bad maf?

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

so i finally got my 240 running but now it is running like s***. it wont rev past 3k. and it idles real rough. could it be the maf? i posted on a different 240 forum and they said it was the MAF but i just wanna check again with you guys. anyone know what it could be or if it really is the MAF? thanks dudes.


User avatar
mRodiek
Posts: 2153
Joined: Fri Mar 07, 2008 9:42 am
Car: Stock Hatch
Location: CHICangeles
Contact:

Post

Probably yes, clean it & try again.

User avatar
xX RB Xx
Posts: 3719
Joined: Wed Jun 20, 2007 3:15 pm
Car: SE3P, FC3S, FC3C.
Location: Japan

Post

It could possibly be the maf, but I had mine stolen off my car and It wouldn't let me rev Past 2.5k.

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

so i put the new maf in and it still does it. im not sure if it is wired in right tho because there isnt a plug it is just individual wires with connectors on the ends then they go on each prong on the maf. i connected them how it was when i took the old one off but maybe the previous owner messed up the order of the wires? im not sure. so im going to check each wire and see if they are all right.

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

if the wires are all right and this new maf didnt help. anyone else know what it could be if it isnt the maf?

gnvarnadore
Posts: 1092
Joined: Fri Jan 05, 2007 8:54 am
Car: 89 240sx Base Coupe(daily/project) 91 240sx SE Coupe(sold) 92 240sx SE Coupe(sold) 89 240sx Base Hatch(sold) 93 240sx SE Hatch(SOLD!!!)
Contact:

Post

check your injectors, my car wasnt running right and all my friends were telling me it was my MAF or TPS but turns out i had bad injectors.

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

gnvarnadore wrote:check your injectors, my car wasnt running right and all my friends were telling me it was my MAF or TPS but turns out i had bad injectors.
alright i will check them.

User avatar
HoosierSX
Posts: 399
Joined: Wed Mar 12, 2008 5:07 am
Car: 1992 Nissan 240sx, 1971 Chevrolet Camaro

Post

what engine? are you running an afc?

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

HoosierSX wrote:what engine? are you running an afc?
ka24de. nope no afc. its all stock. i got the car like this. i was told it was rebuilt with only 3k miles on the motor.

User avatar
xX RB Xx
Posts: 3719
Joined: Wed Jun 20, 2007 3:15 pm
Car: SE3P, FC3S, FC3C.
Location: Japan

Post

have you checked your ECU Fault Codes?

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

xX RB Xx wrote:have you checked your ECU Fault Codes?
how do i do that? is that different then checking a check engine light? cause the check engine light isnt on.

User avatar
Angerman
Posts: 69
Joined: Fri Sep 11, 2009 5:08 pm
Car: 89 240sx

Post

im 99% sure it's sure maf same thing happened to me except i had to get a new one :D

User avatar
HoosierSX
Posts: 399
Joined: Wed Mar 12, 2008 5:07 am
Car: 1992 Nissan 240sx, 1971 Chevrolet Camaro

Post

yea...definitely sounds like a maf problem. when i did my sr swap, it did the exact same thing. i ended up having the afc wiring wrong. check you maf ground make sure its getting connection all the way to your maf plug. check all the other wires, i dont remember what wire was what on the ka, but you can just make sure the wires arent broken. check continuity for all wires. go from the maf plug all the way to your ecu and even wiggle the wires while you do so just to make sure theres not a bad connection somewhere. im too lazy to look up what color is what and which maf wires going into the ecu. maybe someone can dig up a diagram to show all that stuff.

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

HoosierSX wrote:yea...definitely sounds like a maf problem. when i did my sr swap, it did the exact same thing. i ended up having the afc wiring wrong. check you maf ground make sure its getting connection all the way to your maf plug. check all the other wires, i dont remember what wire was what on the ka, but you can just make sure the wires arent broken. check continuity for all wires. go from the maf plug all the way to your ecu and even wiggle the wires while you do so just to make sure theres not a bad connection somewhere. im too lazy to look up what color is what and which maf wires going into the ecu. maybe someone can dig up a diagram to show all that stuff.
alright thanks. i am about to go and check all my wires right now. they look all jacked up and wrapped in electrical tape so something must be wrong.

newdude1
Posts: 637
Joined: Fri May 09, 2008 6:31 am

Post

A little off topic but what would cause the car to run like crap below 3k but run smooth if you are WOT? I have no partial throttle either. Could that be caused by a maf too?

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

ok so i checked all the wires and they all are where they are supposed to be and look fine. the car idles better now but still wont go past 3k. when im just sitting and not moving and i press the gas it just sounds like the car has launch control. and when im driving it will just jerk once it gets to 2.5k-3k. and it is also burning oil so like WTH is going on

User avatar
HoosierSX
Posts: 399
Joined: Wed Mar 12, 2008 5:07 am
Car: 1992 Nissan 240sx, 1971 Chevrolet Camaro

Post

u sure its burning oil and not running extremely rich?

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

HoosierSX wrote:u sure its burning oil and not running extremely rich?
maybe could be just real rich.i just know it is blowing smoke.

User avatar
zerepdivad
Posts: 2010
Joined: Thu Nov 24, 2005 5:39 pm
Car: '90 240sx . '02 Lexus IS300
Location: WI

Post

sell me the car for 200 bucks then i'll fix it and sell it back to you?

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

zerepdivad wrote:sell me the car for 200 bucks then i'll fix it and sell it back to you?
haha. sell you the car for 200 then you fix it and GIVE it back to me.

User avatar
zerepdivad
Posts: 2010
Joined: Thu Nov 24, 2005 5:39 pm
Car: '90 240sx . '02 Lexus IS300
Location: WI

Post

I'm sure i can fix that for you if you really wanted. I got spare harness,ecu mafs, etc just in case. along with a spare ka24de parts motor. Email me if [email protected] located in elkhorn, wi.

boostedka_s13
Posts: 21
Joined: Tue Jul 28, 2009 4:27 am

Post

zerepdivad wrote:I'm sure i can fix that for you if you really wanted. I got spare harness,ecu mafs, etc just in case. along with a spare ka24de parts motor. Email me if [email protected] located in elkhorn, wi.
alright that would be cool. i have the car up for sale. if no one buys it soon then i will prolly just fix it. i will let you know.


Return to “240sx General Discussion”