serious help needed w/ SR - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TheSparo · 01-11-2006, 05:49 PM

ok, well my motor won't run well obviously, when i rev it, it acts like it won't rev, it will studder and won't go past a pretty low rpm, maybe 3k rpm, pretty sure it's not the MAF (z32) but im pretty sure it IS the TPS sensor, i just checked it, and it is now reading 5.26 on both the input and output power wires on the ECU, so i think this means it is bad?
also something weird is that i checked it before i started the car up, and it seemed somewhat normal except for WOT which was in the 5.2x range, but i was convinced that it is jumping in and out, so i started it up and tried to rev it, and it began to rev ok, but then it wouldn't rev right, then i turned the car off and checked it again, and i got the 5.26v on in and out power values...

if this doesn't sound like the culprit then PLEASE help me out
thanks...

bcrume · 01-11-2006, 08:05 PM

use the search, sounds like a leak in your intercooler piping

*fliprayzin240sx* · 01-11-2006, 09:37 PM

How sure are you that its not the MAF???

1mns13 · 01-11-2006, 11:24 PM

If it's 2500rpm, it probably is your maf. Determine your rpm cut out to eliminate the maf.

datboibrad · 01-12-2006, 09:08 AM

how does the car run without the maf vs with the maf plugged up. the most common things to check is if your maf or maf wiring is good. in my situation the maf ground wire just needed regrounding.

TheSparo · 01-12-2006, 10:40 AM

it runs worse with it disconnected, that's why i think it isn't the MAFS, and the z32 ones dont seem to go out as easily as the stock ones... but i will check the rpm later when i get home

skiboard06 · 01-12-2006, 12:30 PM

def try to reground the maf that will make it sudder just like you described

TheSparo · 01-12-2006, 06:13 PM

ok, so i reved it, and it would get up to 3k, so i assume that that means it isn't the MAFS, i also unplugged the mafs and it acted almost the exact same... so... any ideas?

TheSparo · 01-15-2006, 10:46 AM

ok i swapped mafs and it made no difference... someone give me something else to try please...

DJPimpFlex · 01-15-2006, 02:49 PM

are you running a SAFC or something to help the ECU read the Z32 maf? If not than maybe thats your problem. If not then try the TPS. Also it may be bad gas. I had a friend with that problem and it was that he let his car sit forever and the gas was bad.

TheSparo · 01-15-2006, 02:59 PM

i have a rom tuned ecu, and the car was running fine a week or so ago...

kazuo · 01-15-2006, 03:00 PM

Check for codes on the ECU.

Basics basics basics

Also, IIRC, WOT should read higher than 4.1v, so that reading is fine.

I'm with everyone else, sounds like a MAF issue.

But check codes first and go from there.

NI_YON_Zenki · 01-15-2006, 05:02 PM

Nah, this sounds electrical again, try taking the car out to drive it, if the car will run for a minute then begins to bog, then this may be the alternator relay sensor, cause the system is not recieving the proper eletricity to the system to keep the engine going past a specific RPM range, in your case; 3K or so. .. .

I suggest you troubleshoot your wiring setup, make sure ALL plugs are correctly wired togetherand are not touching, if this isn't it then it may be

TheSparo · 01-16-2006, 04:38 PM

Quote:

Originally Posted by kazuo

Check for codes on the ECU.

Basics basics basics

Also, IIRC, WOT should read higher than 4.1v, so that reading is fine.

I'm with everyone else, sounds like a MAF issue.

But check codes first and go from there.

i wrote earlier how i swapped z32 mafs and it didn't make a difference... so that can't be it...

i guess i'll check all plugs and wiring over again... and voltage to TPS...

Flybert · 01-16-2006, 04:45 PM

What's your timing set to? Is the CAS stabbed properly. Double check your wiring with the heavythrottle guide. Do you have a boost gauge? Is it reading boost at idle? Sorry I didn't respond to your PM. Been busy as hell.

Was this a spontaneous new problem or is this a new swap?

01-11-2006, 05:49 PM	#1
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	serious help needed w/ SR ok, well my motor won't run well obviously, when i rev it, it acts like it won't rev, it will studder and won't go past a pretty low rpm, maybe 3k rpm, pretty sure it's not the MAF (z32) but im pretty sure it IS the TPS sensor, i just checked it, and it is now reading 5.26 on both the input and output power wires on the ECU, so i think this means it is bad? also something weird is that i checked it before i started the car up, and it seemed somewhat normal except for WOT which was in the 5.2x range, but i was convinced that it is jumping in and out, so i started it up and tried to rev it, and it began to rev ok, but then it wouldn't rev right, then i turned the car off and checked it again, and i got the 5.26v on in and out power values... if this doesn't sound like the culprit then PLEASE help me out thanks... __________________ 89 240 SR powered... ummm i promise its stock

01-11-2006, 09:37 PM	#3
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	How sure are you that its not the MAF??? __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

01-11-2006, 11:24 PM	#4
1mns13 Leaky Injector Join Date: May 2004 Location: Freedomland Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	If it's 2500rpm, it probably is your maf. Determine your rpm cut out to eliminate the maf. __________________ www.the-nissan-240sx.com

01-12-2006, 10:40 AM	#6
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	it runs worse with it disconnected, that's why i think it isn't the MAFS, and the z32 ones dont seem to go out as easily as the stock ones... but i will check the rpm later when i get home __________________ 89 240 SR powered... ummm i promise its stock

01-12-2006, 06:13 PM	#8
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	ok, so i reved it, and it would get up to 3k, so i assume that that means it isn't the MAFS, i also unplugged the mafs and it acted almost the exact same... so... any ideas? __________________ 89 240 SR powered... ummm i promise its stock

01-11-2006, 08:05 PM	#2
bcrume Zilvia Member Join Date: Apr 2004 Location: San Jose, CA Posts: 177 Trader Rating: (0) Feedback Score: 0 reviews	use the search, sounds like a leak in your intercooler piping

01-12-2006, 09:08 AM	#5
datboibrad Zilvia Addict Join Date: Aug 2005 Location: tx Posts: 636 Trader Rating: (1) Feedback Score: 1 reviews	how does the car run without the maf vs with the maf plugged up. the most common things to check is if your maf or maf wiring is good. in my situation the maf ground wire just needed regrounding.

01-12-2006, 12:30 PM	#7
skiboard06 Leaky Injector Join Date: Mar 2005 Location: Cincinnati Posts: 115 Trader Rating: (0) Feedback Score: 0 reviews	def try to reground the maf that will make it sudder just like you described

01-15-2006, 10:46 AM	#9
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	ok i swapped mafs and it made no difference... someone give me something else to try please... __________________ 89 240 SR powered... ummm i promise its stock

01-15-2006, 02:49 PM	#10
DJPimpFlex Post Whore! Join Date: Jan 2004 Location: Rohnert Park, CA Age: 39 Posts: 6,158 Trader Rating: (115) Rides Gallery: DJPimpFlex Feedback Score: 115 reviews	are you running a SAFC or something to help the ECU read the Z32 maf? If not than maybe thats your problem. If not then try the TPS. Also it may be bad gas. I had a friend with that problem and it was that he let his car sit forever and the gas was bad. __________________

01-15-2006, 02:59 PM	#11
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	i have a rom tuned ecu, and the car was running fine a week or so ago... __________________ 89 240 SR powered... ummm i promise its stock

01-15-2006, 03:00 PM	#12
kazuo Post Whore! Join Date: Aug 2002 Location: Posts: 2,762 Trader Rating: (3) Feedback Score: 3 reviews	Check for codes on the ECU. Basics basics basics Also, IIRC, WOT should read higher than 4.1v, so that reading is fine. I'm with everyone else, sounds like a MAF issue. But check codes first and go from there.

01-15-2006, 05:02 PM	#13
NI_YON_Zenki Zilvia Addict Join Date: Mar 2004 Location: Riverside, California Posts: 885 Trader Rating: (2) Feedback Score: 2 reviews	Nah, this sounds electrical again, try taking the car out to drive it, if the car will run for a minute then begins to bog, then this may be the alternator relay sensor, cause the system is not recieving the proper eletricity to the system to keep the engine going past a specific RPM range, in your case; 3K or so. .. . I suggest you troubleshoot your wiring setup, make sure ALL plugs are correctly wired togetherand are not touching, if this isn't it then it may be __________________ "GHOST"

01-16-2006, 04:45 PM	#15
Flybert Post Whore! Join Date: Mar 2003 Location: none Posts: 3,862 Trader Rating: (7) Feedback Score: 7 reviews	What's your timing set to? Is the CAS stabbed properly. Double check your wiring with the heavythrottle guide. Do you have a boost gauge? Is it reading boost at idle? Sorry I didn't respond to your PM. Been busy as hell. Was this a spontaneous new problem or is this a new swap?