please help me. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Buntaseightsix · 02-25-2012, 11:30 AM

I have this problem with my 240 that it wants to stall each time i give it gas, have no idea what it could be. Ecu keeps throwing code 12 even though i have changed 2 working ones and 1 one brand new one. Also tried a different ecu light was off, but still same problem. Anyone who can help, please do.

Things I've done

clean iacv
cleaned throttle body
checked continuity on all three cables on the pigtail of maf and the red/black cable that leads to the relay, and made a new ground that lead to the chassis.
checked all vacuum lines, no leaks
timing on point at 18
fuel pressure is at 38 forgot what fsm says it is
new fuel filter
maf read .19 with ignition on, and 1.4 at idle

have been breaking my head for around a month now. video included. please help.

240sx stalling problem - YouTube

Schwiegz · 02-25-2012, 11:49 AM

have you considered going back to a stock maf and seeing what happens?

Buntaseightsix · 02-25-2012, 12:06 PM

Quote:

Originally Posted by Schwiegz

have you considered going back to a stock maf and seeing what happens?

i have and it holds an idle for about 2-3 seconds and it just stalls on its own

trevor34 · 02-25-2012, 01:15 PM

Just a stock maf? Even with continuity doesn't mean everything is ok. Could be a wire hanging on with one strand of wire. Try looking for splits or just make a jumper wire and see if it solves your issue.

Buntaseightsix · 02-25-2012, 01:28 PM

Quote:

Originally Posted by trevor34

Just a stock maf? Even with continuity doesn't mean everything is ok. Could be a wire hanging on with one strand of wire. Try looking for splits or just make a jumper wire and see if it solves your issue.

yeah its the stock g60 maf....im going to try that and see if that fixes the issue...will report back later today

Buntaseightsix · 02-25-2012, 03:06 PM

havent tried the jumper cable yet since i need a ride to go buy some wires......anyone else have any ideas as to what it might be?

trevor34 · 02-25-2012, 06:55 PM

It has to be the maf because your car should die when you disconnect the maf while its running, well it does on my s14 anyways. I'd try the jumper its quick and easy to do you don't need to even cut the wires just pull the wire cover back and jump it straight to the ecu.

Buntaseightsix · 02-28-2012, 05:48 PM

Quote:

Originally Posted by trevor34

Just a stock maf? Even with continuity doesn't mean everything is ok. Could be a wire hanging on with one strand of wire. Try looking for splits or just make a jumper wire and see if it solves your issue.

So I finally got around to doing the jumper wires to no evail. Anyone else have any suggestions, I found similar threads but they never post what it was that caused the issue. Please, anyone have any idea?

ma.jomaa · 02-28-2012, 05:59 PM

I had the same problem with mine and it turned out to be fouled spark plugs, Not sure if its going to be the same with you but it doesn't hurt to check them. GL

Buntaseightsix · 02-28-2012, 06:15 PM

Quote:

Originally Posted by ma.jomaa

I had the same problem with mine and it turned out to be fouled spark plugs, Not sure if its going to be the same with you but it doesn't hurt to check them. GL

Just checked the plugs and they look sooty, I'm going to replace them and see what happens. Did you cel turn on as well?

Buntaseightsix · 02-28-2012, 09:23 PM

Just changed the spark plugs and still nothin, anyone know if the car would run if the fuel pump had a bad ground?

Buntaseightsix · 03-01-2012, 04:37 PM

Bump....anyone who could help?

Vitzio240sx · 03-01-2012, 04:49 PM

check throttle position sensor, mines had the same problem... and new tps fixed it

Buntaseightsix · 03-03-2012, 01:56 PM

I had good reading on the old tps but changed it with a new one and still the same thing.....really frustrated at this point, anyone else?

Mishkin_707 · 03-03-2012, 02:10 PM

Have you cleaned your actual air filter? Checked you CTS? how's your battery/alternator? Any loose/dirty grounds? Fuel injectors leaking? Can you smell raw fuel in the cylinder after pulling spark plugs?

Buntaseightsix · 03-03-2012, 02:24 PM

Quote:

Originally Posted by Mishkin_707

Have you cleaned your actual air filter? Checked you CTS? how's your battery/alternator? Any loose/dirty grounds? Fuel injectors leaking? Can you smell raw fuel in the cylinder after pulling spark plugs?

I clean the filter on a consistent basis, replaced the coolant temp sensor a not that long ago when my car would start up right away, have checked and cleaned all grounds, changed all the injectors to some newer one I has Latin around, and for the raw fuel I do notice a a real strong rich smell out of exhaust, the timing is on point and have new spark plugs

Kingtal0n · 03-04-2012, 10:43 AM

How about wrong maf sensor for the ECU?

Has it ever run correctly with that combo?

If the engine has good compression, correct ignition timing, and correct fuel quantity per cylinder event, then it will run right.

You hit the gas, what happens with the maf? The maf voltage spikes, the ECU responds by increasing fueling based on a non-linear map that is charted based on MAF voltage. If the maf sends the wrong voltage (incorrect maf, bad maf, airflow breach, bad wiring) then fueling will be wrong also.

02-25-2012, 11:30 AM	#1
Buntaseightsix Join Date: Feb 2012 Location: 661 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	please help me. I have this problem with my 240 that it wants to stall each time i give it gas, have no idea what it could be. Ecu keeps throwing code 12 even though i have changed 2 working ones and 1 one brand new one. Also tried a different ecu light was off, but still same problem. Anyone who can help, please do. Things I've done clean iacv cleaned throttle body checked continuity on all three cables on the pigtail of maf and the red/black cable that leads to the relay, and made a new ground that lead to the chassis. checked all vacuum lines, no leaks timing on point at 18 fuel pressure is at 38 forgot what fsm says it is new fuel filter maf read .19 with ignition on, and 1.4 at idle have been breaking my head for around a month now. video included. please help. 240sx stalling problem - YouTube

03-01-2012, 04:49 PM	#13
Vitzio240sx Leaky Injector Join Date: Feb 2011 Location: FL Posts: 121 Trader Rating: (1) Feedback Score: 1 reviews	check throttle position sensor, mines had the same problem... and new tps fixed it __________________ "Men with guts attack those corners!"-Keiichi Tsuchiya

02-25-2012, 11:49 AM	#2
Schwiegz Leaky Injector Join Date: Dec 2009 Location: Alberta Bound Age: 34 Posts: 53 Trader Rating: (1) Feedback Score: 1 reviews	have you considered going back to a stock maf and seeing what happens?

02-25-2012, 01:15 PM	#4
trevor34 Zilvia Junkie Join Date: May 2007 Location: iowa Age: 38 Posts: 459 Trader Rating: (6) Feedback Score: 6 reviews	Just a stock maf? Even with continuity doesn't mean everything is ok. Could be a wire hanging on with one strand of wire. Try looking for splits or just make a jumper wire and see if it solves your issue.

02-25-2012, 03:06 PM	#6
Buntaseightsix Join Date: Feb 2012 Location: 661 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	havent tried the jumper cable yet since i need a ride to go buy some wires......anyone else have any ideas as to what it might be?

02-25-2012, 06:55 PM	#7
trevor34 Zilvia Junkie Join Date: May 2007 Location: iowa Age: 38 Posts: 459 Trader Rating: (6) Feedback Score: 6 reviews	It has to be the maf because your car should die when you disconnect the maf while its running, well it does on my s14 anyways. I'd try the jumper its quick and easy to do you don't need to even cut the wires just pull the wire cover back and jump it straight to the ecu.

02-28-2012, 05:59 PM	#9
ma.jomaa Zilvia Addict Join Date: Jan 2011 Location: SoCAL San Fernando valley Age: 38 Posts: 648 Trader Rating: (3) Feedback Score: 3 reviews	I had the same problem with mine and it turned out to be fouled spark plugs, Not sure if its going to be the same with you but it doesn't hurt to check them. GL

02-28-2012, 09:23 PM	#11
Buntaseightsix Join Date: Feb 2012 Location: 661 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	Just changed the spark plugs and still nothin, anyone know if the car would run if the fuel pump had a bad ground?

03-01-2012, 04:37 PM	#12
Buntaseightsix Join Date: Feb 2012 Location: 661 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	Bump....anyone who could help?

03-03-2012, 01:56 PM	#14
Buntaseightsix Join Date: Feb 2012 Location: 661 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	I had good reading on the old tps but changed it with a new one and still the same thing.....really frustrated at this point, anyone else?

03-03-2012, 02:10 PM	#15
Mishkin_707 Zilvia Addict Join Date: Jul 2009 Location: everywhere Age: 43 Posts: 732 Trader Rating: (1) Feedback Score: 1 reviews	Have you cleaned your actual air filter? Checked you CTS? how's your battery/alternator? Any loose/dirty grounds? Fuel injectors leaking? Can you smell raw fuel in the cylinder after pulling spark plugs?

03-04-2012, 10:43 AM	#17
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 42 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	How about wrong maf sensor for the ECU? Has it ever run correctly with that combo? If the engine has good compression, correct ignition timing, and correct fuel quantity per cylinder event, then it will run right. You hit the gas, what happens with the maf? The maf voltage spikes, the ECU responds by increasing fueling based on a non-linear map that is charted based on MAF voltage. If the maf sends the wrong voltage (incorrect maf, bad maf, airflow breach, bad wiring) then fueling will be wrong also.