2009, 02:43 PM

you need an SAFC if you wanna use a differnt MAF

silviamayne · 07-19-2009, 03:00 PM

yea try a sohc maf, the dohc won't work. youll need the plug for the sohc maf tho its smaller than the sr an dohc one

SE-R Spec · 07-19-2009, 04:27 PM

yea i have the 3 pin one of the KA MAFs. i had to switch out the plugs for the 4 pin SR MAF.

i am stumpted......

SE-R Spec · 07-19-2009, 05:48 PM

bump......

silviamayne · 07-19-2009, 05:56 PM

check the white maf wire on the ecu.

tre4s13 · 07-19-2009, 05:59 PM

Quote:

Originally Posted by Sileighty_85

you need an SAFC if you wanna use a differnt MAF

+1 msglength

sliddinsil8o · 07-19-2009, 06:03 PM

if it did this with the sr maf...have you ck'd your timing?

SE-R Spec · 07-19-2009, 07:00 PM

Quote:

Originally Posted by silviamayne

check the white maf wire on the ecu.

alright, will check the status on that asap

Quote:

Originally Posted by tre4s13

+1 msglength

i am using stock MAFs

Quote:

Originally Posted by sliddinsil8o

if it did this with the sr maf...have you ck'd your timing?

timing should be fine. like i said it ran, revved, blew off, idled, everything perfect when you have your hand over the MAF restricting the air flow but as soon as you take your hand off, it sputters and dies.

SE-R Spec · 07-20-2009, 08:58 AM

bump still need assistance

SE-R Spec · 07-20-2009, 12:58 PM

Video showing what i was talking about

0wn3r · 07-20-2009, 02:50 PM

can't see video while i'm at work, but have you tried cleaning it w/ MAF cleaner?

SE-R Spec · 07-20-2009, 03:12 PM

Quote:

Originally Posted by 0wn3r

can't see video while i'm at work, but have you tried cleaning it w/ MAF cleaner?

yessir. can try again but looking for other fixes.

sliddinsil8o · 07-21-2009, 03:40 AM

doesnt sound "fine" when it is running, that just me though. i still say timing, you say it should be right, but have you actually used a timing gun to make sure. like you said you are looking for help, im just throwing out my 2 cents, take it or leave it.

SE-R Spec · 07-21-2009, 06:25 PM

i just drove the car with a buddy sitting on the engine to my culdisac and back (not very far at all so dont flame) and it ran fine. also have a vid that i can post up later.

it is the MAF FOR SURE. the wiring is supposed to be correct since a running sr was in this car before and it is the same exact harness. i personally saw this car run with the other sr.

anybody know what the hell is going on?

slownslurious · 07-21-2009, 09:13 PM

If I were you I would double check for vaccuum leaks, block off the BOV for now, and double check your timing before you proceed any further. Any of these problems could make the MAf look like the problem and could even be helped by "putting yout hand in front of it"

Sileighty_85 · 07-21-2009, 09:25 PM

there are 2 big holes on the rubber intake pipe for the BOV and valve cover did you plug those

SE-R Spec · 07-22-2009, 07:10 PM

Quote:

Originally Posted by Sileighty_85

there are 2 big holes on the rubber intake pipe for the BOV and valve cover did you plug those

yes i have replaced the stock intake tube with just a solid rubber tube with no lines coming from it.

if the timing wasnt right, the car would not have ran the length of a football field twice, only running pig rich.

if there was a vacuum leak, the BOV would not be activating while driving and it would not idle smooth.

i am 99% positive that the MAF is the culprit, i just have to find another one now. i had almost the same problem in my spec v.

07-19-2009, 09:30 AM	#1
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	MAF problem (stumpted) NOW WITH VIDEO whats up guys. alright so i just did the sr swap into my 92 S13. everything is wired corectly according to the diagrams go to start the car and it starts but sputters and dies. after a while we narrowed it down to the MAF being the problem. if you cover the MAF with your hand, restricting the amount of air going in, the car will run, rev, blow off, everything fine which baffles me. i have tried to move the MAF farther away from the turbo inlet but nothing changed. i am currently using the stock rubber tube and the intake with the MAF at teh end near the front of the fender on the driver side. can anybody suggest something other than getting a new MAF? i have 2 KA MAFs and 1 SR MAF that i have tried with all the same results. i am pretty sure that all 3 of those are not FUBAR'd derek Last edited by SE-R Spec; 07-20-2009 at 12:57 PM..

07-19-2009, 10:46 AM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	do you have an SAFC or ECU tuned for the Z32 MAF? __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

07-19-2009, 02:29 PM	#4
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	You need SOHC KA MAF, if you're using KA24DE MAF I don't think it will work right. __________________

07-19-2009, 02:43 PM	#5
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	you need an SAFC if you wanna use a differnt MAF __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

07-19-2009, 06:03 PM	#11
sliddinsil8o Leaky Injector Join Date: May 2005 Location: T3x@$$ Age: 40 Posts: 107 Trader Rating: (1) Feedback Score: 1 reviews	if it did this with the sr maf...have you ck'd your timing? __________________ **SIGNATURE EXCEEDS FORUM LIMITS....PLEASE READ THE RULES**

07-19-2009, 11:23 AM	#3
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	no i do not, it is a stock ECU and no piggybacks or other tunning software. i only have teh 1 sr MAF and 2 KA mafs. all 3 of them came out with the same result

07-19-2009, 03:00 PM	#6
silviamayne Leaky Injector Join Date: Mar 2006 Location: Staunton Va Posts: 118 Trader Rating: (2) Feedback Score: 2 reviews	yea try a sohc maf, the dohc won't work. youll need the plug for the sohc maf tho its smaller than the sr an dohc one

07-19-2009, 04:27 PM	#7
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	yea i have the 3 pin one of the KA MAFs. i had to switch out the plugs for the 4 pin SR MAF. i am stumpted......

07-19-2009, 05:48 PM	#8
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	bump......

07-19-2009, 05:56 PM	#9
silviamayne Leaky Injector Join Date: Mar 2006 Location: Staunton Va Posts: 118 Trader Rating: (2) Feedback Score: 2 reviews	check the white maf wire on the ecu.

07-20-2009, 08:58 AM	#13
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	bump still need assistance

07-20-2009, 12:58 PM	#14
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Video showing what i was talking about

07-20-2009, 02:50 PM	#15
0wn3r Zilvia Addict Join Date: Oct 2007 Location: CT Posts: 676 Trader Rating: (4) Feedback Score: 4 reviews	can't see video while i'm at work, but have you tried cleaning it w/ MAF cleaner? __________________ 97 240sx se

07-21-2009, 03:40 AM	#17
sliddinsil8o Leaky Injector Join Date: May 2005 Location: T3x@$$ Age: 40 Posts: 107 Trader Rating: (1) Feedback Score: 1 reviews	doesnt sound "fine" when it is running, that just me though. i still say timing, you say it should be right, but have you actually used a timing gun to make sure. like you said you are looking for help, im just throwing out my 2 cents, take it or leave it. __________________ **SIGNATURE EXCEEDS FORUM LIMITS....PLEASE READ THE RULES**

07-21-2009, 06:25 PM	#18
SE-R Spec Join Date: Jul 2009 Location: West Virginia Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	i just drove the car with a buddy sitting on the engine to my culdisac and back (not very far at all so dont flame) and it ran fine. also have a vid that i can post up later. it is the MAF FOR SURE. the wiring is supposed to be correct since a running sr was in this car before and it is the same exact harness. i personally saw this car run with the other sr. anybody know what the hell is going on?

07-21-2009, 09:13 PM	#19
slownslurious Zilvia Junkie Join Date: Jun 2005 Location: somewhereville Posts: 406 Trader Rating: (0) Feedback Score: 0 reviews	If I were you I would double check for vaccuum leaks, block off the BOV for now, and double check your timing before you proceed any further. Any of these problems could make the MAf look like the problem and could even be helped by "putting yout hand in front of it"

07-21-2009, 09:25 PM	#20
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	there are 2 big holes on the rubber intake pipe for the BOV and valve cover did you plug those __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

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