no spark and possible no fuel please help - Page 3 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mnmax · 02-07-2008, 03:23 AM

Quote:

Originally Posted by moses

hey thanks a lot. i just got a aem wideband 02 sensor in and i am running lean when it is cold and hot and even thru boost. its stays around 18 the whole time. it gets a little richer when i shift but then it goes lean hardcore. anybody know what i can do before i murder my pistons?

lower your boost................

moses · 02-07-2008, 04:16 AM

i never raised my boost. i am at stock boost. i think its my iac valve. does anyone know what i could clean with and if it is easy to take out and do i have to seal it when i put it back on? thanks in advance

mnmax · 02-07-2008, 04:34 AM

alright... so your not getting enough fuel... hmmm.... have you made sure that your injectors are clean? and if so, then check the vacuum going to your fuel pressure regulator.

moses · 02-08-2008, 12:18 AM

i think my fuel is good and injectors are good so im going take off the iacv and clean it off. another question is how are you suppose to hook up a relay. there are 4 numbers and i know one is ground, power, acc, and one goes to the actual product. right?

moses · 02-11-2008, 04:03 PM

alright i opened up my iac valve and it looked pretty clean. how do i test it out to see if its working. i tried to just try the key to acc to see if anything would happen and nothing did. is that normal? and does anyone know how to pull codes out of a j4 ecu?

moses · 02-11-2008, 04:47 PM

does anyone know how to test either one?

mnmax · 02-11-2008, 10:03 PM

Quote:

Originally Posted by moses

alright i opened up my iac valve and it looked pretty clean. how do i test it out to see if its working. i tried to just try the key to acc to see if anything would happen and nothing did. is that normal? and does anyone know how to pull codes out of a j4 ecu?

unless you know anybody with a conzult diagnostic program, you'll have to take your car to a nissan dealer or specialist. i'm not exactly too sure but i believe the j4 ecu doesn't have the 2 led indicators for diagnostic trouble shooting. but check it out anyways and see. whatever led's blink is a 2-digit number, after that your going to have to look up what that number is. i would check for that before you take it in since the shops will probably charge you about $50 per session

moses · 02-12-2008, 03:58 PM

no my ecu dosent have anything.

mnmax · 02-12-2008, 07:26 PM

Quote:

Originally Posted by moses

no my ecu dosent have anything.

when looking at your ecu you need to check for a couple things. some nissan ecu's have a small cut out opening on the side where you can spot the two led's and an adjustment screw where you turn it to switch it into diagnostic mode. others you may have to remove the cover to get to the same thing. if they have neither, then yeah i would definitely have to bring it to your local nissan specialist for them to do the diagnostic. or if yoiu're adventurous enough i would suggest buying the program for yourself. it comes with the disc that you can load in your laptop and the diagnostic cable that plugs both into your laptop and diagnostic port in your car. it'll run you around $500 but it does pay off to have in the long run. not to mention you can charge your buddies to do diagnostics on their nissans as well.

moses · 02-24-2008, 02:01 PM

ok i just replaced my iac valve, battery, and alternator and now my idle is better but i am still running lean. i changed my spark plugs and everything. i seem to run rich after i let off the gas and my throttle is closed. can someone help me out. and also there is a small little nipple under my throttle body. does anyone know where this goes?

moses · 02-25-2008, 05:36 PM

anyone got any guesses

moses · 02-25-2008, 06:12 PM

how do you check for an exaust leak?

moses · 02-26-2008, 06:35 PM

y am i running lean at closed throttle

moses · 02-28-2008, 03:53 PM

does no one really know

johngriff · 02-28-2008, 04:01 PM

Did you ever calibrate the Wideband? Have you checked it against other widebands to confirm its accuracy? It IS THE AEM UNIT.

Did you do your timing setup and tps setup procedure correctly? Data Log some loaded runs? Go take it for a few dyno pulls and ask the dyno operator what he thinks.

moses · 03-01-2008, 08:37 PM

i did not mess with the timing or the tps. the sticker was still on the cas so i diddnt mess with it. my idle is good. how would i mess with the tps

johngriff · 03-01-2008, 08:42 PM

Yeah, check timing and TPS voltage.

moses · 03-01-2008, 08:50 PM

can you tell me how to do that

moses · 03-29-2008, 02:33 PM

i am still running lean. is 39 psi ok when im at idle with vacume. what is stock suppose to be and is it suppose to drop to about 35psi when i let go of the throttle after reving it up?

moses · 05-15-2008, 07:47 PM

update. ok i changed out the mafs and now i am running rich. i thought i had weak spark so i changed the ignitor and it runs the same. i am so tired of this car. i also have a afc neo on my car now that is set to stock settings. does anyone know what is wrong with my car.

moses · 05-16-2008, 06:22 PM

i just did a couple of tests and this is what i got.
everything pluged in started and ran rich ,12's and under,reved past 2500, unpluged each spark plug and each changed idle
unplugged maf and ran at 14's for a second and then went back to rich
car warmed, maf and afc neo unpluged still ran rich. plugged in maf and no difference, cant rev past 2500. plugged in afc neo and died instantly.
wont start with neo plugged in now. i guess because maf signal is ran thru the neo.
does anyone know what my problem is. i changed a lot of bulshit so there cant be much more. changed ignitor,mafs,iacv,
only thing i havent changed out was temp sensor,but my temp gauge works if that counts
HELP PLEASE. I AM TIRED OF THIS CAR

moses · 05-17-2008, 10:03 AM

somebody help me out. i dont know where to look

moses · 05-17-2008, 04:25 PM

my fuel pressure is at 41 with vacume and 47 without. i know this is high but is it enough to make my fuel ratio go to the 10's and make my car run shitty

moses · 05-20-2008, 11:13 AM

anyone know if 4 psi can make me run rich. also what should my mafs read on my afc neo

miggypq21 · 05-20-2008, 12:11 PM

4 PSI of boost? If so then yes you will definitely run rich bro. I'm not sure how it is for SR's but your MAFS should read close to 5 volts with KOEO, with KOER it should be reading close to 1 volt, do you know what it's reading

moses · 05-21-2008, 01:05 PM

i was talking about 4 psi of fuel pressure. i dont know how to read the mafs voltage. can someone help me out there? and could timing make me run rich? when a car goes into limp mode does it even affect timing. my car is shitty if my maf is plugged in and doesnt even start when its warmed but is always running rich.

cincyse_ryan · 05-21-2008, 01:43 PM

your fuel pressure should be at around 36 w/ vaccum line off... 42-44 with it on...
if you haven't messed with the timing, it should be fine, but you need to check your CAS position to be sure.
what is your wideband reading at full throttle?

moses · 05-21-2008, 05:28 PM

i think you have it backwards but a lot of people are telling me that that is not the problem. the cas has not been moved since the sticker is still on it. I cant get my car warm and run it because it turns off with the maf in. it is a used maf so does anyone think that is a bad maf and someone lied and said it was good.

moses · 05-22-2008, 10:16 AM

i plugged in my afc neo and it said that my maf input voltage was 5.2 and my out voltage was 5.2. the book doesnt say if that is normal. does anyone know if that is what it is suppose to be at? im broke but i think i am going to break down and buy a fpr. anyone know of place to get it cheap and is it ok to go with megan?

moses · 05-22-2008, 09:03 PM

ok now i just read that i am maxing out my maf. how the hell am i doing this with the car not even running. i know for a fact that i ran the wires right and shielded them. could it be the maf. im just going to run 1 wire outside the car from the b/w in the maf to the afc and to the ecu. if its still wrong there is nothing i can do.

02-07-2008, 04:34 AM	#63
mnmax Zilvia Member Join Date: Nov 2007 Location: in the Marines now... upstate NY Age: 40 Posts: 194 Trader Rating: (0) Feedback Score: 0 reviews	alright... so your not getting enough fuel... hmmm.... have you made sure that your injectors are clean? and if so, then check the vacuum going to your fuel pressure regulator. __________________ GIGGITY GIGGITY GIGGITY GOOOO!!!!

02-28-2008, 04:01 PM	#75
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	Did you ever calibrate the Wideband? Have you checked it against other widebands to confirm its accuracy? It IS THE AEM UNIT. Did you do your timing setup and tps setup procedure correctly? Data Log some loaded runs? Go take it for a few dyno pulls and ask the dyno operator what he thinks. __________________ [email protected]

03-01-2008, 08:42 PM	#77
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	Yeah, check timing and TPS voltage. __________________ [email protected]

02-07-2008, 04:16 AM	#62
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i never raised my boost. i am at stock boost. i think its my iac valve. does anyone know what i could clean with and if it is easy to take out and do i have to seal it when i put it back on? thanks in advance

02-08-2008, 12:18 AM	#64
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i think my fuel is good and injectors are good so im going take off the iacv and clean it off. another question is how are you suppose to hook up a relay. there are 4 numbers and i know one is ground, power, acc, and one goes to the actual product. right?

02-11-2008, 04:03 PM	#65
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	alright i opened up my iac valve and it looked pretty clean. how do i test it out to see if its working. i tried to just try the key to acc to see if anything would happen and nothing did. is that normal? and does anyone know how to pull codes out of a j4 ecu?

02-11-2008, 04:47 PM	#66
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	does anyone know how to test either one?

02-12-2008, 03:58 PM	#68
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	no my ecu dosent have anything.

02-24-2008, 02:01 PM	#70
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	ok i just replaced my iac valve, battery, and alternator and now my idle is better but i am still running lean. i changed my spark plugs and everything. i seem to run rich after i let off the gas and my throttle is closed. can someone help me out. and also there is a small little nipple under my throttle body. does anyone know where this goes?

02-25-2008, 05:36 PM	#71
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	anyone got any guesses

02-25-2008, 06:12 PM	#72
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	how do you check for an exaust leak?

02-26-2008, 06:35 PM	#73
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	y am i running lean at closed throttle

02-28-2008, 03:53 PM	#74
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	does no one really know

03-01-2008, 08:37 PM	#76
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i did not mess with the timing or the tps. the sticker was still on the cas so i diddnt mess with it. my idle is good. how would i mess with the tps

03-01-2008, 08:50 PM	#78
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	can you tell me how to do that

03-29-2008, 02:33 PM	#79
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i am still running lean. is 39 psi ok when im at idle with vacume. what is stock suppose to be and is it suppose to drop to about 35psi when i let go of the throttle after reving it up?

05-15-2008, 07:47 PM	#80
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	update. ok i changed out the mafs and now i am running rich. i thought i had weak spark so i changed the ignitor and it runs the same. i am so tired of this car. i also have a afc neo on my car now that is set to stock settings. does anyone know what is wrong with my car.

05-16-2008, 06:22 PM	#81
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i just did a couple of tests and this is what i got. everything pluged in started and ran rich ,12's and under,reved past 2500, unpluged each spark plug and each changed idle unplugged maf and ran at 14's for a second and then went back to rich car warmed, maf and afc neo unpluged still ran rich. plugged in maf and no difference, cant rev past 2500. plugged in afc neo and died instantly. wont start with neo plugged in now. i guess because maf signal is ran thru the neo. does anyone know what my problem is. i changed a lot of bulshit so there cant be much more. changed ignitor,mafs,iacv, only thing i havent changed out was temp sensor,but my temp gauge works if that counts HELP PLEASE. I AM TIRED OF THIS CAR

05-17-2008, 10:03 AM	#82
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	somebody help me out. i dont know where to look

05-17-2008, 04:25 PM	#83
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	my fuel pressure is at 41 with vacume and 47 without. i know this is high but is it enough to make my fuel ratio go to the 10's and make my car run shitty

05-20-2008, 11:13 AM	#84
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	anyone know if 4 psi can make me run rich. also what should my mafs read on my afc neo

05-20-2008, 12:11 PM	#85
miggypq21 Zilvia Junkie Join Date: Jul 2007 Location: Houston, Texas Posts: 558 Trader Rating: (3) Rides Gallery: miggypq21 Feedback Score: 3 reviews	4 PSI of boost? If so then yes you will definitely run rich bro. I'm not sure how it is for SR's but your MAFS should read close to 5 volts with KOEO, with KOER it should be reading close to 1 volt, do you know what it's reading

05-21-2008, 01:05 PM	#86
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i was talking about 4 psi of fuel pressure. i dont know how to read the mafs voltage. can someone help me out there? and could timing make me run rich? when a car goes into limp mode does it even affect timing. my car is shitty if my maf is plugged in and doesnt even start when its warmed but is always running rich.

05-21-2008, 01:43 PM	#87
cincyse_ryan Leaky Injector Join Date: Feb 2008 Location: cincinnati Age: 38 Posts: 74 Trader Rating: (1) Feedback Score: 1 reviews	your fuel pressure should be at around 36 w/ vaccum line off... 42-44 with it on... if you haven't messed with the timing, it should be fine, but you need to check your CAS position to be sure. what is your wideband reading at full throttle?

05-21-2008, 05:28 PM	#88
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i think you have it backwards but a lot of people are telling me that that is not the problem. the cas has not been moved since the sticker is still on it. I cant get my car warm and run it because it turns off with the maf in. it is a used maf so does anyone think that is a bad maf and someone lied and said it was good.

05-22-2008, 10:16 AM	#89
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	i plugged in my afc neo and it said that my maf input voltage was 5.2 and my out voltage was 5.2. the book doesnt say if that is normal. does anyone know if that is what it is suppose to be at? im broke but i think i am going to break down and buy a fpr. anyone know of place to get it cheap and is it ok to go with megan?

05-22-2008, 09:03 PM	#90
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	ok now i just read that i am maxing out my maf. how the hell am i doing this with the car not even running. i know for a fact that i ran the wires right and shielded them. could it be the maf. im just going to run 1 wire outside the car from the b/w in the maf to the afc and to the ecu. if its still wrong there is nothing i can do.