HELP!, SR is undriveable My A/F ratio is all over the place!!*****Got VIDEOS!*** - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

redsx13 · 01-28-2009, 03:57 PM

Like the post says, SR runs horribly, This issue renders my car undriveable and I have been dealing with this issue for over a year, I have spent thousands and thousands of dollars trying to fix it with no luck at all. I am just about ready to push this thing off of a cliff.

The videos i have are at 2000 and 3000 rpms, but car will act like this at all rpms, there is just no need to take that many videos. (note: i am holding the rpms very very steady, the tach is fixed at 2 and 3 thousand, motor is not revving)

2000 rpms (exactly)

http://s279.photobucket.com/al...4.flv

3000 rpms (exactly)

http://s279.photobucket.com/al...5.flv

Idle (if you notice, it takes a longggg time for the car to make it back to 14)

http://s279.photobucket.com/al...7.flv

*slider2828* · 01-28-2009, 04:18 PM

Do I get thousands and thousands of dollars to fix it?

*slider2828* · 01-28-2009, 04:20 PM

you have vacuum leak and check for that....

you have a shitty mass airflow sensor....

you have an intake leak....

Check for those things in that order...

redsx13 · 01-28-2009, 05:32 PM

Quote:

Originally Posted by slider2828

you have vacuum leak and check for that....

you have a shitty mass airflow sensor....

you have an intake leak....

Check for those things in that order...

- Just did a boost leak test (how do i check for a vacuum leak?)
- Not my maf or maf wires
- no intake leak

*slider2828* · 01-28-2009, 05:35 PM

Not that many vacuum hoses... Pull and check each one....

Did you swap mafs? to find out?

redsx13 · 01-29-2009, 12:21 AM

Quote:

Originally Posted by slider2828

Not that many vacuum hoses... Pull and check each one....

Did you swap mafs? to find out?

all the vacuum hoses are brand new.but i double checked anyway. all good

yes i swapped mafs (works for sure), and ran new wires.

Slideways^Jordan · 01-29-2009, 12:26 AM

you need a new tune! if you have a tune and check the gap on your spark plugs!

redsx13 · 01-29-2009, 12:45 AM

Quote:

Originally Posted by Slideways^Jordan

you need a new tune! if you have a tune and check the gap on your spark plugs!

Sparkplugs and gaps are good, coil packs and coil pack harness is also good

I brought it to a tuning shop for a tune but they couldn't fix the problem. They had it for over a week and still couldn't get it to run properly. They checked almost every major component; they also threw a power fc on it to tune it with, but no luck at all. (1. this was before I got the A/F gauge so they could not see exactly what was going on mixture wise. 2. For the tune, they just messed with it at idle, they never dyno'd it.)

You would think that if it just needed a tune, it would either be rich or lean, not fluctuate like that. Do you really think it sounds like a tune issue? Personal experience?

Erjay1 · 01-29-2009, 07:29 AM

So what shld your a/f be at idle???

Sileighty_85 · 01-29-2009, 08:56 AM

Maybe have a Vac leak After the MAF

The turbo's Stock Rubber intake pipe has a hole in it for the Crank case/Valve cover breather line.

Make sure it pluged

on a side note sounds like your timing chain is loose or you lifters need to be blead bad

redsx13 · 01-29-2009, 12:43 PM

Quote:

Originally Posted by Erjay1

So what shld your a/f be at idle???

like 14. something 10 is really really rich.

Quote:

Originally Posted by Sileighty_85

Maybe have a Vac leak After the MAF

The turbo's Stock Rubber intake pipe has a hole in it for the Crank case/Valve cover breather line.

Make sure it pluged

on a side note sounds like your timing chain is loose or you lifters need to be blead bad

No boost leaks at all

My timing chain does seem a little loose, but the sound you hear is the dash, steering column, and gauges rattling. The car runs really rough. solid motormounts dont help either.

Sileighty_85 · 01-29-2009, 01:07 PM

Quote:

Originally Posted by redsx13

like 14. something 10 is really really rich.

No boost leaks at all

My timing chain does seem a little loose, but the sound you hear is the dash, steering column, and gauges rattling. The car runs really rough. solid motormounts dont help either.

If your chain is loose you might have jumped a tooth on the gears

Check mechaincal timing

redsx13 · 01-29-2009, 07:33 PM

Quote:

Originally Posted by Sileighty_85

If your chain is loose you might have jumped a tooth on the gears

Check mechaincal timing

i checked it on the cam gears, whit marks on chain line up with dots on gears. couldn't see the one on the drive gear though.

Sileighty_85 · 01-31-2009, 07:27 PM

Quote:

Originally Posted by redsx13

i checked it on the cam gears, whit marks on chain line up with dots on gears. couldn't see the one on the drive gear though.

Set Crank at TDC

you should have silver links that line up on the dots
(you will have to rotate the crank abit to get them to line up properly)

If not pay attention to the #1 Cylinder Cam lobes they will face outward

then check the CAS Line up marks should be on the left dot

You wont be able to check the Cranks line up dots unless you pull the oil pump off

*slider2828* · 01-29-2009, 03:00 PM

Hmmm I dunno about timing, but its worth while to check... But if timing was off it would sound a lot worse then that, but easy enough and worth the check.

What does your spark plugs look like when you pull it out? Stick dark? White? Oily?

simplistek · 01-29-2009, 03:30 PM

usually if the car is cruising the car goes into a closed loop cycle between 14 and 15 AFR. this allows the engine to save gas and keep the engine from blowing. it looks like your car is doing the same thing but while under no load. when you say it runs horribly, can you not pass a certain RPM? or the car doesnt have power at all?

redsx13 · 01-29-2009, 07:42 PM

Quote:

Originally Posted by simplistek

usually if the car is cruising the car goes into a closed loop cycle between 14 and 15 AFR. this allows the engine to save gas and keep the engine from blowing. it looks like your car is doing the same thing but while under no load. when you say it runs horribly, can you not pass a certain RPM? or the car doesnt have power at all?

no, it will rev all the way up, it seems to lack power and only boost about 4-5 psi. Very rough, The idle also searches up and down (at most 100 rpms)

do i need to take another video of the car driving at 300 rpms?

sdrmiami · 01-31-2009, 06:53 PM

what ecu are you running? what afm you running? what pump? whats your Vacume @ on idel? email me your reply. [email protected]mail.com i would not be driving the car like that..

UNISA JECS · 01-31-2009, 08:12 PM

You dont mention yoru setup at all, but my guess is you got a stock ECU perhaps and probably running a WALBRO 255? Tell us your setup?

redsx13 · 02-01-2009, 11:27 PM

Quote:

Originally Posted by UNISA JECS

You dont mention yoru setup at all, but my guess is you got a stock ECU perhaps and probably running a WALBRO 255? Tell us your setup?

I didn't want to mention my setup because i was afraid it would skew the responces would get, i didn't want people to think it was the aftermarket parts causing the problem.

-The car origanally had 440cc injectors, z32 maf, and ecu tune. thats how i got it from japan in a clip. (It ran the same as it does now.)

-Downgraded to stock everything, (Runs the same as it does now, didn't fix the problem )

-shop told me they could fix the problem If i buy a PFC and tune the car, here is the setup now...

-Power FC D-Jetro
-No MAF
-Back to 440cc injectors
-walbro fuel pump

(P.S., shop was wrong, they tuned the car and i didn't fix anything!)

ANVIL · 02-02-2009, 10:38 AM

i wonder if they adjusted the PFC for the upgraded injectors. check that maybe

redsx13 · 02-04-2009, 03:59 PM

Quote:

Originally Posted by ANVIL

i wonder if they adjusted the PFC for the upgraded injectors. check that maybe

no, like i said in the post, it had the same problem all stock.

d-magic · 02-14-2009, 08:43 PM

it sounds like you have a vacuum leak. try hook up at the manifold.

JeremyR · 02-25-2009, 06:58 PM

did you check your fuel lines for a leak?
did you check your fuel pressure?
bad 02 sensor maybe? i dont think this is it either though.
doesnt seem to be a vacuum leak to me.

you say it ran the same on a map setup as it did on a maf setup. so that rules out alot. problem is most likely fuel related/mechanical related. you say the timing is set on everything so that should rule out mechanical shit. i would re-check the fuel system, this includes the ignition (spark) system as well. personally, i think that maybe your fuel pressure is too high, causing a rich condition, or your injectors are bad, causing a rich condition. send in your injectors to be cleaned, and tested. buy a new fpr. check all fuel lines. double check that your walbro is in good shape as well. maybe change the plugs again for shits and giggles. you say the plugs are fine, but really if your a/f ratios are this fucked than you would see some signs on the plugs...

redsx13 · 02-25-2009, 11:28 PM

1. no leak in the fuel lines
2.checked fuel pressure+replaced regulator([email protected] idle, 43.5 w/vac disconnect)
3.never checked the 02(when i unplug it the car runs richer but better[doesnt misfire as much]) wtf?
4.replaced injectors
5. plugs look a little white-ish but all consistent and not that bad.

the car idles strange too, it searches up and down from 800 to 900. and misfires at idle. the miss is inconsistent though, sometimes it misses every 2-3 seconds, sometimes it just keeps missing (around 1 second apart)

godsmack · 02-26-2009, 09:25 AM

How many wires does your 02 sensor have? With most A/F guages they won't read right unless you upgrade to the 5 wire sensor. Did you check the fuel filter? You are running lean and should def. not drive the car much. I'm not 100% with fuel pressures but 40psi sounds alittle low. Most ppl i know run atleast 60psi.

Sileighty_85 · 02-26-2009, 09:30 PM

Quote:

Originally Posted by godsmack

How many wires does your 02 sensor have? With most A/F guages they won't read right unless you upgrade to the 5 wire sensor. Did you check the fuel filter? You are running lean and should def. not drive the car much. I'm not 100% with fuel pressures but 40psi sounds alittle low. Most ppl i know run atleast 60psi.

Stock F/P is 43 psi

Jus Skott · 02-26-2009, 08:31 PM

OH shit son. your white! lol.

just wondering how long has that wide band been in car?

redsx13 · 03-01-2009, 09:49 PM

Quote:

Originally Posted by godsmack

How many wires does your 02 sensor have? With most A/F guages they won't read right unless you upgrade to the 5 wire sensor. Did you check the fuel filter? You are running lean and should def. not drive the car much. I'm not 100% with fuel pressures but 40psi sounds alittle low. Most ppl i know run atleast 60psi.

i have a wideband

Quote:

Originally Posted by Jus Skott

OH shit son. your white! lol.

???

blackej7 · 03-01-2009, 11:10 AM

Maybe theres something mechanically wrong.

have you done a compression/leakdown test?

Cant you monitor data with the power fc? check all your values, make sure everything is normal.

01-28-2009, 04:18 PM	#2
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	Do I get thousands and thousands of dollars to fix it? __________________ Turn and Burn!

01-28-2009, 04:20 PM	#3
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	you have vacuum leak and check for that.... you have a shitty mass airflow sensor.... you have an intake leak.... Check for those things in that order... __________________ Turn and Burn!

01-28-2009, 05:35 PM	#5
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	Not that many vacuum hoses... Pull and check each one.... Did you swap mafs? to find out? __________________ Turn and Burn!

01-29-2009, 08:56 AM	#10
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Maybe have a Vac leak After the MAF The turbo's Stock Rubber intake pipe has a hole in it for the Crank case/Valve cover breather line. Make sure it pluged on a side note sounds like your timing chain is loose or you lifters need to be blead bad __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

01-29-2009, 03:00 PM	#15
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,824 Trader Rating: (13) Feedback Score: 13 reviews	Hmmm I dunno about timing, but its worth while to check... But if timing was off it would sound a lot worse then that, but easy enough and worth the check. What does your spark plugs look like when you pull it out? Stick dark? White? Oily? __________________ Turn and Burn!

01-28-2009, 03:57 PM	#1
redsx13 Zilvia Junkie Join Date: Jan 2009 Location: Agoura Hills, Ca Age: 31 Posts: 572 Trader Rating: (6) Feedback Score: 6 reviews	HELP!, SR is undriveable My A/F ratio is all over the place!!***Got VIDEOS!* Like the post says, SR runs horribly, This issue renders my car undriveable and I have been dealing with this issue for over a year, I have spent thousands and thousands of dollars trying to fix it with no luck at all. I am just about ready to push this thing off of a cliff. The videos i have are at 2000 and 3000 rpms, but car will act like this at all rpms, there is just no need to take that many videos. (note: i am holding the rpms very very steady, the tach is fixed at 2 and 3 thousand, motor is not revving) 2000 rpms (exactly) http://s279.photobucket.com/al...4.flv 3000 rpms (exactly) http://s279.photobucket.com/al...5.flv Idle (if you notice, it takes a longggg time for the car to make it back to 14) http://s279.photobucket.com/al...7.flv

01-29-2009, 12:26 AM	#7
Slideways^Jordan Zilvia Member Join Date: Jan 2009 Location: Houston, Texas Posts: 191 Trader Rating: (4) Rides Gallery: Slideways^Jordan Feedback Score: 4 reviews	you need a new tune! if you have a tune and check the gap on your spark plugs!

01-29-2009, 07:29 AM	#9
Erjay1 Zilvia Junkie Join Date: Apr 2008 Location: Los Angeles Age: 35 Posts: 479 Trader Rating: (2) Feedback Score: 2 reviews	So what shld your a/f be at idle???

01-29-2009, 03:30 PM	#16
simplistek Zilvia Junkie Join Date: Mar 2007 Location: San Diego Posts: 463 Trader Rating: (7) Feedback Score: 7 reviews	usually if the car is cruising the car goes into a closed loop cycle between 14 and 15 AFR. this allows the engine to save gas and keep the engine from blowing. it looks like your car is doing the same thing but while under no load. when you say it runs horribly, can you not pass a certain RPM? or the car doesnt have power at all? __________________ v e r t e x - u s a . c o m

01-31-2009, 06:53 PM	#18
sdrmiami Zilvia Junkie Join Date: Nov 2008 Location: Miami Fl Age: 43 Posts: 518 Trader Rating: (10) Feedback Score: 10 reviews	what ecu are you running? what afm you running? what pump? whats your Vacume @ on idel? email me your reply. [email protected]mail.com i would not be driving the car like that..

01-31-2009, 08:12 PM	#19
UNISA JECS Nissanaholic! Join Date: Feb 2007 Location: Socal Fontana Age: 42 Posts: 2,372 Trader Rating: (40) Feedback Score: 40 reviews	You dont mention yoru setup at all, but my guess is you got a stock ECU perhaps and probably running a WALBRO 255? Tell us your setup? __________________ PARTS 4 SALE !! Z32 E-Brake/Parking Brake Heatshield Assemblys!!! *Rep/Feedbacks*

02-02-2009, 10:38 AM	#21
ANVIL Zilvia FREAK! Join Date: Apr 2005 Location: Anchorage, Alaska Posts: 1,173 Trader Rating: (8) Feedback Score: 8 reviews	i wonder if they adjusted the PFC for the upgraded injectors. check that maybe

02-14-2009, 08:43 PM	#23
d-magic Leaky Injector Join Date: Oct 2008 Location: Northwest Florida Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	it sounds like you have a vacuum leak. try hook up at the manifold.

02-25-2009, 11:28 PM	#25
redsx13 Zilvia Junkie Join Date: Jan 2009 Location: Agoura Hills, Ca Age: 31 Posts: 572 Trader Rating: (6) Feedback Score: 6 reviews	1. no leak in the fuel lines 2.checked fuel pressure+replaced regulator([email protected] idle, 43.5 w/vac disconnect) 3.never checked the 02(when i unplug it the car runs richer but better[doesnt misfire as much]) wtf? 4.replaced injectors 5. plugs look a little white-ish but all consistent and not that bad. the car idles strange too, it searches up and down from 800 to 900. and misfires at idle. the miss is inconsistent though, sometimes it misses every 2-3 seconds, sometimes it just keeps missing (around 1 second apart)

02-26-2009, 09:25 AM	#26
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	How many wires does your 02 sensor have? With most A/F guages they won't read right unless you upgrade to the 5 wire sensor. Did you check the fuel filter? You are running lean and should def. not drive the car much. I'm not 100% with fuel pressures but 40psi sounds alittle low. Most ppl i know run atleast 60psi.

02-26-2009, 08:31 PM	#28
Jus Skott Zilvia Member Join Date: Dec 2006 Location: Morrisville Pa. Posts: 172 Trader Rating: (1) Feedback Score: 1 reviews	OH shit son. your white! lol. just wondering how long has that wide band been in car? __________________ Looking for yard parts, PM me.

03-01-2009, 11:10 AM	#30
blackej7 Zilvia Junkie Join Date: Jul 2006 Location: Midwest Posts: 324 Trader Rating: (9) Feedback Score: 9 reviews	Maybe theres something mechanically wrong. have you done a compression/leakdown test? Cant you monitor data with the power fc? check all your values, make sure everything is normal. __________________

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