S13 SOHC Issue, weird! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240silvia · 01-05-2007, 11:48 AM

ok, sometimes the car idles ok, sometimes it sputters at idle. Evertime I try to drive it, it sputters up until about 3 grand, or somewhere around there, and then the car breaks free and takes off like nothing is wrong. Any ideas???

I'm thinking maybe tps, fuel filter, maf maybe? When I un plug the maf the car acts extremely worse! I don't really know. Any help is appreciated.

240silvia · 01-05-2007, 05:00 PM

here's an update, New coil, new spark plugs, I put a different tps on and it's all still the same. I'd say the odds of me having 2 bad TPS's are low. Gas flows through the fuel filter well, so I know it's not clogged. Clogged cat maybe? bad injector? Anyone have any ideas?

mjjstang · 01-05-2007, 07:29 PM

the only reason I would say it might be a maf issue is that around 3grand the maf actually functions. so you are getting about the opposite reaction that a bad maf normally causes. but this could help you get to your problem.

240silvia · 01-06-2007, 02:41 PM

anyone else?

john433i · 01-06-2007, 02:44 PM

Check your AIV and make sure it isn't constantly blowing hot exhaust back through the intake. I had this problem and simply removed the AIV system, and all of my low rpm problems went away.

240silvia · 01-06-2007, 04:03 PM

By AIV do you mean Air Idle Valve? Let me know, thanks, Charles

240silvia · 01-06-2007, 06:40 PM

I put a different maf off of a working car on, same thing.

Things I've changed...

Maf
New Plugs
New Plug Wires
Cat is not clogged
New Rotor button
Water Remover additive in the gas tank
New Coil
02 Sensor

Anything else?

I tried checking the engine codes on the ECU, I came up with Intake air temp sensor, which has been disconnected for a while now due to the intake. Other was the 02 sensor. So I replaced the 02 sensor, still running like shit! HELP!!!

thundering02 · 01-06-2007, 08:31 PM

Sometimes the easiest thing to do it reset the ecu completely, I the Subaru I was able to just leave the battery unplugged for something like 10mins, I will ave to second the AIV as Neither of my 240's have thiers

lestat · 01-06-2007, 09:36 PM

Might want to check your timing.

01-05-2007, 11:48 AM	#1
240silvia Nissanaholic! Join Date: Jul 2002 Location: Wilmington NC Age: 40 Posts: 2,060 Trader Rating: (3) Feedback Score: 3 reviews	S13 SOHC Issue, weird! ok, sometimes the car idles ok, sometimes it sputters at idle. Evertime I try to drive it, it sputters up until about 3 grand, or somewhere around there, and then the car breaks free and takes off like nothing is wrong. Any ideas??? I'm thinking maybe tps, fuel filter, maf maybe? When I un plug the maf the car acts extremely worse! I don't really know. Any help is appreciated.

01-05-2007, 07:29 PM	#3
mjjstang Post Whore! Join Date: Apr 2003 Location: Michigan Posts: 2,654 Trader Rating: (5) Feedback Score: 5 reviews	the only reason I would say it might be a maf issue is that around 3grand the maf actually functions. so you are getting about the opposite reaction that a bad maf normally causes. but this could help you get to your problem. __________________ I was going to, but I can not think of a sig less than 75 characters.

01-06-2007, 08:31 PM	#8
thundering02 Leaky Injector Join Date: Nov 2005 Location: St. Louis Age: 40 Posts: 98 Trader Rating: (0) Feedback Score: 0 reviews	Sometimes the easiest thing to do it reset the ecu completely, I the Subaru I was able to just leave the battery unplugged for something like 10mins, I will ave to second the AIV as Neither of my 240's have thiers __________________ 05 Chevy Colorado - DD ~108k miles 35w 5k HIDs 85 Mustang - 355 SBC

01-05-2007, 05:00 PM	#2
240silvia Nissanaholic! Join Date: Jul 2002 Location: Wilmington NC Age: 40 Posts: 2,060 Trader Rating: (3) Feedback Score: 3 reviews	here's an update, New coil, new spark plugs, I put a different tps on and it's all still the same. I'd say the odds of me having 2 bad TPS's are low. Gas flows through the fuel filter well, so I know it's not clogged. Clogged cat maybe? bad injector? Anyone have any ideas?

01-06-2007, 02:41 PM	#4
240silvia Nissanaholic! Join Date: Jul 2002 Location: Wilmington NC Age: 40 Posts: 2,060 Trader Rating: (3) Feedback Score: 3 reviews	anyone else?

01-06-2007, 02:44 PM	#5
john433i Join Date: May 2005 Location: MN Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	Check your AIV and make sure it isn't constantly blowing hot exhaust back through the intake. I had this problem and simply removed the AIV system, and all of my low rpm problems went away.

01-06-2007, 04:03 PM	#6
240silvia Nissanaholic! Join Date: Jul 2002 Location: Wilmington NC Age: 40 Posts: 2,060 Trader Rating: (3) Feedback Score: 3 reviews	By AIV do you mean Air Idle Valve? Let me know, thanks, Charles

01-06-2007, 06:40 PM	#7
240silvia Nissanaholic! Join Date: Jul 2002 Location: Wilmington NC Age: 40 Posts: 2,060 Trader Rating: (3) Feedback Score: 3 reviews	I put a different maf off of a working car on, same thing. Things I've changed... Maf New Plugs New Plug Wires Cat is not clogged New Rotor button Water Remover additive in the gas tank New Coil 02 Sensor Anything else? I tried checking the engine codes on the ECU, I came up with Intake air temp sensor, which has been disconnected for a while now due to the intake. Other was the 02 sensor. So I replaced the 02 sensor, still running like shit! HELP!!!

01-06-2007, 09:36 PM	#9
lestat Join Date: Feb 2006 Location: Fresno, CA Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	Might want to check your timing.