How to: s14 ka mafs repair - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SR240DET · 04-10-2007, 02:25 AM

So I have been having a weird problem fixing my stalling/bogging/hesitating problem for about a month. Nothing worked after I repaired and fixed everything that could possibly cause this problem. I wasnt throwing any codes so it made me think it was mechanical but i was wrong. this also fixed my buddys 240 that was throwing a mafs code.

If you are having a problem with stalling/bogging/hesitating, and it isn’t going away, start your car, and wiggle your mafs connector left and right kinda hard (but don’t break it!). If it stalls out check to see if their isnt any loose wires or it isnt dirty. If everything checks out good then you have a pretty common problem I have encountered for the past few years. take out your mafs and take off the 4 small Philips screws where the harness connector goes, and you will see your problem is inside. Sometimes the solder breaks loose and you get a bad connection. Here is how to fix it.

You will need:
1.small pliers
2.soldering iron
3.the really slim solder
4.heat shrink
5.something to cut with
6.heat gun
7. 20-22 gauge wire

First you want to remove the 4 small Philip screw on your mafs connector and remove that part from the mafs. Now you will take you connecter and pliers and bend the prongs down the opposite direction.(make sure you do all 3)

Take your mafs and hold it how I am in the picture, you will see 3 prongs sticking out and bend them down twards the writing that says flow. You don’t want the prongs to be down completely, just enough to stick your wire in there so you can get a good angle to solder.

Now take your 20-22 gauge wire and cut 3 1-2 inch strips. Strip both ends and apply a little solder to each end. I found it to be easier to solder the mafs first then the connecter part second. Now all you have to so is solder the wire to each of the correct ends. Make sure you use heat shrink as close as possible to each base of the mafs and connector.

Before you put it all back together make sure everything is good and tight. Shoving the wires inside the mafs is tricky, and try not to use any tools to shove the wires inside.

bolt your mafs back up and test it out

Well thats it i hope this will help some of you guys out. I honestly dont know if this will effect the mafs reading, but i havent had any problems for sometime now. If you are having similar problems try it out and make sure everything checks out good on your mafs reading with your DMM or consult. Good luck

chmercer · 04-10-2007, 02:34 AM

wierd. i have never heard of this being a problem area

SR240DET · 04-10-2007, 02:39 AM

yeah me neither, my friend and i are just unlucky I guess, so I assume this was common. I have 5 s14 mafs that went bad on me and this is how i recently learn how to fix it.

pbcstylez · 04-11-2007, 12:29 PM

this is odd, but i do see effects of crap messing up the connections, I just dont see how there's an opening that can get to those connections that you soldered?

also, any type of specific solder or flux?

SR240DET · 04-11-2007, 04:59 PM

When you open up your mafs from the only place possible, you look at the top most part their should be 3 resister looking parts with little prongs sticking out. You need to bend that part down. It should be really easy to bend, because they have the consistency of solder. I will try to get some better pictures.

As for solder just get the really slim stuff, like if you where soldering a printed circuit board

krappy · 04-11-2007, 05:09 PM

i had the same problem, bent the prongs so they could get a better connection and cleaned the prongs off....

SR240DET · 04-11-2007, 05:20 PM

Quote:

Originally Posted by krappy

i had the same problem, bent the prongs so they could get a better connection and cleaned the prongs off....

yep thats what happened to me. I just solder wires on so it wont ever happen again.

Quote:

i wonder if PCB cleaner in a can will work?

im sure it will, just do what krappy said if you dont want to solder anything.

pbcstylez · 04-11-2007, 05:12 PM

i wonder if PCB cleaner in a can will work?

krappy · 04-11-2007, 05:24 PM

LOL i used brake cleaner.... i shouldnt have but i did... it worked fine... just use a metal brush and brush off any build up on the prongs...

pbcstylez · 04-11-2007, 05:27 PM

nice thanks for the input!

swift_style · 04-11-2007, 11:02 PM

hey thanks for the write up sr24. I've been having the same problem and couldn't find out what was causing it. Plus I've been through two maf already. I'll check this out tomorrow. Thanks!!!

SR240DET · 04-11-2007, 11:05 PM

good luck swift, just ask if you have any questions, and let me know if it works.

04-10-2007, 02:25 AM	#1
SR240DET Zilvia FREAK! Join Date: Mar 2002 Location: orida Posts: 1,490 Trader Rating: (0) Feedback Score: 0 reviews	How to: s14 ka mafs repair So I have been having a weird problem fixing my stalling/bogging/hesitating problem for about a month. Nothing worked after I repaired and fixed everything that could possibly cause this problem. I wasnt throwing any codes so it made me think it was mechanical but i was wrong. this also fixed my buddys 240 that was throwing a mafs code. If you are having a problem with stalling/bogging/hesitating, and it isn’t going away, start your car, and wiggle your mafs connector left and right kinda hard (but don’t break it!). If it stalls out check to see if their isnt any loose wires or it isnt dirty. If everything checks out good then you have a pretty common problem I have encountered for the past few years. take out your mafs and take off the 4 small Philips screws where the harness connector goes, and you will see your problem is inside. Sometimes the solder breaks loose and you get a bad connection. Here is how to fix it. You will need: 1.small pliers 2.soldering iron 3.the really slim solder 4.heat shrink 5.something to cut with 6.heat gun 7. 20-22 gauge wire First you want to remove the 4 small Philip screw on your mafs connector and remove that part from the mafs. Now you will take you connecter and pliers and bend the prongs down the opposite direction.(make sure you do all 3) Take your mafs and hold it how I am in the picture, you will see 3 prongs sticking out and bend them down twards the writing that says flow. You don’t want the prongs to be down completely, just enough to stick your wire in there so you can get a good angle to solder. Now take your 20-22 gauge wire and cut 3 1-2 inch strips. Strip both ends and apply a little solder to each end. I found it to be easier to solder the mafs first then the connecter part second. Now all you have to so is solder the wire to each of the correct ends. Make sure you use heat shrink as close as possible to each base of the mafs and connector. Before you put it all back together make sure everything is good and tight. Shoving the wires inside the mafs is tricky, and try not to use any tools to shove the wires inside. bolt your mafs back up and test it out Well thats it i hope this will help some of you guys out. I honestly dont know if this will effect the mafs reading, but i havent had any problems for sometime now. If you are having similar problems try it out and make sure everything checks out good on your mafs reading with your DMM or consult. Good luck

04-10-2007, 02:34 AM	#2
chmercer BANNED Join Date: Jun 2003 Location: texas! Age: 39 Posts: 3,288 Trader Rating: (0) Feedback Score: 0 reviews	wierd. i have never heard of this being a problem area

04-10-2007, 02:39 AM	#3
SR240DET Zilvia FREAK! Join Date: Mar 2002 Location: orida Posts: 1,490 Trader Rating: (0) Feedback Score: 0 reviews	yeah me neither, my friend and i are just unlucky I guess, so I assume this was common. I have 5 s14 mafs that went bad on me and this is how i recently learn how to fix it.

04-11-2007, 12:29 PM	#4
pbcstylez Nissanaholic! Join Date: May 2005 Location: East Bay Age: 40 Posts: 2,110 Trader Rating: (0) Feedback Score: 0 reviews	this is odd, but i do see effects of crap messing up the connections, I just dont see how there's an opening that can get to those connections that you soldered? also, any type of specific solder or flux?

04-11-2007, 04:59 PM	#5
SR240DET Zilvia FREAK! Join Date: Mar 2002 Location: orida Posts: 1,490 Trader Rating: (0) Feedback Score: 0 reviews	When you open up your mafs from the only place possible, you look at the top most part their should be 3 resister looking parts with little prongs sticking out. You need to bend that part down. It should be really easy to bend, because they have the consistency of solder. I will try to get some better pictures. As for solder just get the really slim stuff, like if you where soldering a printed circuit board

04-11-2007, 05:09 PM	#6
krappy Nissanaholic! Join Date: Jan 2006 Location: Norcross, GA Posts: 1,634 Trader Rating: (41) Feedback Score: 41 reviews	i had the same problem, bent the prongs so they could get a better connection and cleaned the prongs off....

04-11-2007, 05:12 PM	#8
pbcstylez Nissanaholic! Join Date: May 2005 Location: East Bay Age: 40 Posts: 2,110 Trader Rating: (0) Feedback Score: 0 reviews	i wonder if PCB cleaner in a can will work?

04-11-2007, 05:24 PM	#9
krappy Nissanaholic! Join Date: Jan 2006 Location: Norcross, GA Posts: 1,634 Trader Rating: (41) Feedback Score: 41 reviews	LOL i used brake cleaner.... i shouldnt have but i did... it worked fine... just use a metal brush and brush off any build up on the prongs...

04-11-2007, 05:27 PM	#10
pbcstylez Nissanaholic! Join Date: May 2005 Location: East Bay Age: 40 Posts: 2,110 Trader Rating: (0) Feedback Score: 0 reviews	nice thanks for the input!

04-11-2007, 11:02 PM	#11
swift_style Zilvia Junkie Join Date: Aug 2006 Location: CA Posts: 445 Trader Rating: (0) Feedback Score: 0 reviews	hey thanks for the write up sr24. I've been having the same problem and couldn't find out what was causing it. Plus I've been through two maf already. I'll check this out tomorrow. Thanks!!!

04-11-2007, 11:05 PM	#12
SR240DET Zilvia FREAK! Join Date: Mar 2002 Location: orida Posts: 1,490 Trader Rating: (0) Feedback Score: 0 reviews	good luck swift, just ask if you have any questions, and let me know if it works.