wont rev past 3k, not MAF problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

schizorazgriz · 02-25-2009, 03:05 PM

So my S14 sr20det (s13 chassis) wont go past 3k rpm in any gear including neutral. This would normally scream MAF problem but when i unplugged my MAF at idle the car idle changed and then died so there is nothing wrong with my MAF sensor. Is there anything else that i could check that might be the problem? BTW for those of you who are wondering the MAF is a stock s14 sr20det MAF

*lok* · 02-25-2009, 03:12 PM

Try unplugging the maf and then starting the car and see if it runs.

Then plug everything back in and check the ecu for codes.

discosteak · 02-25-2009, 03:23 PM

yeah its the MAF dawg

schizorazgriz · 02-25-2009, 05:37 PM

but if i unplug my maf while the car is on it dies... doesnt that mean there is nothing wrong with it?

i heard that the ecu has different modes it can be in. could it just not be in the right mode for driving? if so how do i change it and how do i check the engine codes. all i see is one little ass screw and no leds

Chernobyl · 02-25-2009, 05:40 PM

Your car should run fine with the MAFS unplugged, but will have a 2500-3000 rpm rev limit.

Try a known good MAFS and report back. Or check for codes like previous people said. I know I had a bad MAFS once and no codes showed up.

schizorazgriz · 02-25-2009, 06:14 PM

[quote=Chernobyl;2659945]Your car should run fine with the MAFS unplugged, but will have a 2500-3000 rpm rev limit.

Ok so what does it mean if my car dies when i unplug the mafs? does that mean that theres something else wrong with it?

*lok* · 02-25-2009, 08:48 PM

sometimes it will die when you unplug the maf.

that is why i said try and start it with it unplugged. it will put the car in limp mode.

have you hooked up your consult wire?

4x4le · 02-26-2009, 03:10 AM

Quote:

Originally Posted by lok

have you hooked up your consult wire?

ding ding ding! WINNAR

I dont know how people dont live without at least having a consult cable and Nissan datascan.....

drifter_for_life06 · 02-26-2009, 03:19 AM

maf seems shot as previously stated....AAP might be able to read your codes for you

Jus Skott · 02-26-2009, 06:11 AM

might be cause i literally just woke up like 5 minutes ago. but i thought a bad TPS might cause the same thing.
~skott "mornings suck" B

Z33dori · 02-26-2009, 12:08 PM

usually the maf

my tps went bad it would just buck like a mo-fo

but when m maf went bad it wouldn't rev past 3k or so

drifter_for_life06 · 02-26-2009, 06:54 PM

if the TPS goes bad I would think it should still go past 3k, just buck and carry on and do it slowly...? maybe im wrong...?

Autobacs · 02-26-2009, 08:38 PM

If your knock sensor is bad, it will do the something similar.

schizorazgriz · 02-27-2009, 02:51 PM

So we got a possibility of a bad MAF sensor, TPS sensor, and knock sensor.....

more symptoms. turbo will spool but no boost for that few hundred rpm before it tops at 3k. virtually NO throttle response. when im sitting at a stop light and hit the gas it sits for about ten seconds before stumbling up the rpm ladder super super slow.

d-magic · 02-28-2009, 06:04 PM

Another possibility would be bad ECU. Do you have check engine light?

tep3 · 03-01-2009, 08:58 PM

the same thing happend to my car check ur intercooler piping and couplers.

schizorazgriz · 03-02-2009, 12:37 AM

OK so i fixed the throttle response problem. My fuel pressure was extrmely high and it wa flooding like a mo-fo. fixed that but my rpm will only go up to a little over 3k like 3300. When im in neutral however it will go up to 3k, drop, go up to 3500, drop, and so on and so forth. This happens while my foot is on the gas and im not letting off the throttle at all. I hope that makes sense. is the main cause still looking like the MAF sensor? I noticed that their might be a connection problem with my pcm valve.... could this maybe be it?

910noskillz · 03-02-2009, 08:02 AM

still seems like the maf, i would find someone that you could swap with.....kinda sounds similar to a boost leak also

02-25-2009, 03:05 PM	#1
schizorazgriz Join Date: Feb 2009 Location: riverside California Age: 19 Posts: 10 Trader Rating: (0)	wont rev past 3k, not MAF problem So my S14 sr20det (s13 chassis) wont go past 3k rpm in any gear including neutral. This would normally scream MAF problem but when i unplugged my MAF at idle the car idle changed and then died so there is nothing wrong with my MAF sensor. Is there anything else that i could check that might be the problem? BTW for those of you who are wondering the MAF is a stock s14 sr20det MAF

02-26-2009, 03:19 AM	#9
drifter_for_life06 Zilvia Junkie Join Date: Sep 2005 Location: Stewartstown, PA Age: 21 Posts: 450 Trader Rating: (2)	maf seems shot as previously stated....AAP might be able to read your codes for you __________________ 1992 RPS13 AEM Filter GP Sports EXAS Spec D RS*R Downpipe PILOT F/R Strut Bars Shift_sideways

02-26-2009, 06:11 AM	#10
Jus Skott Leaky Injector Join Date: Dec 2006 Location: R.VA. Posts: 101 Trader Rating: (0)	might be cause i literally just woke up like 5 minutes ago. but i thought a bad TPS might cause the same thing. ~skott "mornings suck" B __________________ AIM: skottie boi75

02-26-2009, 06:54 PM	#12
drifter_for_life06 Zilvia Junkie Join Date: Sep 2005 Location: Stewartstown, PA Age: 21 Posts: 450 Trader Rating: (2)	if the TPS goes bad I would think it should still go past 3k, just buck and carry on and do it slowly...? maybe im wrong...? __________________ 1992 RPS13 AEM Filter GP Sports EXAS Spec D RS*R Downpipe PILOT F/R Strut Bars Shift_sideways

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02-25-2009, 03:12 PM	#2
lok POSER Join Date: Jul 2003 Location: Oklahoma Posts: 455 Trader Rating: (1)	Try unplugging the maf and then starting the car and see if it runs. Then plug everything back in and check the ecu for codes.

02-25-2009, 03:23 PM	#3
discosteak Leaky Injector Join Date: Aug 2007 Location: Maryland Age: 24 Posts: 109 Trader Rating: (0)	yeah its the MAF dawg

02-25-2009, 05:37 PM	#4
schizorazgriz Join Date: Feb 2009 Location: riverside California Age: 19 Posts: 10 Trader Rating: (0)	but if i unplug my maf while the car is on it dies... doesnt that mean there is nothing wrong with it? i heard that the ecu has different modes it can be in. could it just not be in the right mode for driving? if so how do i change it and how do i check the engine codes. all i see is one little ass screw and no leds

02-25-2009, 05:40 PM	#5
Chernobyl Zilvia FREAK! Join Date: May 2003 Location: Denver, CO Age: 26 Posts: 1,409 Trader Rating: (2)	Your car should run fine with the MAFS unplugged, but will have a 2500-3000 rpm rev limit. Try a known good MAFS and report back. Or check for codes like previous people said. I know I had a bad MAFS once and no codes showed up.

02-25-2009, 06:14 PM	#6
schizorazgriz Join Date: Feb 2009 Location: riverside California Age: 19 Posts: 10 Trader Rating: (0)	[quote=Chernobyl;2659945]Your car should run fine with the MAFS unplugged, but will have a 2500-3000 rpm rev limit. Ok so what does it mean if my car dies when i unplug the mafs? does that mean that theres something else wrong with it?

02-25-2009, 08:48 PM	#7
lok POSER Join Date: Jul 2003 Location: Oklahoma Posts: 455 Trader Rating: (1)	sometimes it will die when you unplug the maf. that is why i said try and start it with it unplugged. it will put the car in limp mode. have you hooked up your consult wire?

02-26-2009, 12:08 PM	#11
Z33dori In time-out for misbehaving. Join Date: Dec 2006 Location: Lima, Ohio Age: 20 Posts: 4,058 Trader Rating: (6)	usually the maf my tps went bad it would just buck like a mo-fo but when m maf went bad it wouldn't rev past 3k or so

02-26-2009, 08:38 PM	#13
Autobacs Leaky Injector Join Date: Oct 2003 Location: Washington Posts: 68 Trader Rating: (2)	If your knock sensor is bad, it will do the something similar.

02-27-2009, 02:51 PM	#14
schizorazgriz Join Date: Feb 2009 Location: riverside California Age: 19 Posts: 10 Trader Rating: (0)	So we got a possibility of a bad MAF sensor, TPS sensor, and knock sensor..... more symptoms. turbo will spool but no boost for that few hundred rpm before it tops at 3k. virtually NO throttle response. when im sitting at a stop light and hit the gas it sits for about ten seconds before stumbling up the rpm ladder super super slow.

02-28-2009, 06:04 PM	#15
d-magic Leaky Injector Join Date: Oct 2008 Location: Northwest Florida Posts: 50 Trader Rating: (0)	Another possibility would be bad ECU. Do you have check engine light?

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03-01-2009, 08:58 PM	#16
tep3 Join Date: Jul 2008 Location: Tampa, FL Age: 22 Posts: 22 Trader Rating: (0)	the same thing happend to my car check ur intercooler piping and couplers.

03-02-2009, 12:37 AM	#17
schizorazgriz Join Date: Feb 2009 Location: riverside California Age: 19 Posts: 10 Trader Rating: (0)	OK so i fixed the throttle response problem. My fuel pressure was extrmely high and it wa flooding like a mo-fo. fixed that but my rpm will only go up to a little over 3k like 3300. When im in neutral however it will go up to 3k, drop, go up to 3500, drop, and so on and so forth. This happens while my foot is on the gas and im not letting off the throttle at all. I hope that makes sense. is the main cause still looking like the MAF sensor? I noticed that their might be a connection problem with my pcm valve.... could this maybe be it?

03-02-2009, 08:02 AM	#18
910noskillz Join Date: Mar 2009 Location: Wilm NC Age: 20 Posts: 19 Trader Rating: (0)	still seems like the maf, i would find someone that you could swap with.....kinda sounds similar to a boost leak also