Bucking at 3-4k help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

homestar240 · 09-01-2011, 09:57 PM

95' 240

My KA starts bucking violently when i hit around 3k. the tach needle goes crazy between like 3-3.5k when it starts doing it, and the whole car starts bucking back and forth. changed plugs, wires, cap, rotor, fuel filter. also has a new distributor, correctly timed.

Jay420sx · 09-01-2011, 10:43 PM

Fuel pump...?

homestar240 · 09-01-2011, 11:06 PM

i was thinking fuel too....i wasn't sure if it was the pump or maybe a leaking injector? i can here the fuel pump prime and cut off...

Jay420sx · 09-01-2011, 11:09 PM

Yea but its prob weak as hell. If you have a friend with a 240 use their fp to see if it gets better.

homestar240 · 09-01-2011, 11:16 PM

thanks for the help

i'm probably going to try and change it anyways i'm sure it could use it.

Kaifd3s · 02-09-2012, 05:35 PM

any update?

SMM · 02-09-2012, 06:33 PM

Mine did the same.

Fuel pump. Change the sock also can be clogged.

Check MAF connection. Car will also do this if the MAF is unplugged car goes into limp mode.

nautical miles · 02-11-2012, 02:24 AM

had a similar issue, did all of the steps you will find if you search for this issue (which is fairly common). brand new fpr, new injectors, new iacv, new fuel filter, changed plugs, wires, cleaned the maf, checked codes over and over. never had one. eventually went to an autoparts store that i frequent all the time and told the guy that i was going to buy a new maf but if it didn't fix my problem, could i bring it back? he said that it would have to be a "wrong part" in order to do that. so i paid the 280.00 some odd dollars walked out to the parking lot, swapped mafs and it fixed every issue i was having. then returned the core. so if you have a good friend at a parts store maybe he will let you try it without buying it. other wise if it doesn't fix it, return it for a "wrong part".

TheSquidd · 02-11-2012, 02:39 AM

Had something similar going on with my SR.
Cleaned the MAF. Runs tits now.

s13 @ fullboost · 02-11-2012, 02:55 AM

Make Sure maf is clean use maf cleaner to clean it. Check wires for breaks make sure not are touching and put a little dielectric grease on the pins should solve your issues unless maf itself is busted inside

silvia_s14 · 02-11-2012, 07:06 AM

Had same problem. Changed injectors, fuel pump, fuel filter then swapped mafs with my bro and car ran perfect again. I got a used one on here from another zilvian. Car is still running good

09-01-2011, 09:57 PM	#1
homestar240 Join Date: Jun 2011 Location: United States Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Bucking at 3-4k help 95' 240 My KA starts bucking violently when i hit around 3k. the tach needle goes crazy between like 3-3.5k when it starts doing it, and the whole car starts bucking back and forth. changed plugs, wires, cap, rotor, fuel filter. also has a new distributor, correctly timed.

02-09-2012, 05:35 PM	#6
Kaifd3s Zilvia Addict Join Date: Feb 2008 Location: Tamarac, Florida Age: 39 Posts: 694 Trader Rating: (16) Feedback Score: 16 reviews	any update? __________________

02-11-2012, 02:39 AM	#9
TheSquidd Post Whore! Join Date: Nov 2004 Location: Where dirt goes to die. Posts: 3,165 Trader Rating: (7) Rides Gallery: TheSquidd Feedback Score: 7 reviews	Had something similar going on with my SR. Cleaned the MAF. Runs tits now. __________________ www.squidd.org www.violent-running.org

02-11-2012, 02:55 AM	#10
s13 @ fullboost Post Whore! Join Date: Dec 2007 Location: St.Petersburg,FL Posts: 2,550 Trader Rating: (15) Feedback Score: 15 reviews	Make Sure maf is clean use maf cleaner to clean it. Check wires for breaks make sure not are touching and put a little dielectric grease on the pins should solve your issues unless maf itself is busted inside __________________

09-01-2011, 10:43 PM	#2
Jay420sx Leaky Injector Join Date: Mar 2011 Location: South Florida Age: 35 Posts: 115 Trader Rating: (2) Feedback Score: 2 reviews	Fuel pump...?

09-01-2011, 11:06 PM	#3
homestar240 Join Date: Jun 2011 Location: United States Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	i was thinking fuel too....i wasn't sure if it was the pump or maybe a leaking injector? i can here the fuel pump prime and cut off...

09-01-2011, 11:09 PM	#4
Jay420sx Leaky Injector Join Date: Mar 2011 Location: South Florida Age: 35 Posts: 115 Trader Rating: (2) Feedback Score: 2 reviews	Yea but its prob weak as hell. If you have a friend with a 240 use their fp to see if it gets better.

09-01-2011, 11:16 PM	#5
homestar240 Join Date: Jun 2011 Location: United States Age: 34 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	thanks for the help i'm probably going to try and change it anyways i'm sure it could use it.

02-09-2012, 06:33 PM	#7
SMM Zilvia Addict Join Date: Sep 2009 Location: tampa Age: 37 Posts: 819 Trader Rating: (26) Feedback Score: 26 reviews	Mine did the same. Fuel pump. Change the sock also can be clogged. Check MAF connection. Car will also do this if the MAF is unplugged car goes into limp mode.

02-11-2012, 07:06 AM	#11
silvia_s14 Zilvia Member Join Date: Mar 2006 Location: fresno,ca Posts: 259 Trader Rating: (3) Feedback Score: 3 reviews	Had same problem. Changed injectors, fuel pump, fuel filter then swapped mafs with my bro and car ran perfect again. I got a used one on here from another zilvian. Car is still running good