Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk

Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 09-10-2017, 09:17 PM   #1
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Sr leaning out and misfiring at wide open throttle

Just got my car running and driving again a month or so ago and it was running just like it always had 11.5-12:1 afr and no breaking up at high rpm but I let it sit for a couple weeks during my final bout trip and tried it out today and was going 16:1+ lean at anything over 3/4 throttle and breaking up after 4-5k rpm

Haven't messed with it again yet as the car is at my parents house 40 min away but trying to get a list of ideas together to test for when I go back to mess with it

So far I plan on checking fuel psi, voltage at fuel pump power and plugs.

Combo is an s13 sr, s14 t28 bb, 550cc injectors, z32 maf, FMIC and enthalpy ecu tuned for the mods. Fuel pump is also hardwired and has been for the last two years so nothing new there
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Sponsored Links
Old 09-11-2017, 08:06 AM   #2
tuzzio
Nissanaholic!
 
tuzzio's Avatar
 
Join Date: Oct 2013
Location: Western Mass.
Posts: 2,254
Trader Rating: (3)
tuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond repute
Feedback Score: 3 reviews
Gotta watch out for this cold air homie. Check the maf, if not, check out your coils. A lot of people go to LS coils (myself included so I can vouch) because the stock SR coils blow.
tuzzio is offline   Reply With Quote
Old 09-11-2017, 09:32 AM   #3
cash$addict
 
Join Date: Nov 2007
Location: Boston MA
Posts: 11
Trader Rating: (0)
cash$addict will become famous soon enoughcash$addict will become famous soon enoughcash$addict will become famous soon enoughcash$addict will become famous soon enoughcash$addict will become famous soon enough
Feedback Score: 0 reviews
i have the same problems that started after sitting, it only happens on my car when its warm out but I checked the fuel pressure under load to verify the pump wasn't cutting out, I checked all the wiring to the maf from the ecu with no issues, changed the maf, still the same. my cars an hour away so I'm in the same boat. I think its the ECU but I haven't had a chance to change it yet. let me know what you find!
cash$addict is offline   Reply With Quote
Old 09-12-2017, 05:40 PM   #4
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Quote:
Originally Posted by tuzzio View Post
Gotta watch out for this cold air homie. Check the maf, if not, check out your coils. A lot of people go to LS coils (myself included so I can vouch) because the stock SR coils blow.
Still been 70-72 up here so I don't think the weather has to do with it but I do have a couple sets of LS coils laying around that I've been meaning to wire up and get plug wires for 😅

Quote:
Originally Posted by cash$addict View Post
i have the same problems that started after sitting, it only happens on my car when its warm out but I checked the fuel pressure under load to verify the pump wasn't cutting out, I checked all the wiring to the maf from the ecu with no issues, changed the maf, still the same. my cars an hour away so I'm in the same boat. I think its the ECU but I haven't had a chance to change it yet. let me know what you find!
Will do man hoping to have some time to mess with it tomorrow
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-16-2017, 05:18 PM   #5
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Checked fuel pressure and all fuel pump wiring, car makes 13.9-14 volts while running and that's what the pump sees, fuel pressure is at 43psi

Going to swap out the fuel filter and soft lines tomorrow will update then
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-17-2017, 05:29 PM   #6
kenfuji
 
Join Date: Sep 2002
Location: NJ/NYC
Age: 46
Posts: 24
Trader Rating: (0)
kenfuji is an unknown quantity at this point
Feedback Score: 0 reviews
is it possible your CAS got loose/moved and messed your timing?
kenfuji is offline   Reply With Quote
Old 09-17-2017, 06:22 PM   #7
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Quote:
Originally Posted by kenfuji View Post
is it possible your CAS got loose/moved and messed your timing?
Yeah I gotta get a timing light to make sure it's set right and also gonna try swapping another set of 550 injectors I have in and build a boost leak tester

Swapped out fuel filter and lines today but made no difference
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-18-2017, 11:09 AM   #8
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,052
Trader Rating: (34)
jr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nice
Feedback Score: 34 reviews
Send a message via AIM to jr_ss
I suspect bad fuel. Have you added octane booster or stabilizer? Fresh gas may cure your problems.
__________________
My SR20VET
jr_ss is offline   Reply With Quote
Old 09-18-2017, 12:12 PM   #9
OutlawLui
Zilvia FREAK!
 
OutlawLui's Avatar
 
Join Date: Apr 2011
Location: Anaheim CA
Age: 35
Posts: 1,491
Trader Rating: (19)
OutlawLui is a well-known jackass
Feedback Score: 19 reviews
Don't forget to check the tps voltage open/closed
__________________
.
OutlawLui is offline   Reply With Quote
Old 09-18-2017, 04:19 PM   #10
ZenkiZenki14
Zilvia Member
 
ZenkiZenki14's Avatar
 
Join Date: Jan 2013
Location: TX
Age: 25
Posts: 152
Trader Rating: (0)
ZenkiZenki14 is an unknown quantity at this point
Feedback Score: 0 reviews
Hmmm, Mine was MAF wiring. Was corroded in some spots. If I pulled on the harness, it would cut out to the point of almost dying, in some cases it would and ran super rich. But you said you checked yours so that's out. Maybe clean the IACV and check TPS voltage as well.
ZenkiZenki14 is offline   Reply With Quote
Old 09-18-2017, 08:03 PM   #11
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Quote:
Originally Posted by jr_ss View Post
I suspect bad fuel. Have you added octane booster or stabilizer? Fresh gas may cure your problems.
Just filled it with fresh 93 but while taking my intercooler couplings off to check for boost leaks I noticed could move the CAS by hand so I picked up a timing light tonight and gonna check it tomorrow
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-18-2017, 08:04 PM   #12
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Quote:
Originally Posted by OutlawLui View Post
Don't forget to check the tps voltage open/closed
How would I do that? Can I do it with just a normal multimeter?
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-18-2017, 11:16 PM   #13
RB25GUY
Nissanaholic!
 
RB25GUY's Avatar
 
Join Date: Feb 2013
Location: NY
Age: 32
Posts: 2,013
Trader Rating: (9)
RB25GUY is a jewel in the roughRB25GUY is a jewel in the roughRB25GUY is a jewel in the roughRB25GUY is a jewel in the roughRB25GUY is a jewel in the roughRB25GUY is a jewel in the roughRB25GUY is a jewel in the roughRB25GUY is a jewel in the rough
Feedback Score: 9 reviews
Quote:
Originally Posted by 1988montecarloss View Post
How would I do that? Can I do it with just a normal multimeter?
Yeah you can .
__________________
Quote:
Originally Posted by smellslikecurry View Post
Its not like you're putting a safc in a fucking Tesla.
RB25GUY is offline   Reply With Quote
Old 09-20-2017, 09:10 AM   #14
bmxguy08
 
Join Date: Nov 2010
Location: Renton
Age: 32
Posts: 7
Trader Rating: (0)
bmxguy08 is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by 1988montecarloss View Post
How would I do that? Can I do it with just a normal multimeter?
like stated above this is very easy to do there are many videos and threads on this out there.

Set that CAS first off. Also I had this issue my car ran tits for 3 months then it startted sputtering and cutting out under high load. I re-grounded my engine to the chassis and re-grounded my coil packs and it fixed the issue.

Also pull your plugs and check for carbon build up and also check the gap on them.

Wouldn't hurt to put a relay on your fuel pump straight to the battery there are again many videos and threads on how to do this.
bmxguy08 is offline   Reply With Quote
Old 09-24-2017, 08:02 AM   #15
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Quote:
Originally Posted by bmxguy08 View Post
like stated above this is very easy to do there are many videos and threads on this out there.

Set that CAS first off. Also I had this issue my car ran tits for 3 months then it startted sputtering and cutting out under high load. I re-grounded my engine to the chassis and re-grounded my coil packs and it fixed the issue.

Also pull your plugs and check for carbon build up and also check the gap on them.

Wouldn't hurt to put a relay on your fuel pump straight to the battery there are again many videos and threads on how to do this.

Fuel pump has been hardwired with a relay for a couple years now (walbro 255) and plugs are almost new and gapped tight .020"

Also did a boost leak test and found one so gonna try to keep that from leaking today and then putting a timing light on it if I have time

Also is it better to ground the coilpacks to the engine or chassis? I've tried both and haven't noticed any difference
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-24-2017, 02:18 PM   #16
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Ok this is getting annoying, fixed all boost leaks and set timing to 15 degrees (2nd mark) with a timing light and now it runs even worse lol

Which makes me believe it's a fuel issue but the pump sees almost 14 volts and makes 43psi at the rail
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-24-2017, 03:14 PM   #17
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Just checked tps and got 0.44-0.45 closed and 4.04-4.05 open, is this within spec?
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-24-2017, 06:47 PM   #18
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,784
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
that makes it sound like timing may be a tooth off...I would check it all including each cam personally...I know its a bit of work and would be weird if that happened but sounds like mine did when was that far off...
jedi03 is offline   Reply With Quote
Old 09-24-2017, 09:05 PM   #19
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Quote:
Originally Posted by jedi03 View Post
that makes it sound like timing may be a tooth off...I would check it all including each cam personally...I know its a bit of work and would be weird if that happened but sounds like mine did when was that far off...
With the CAS turned all the way clockwise it stops misfiring and makes good power at WOT but is still lean at 15:1 and isles erratically after that, thinking maybe the CAS is stabbed in a tooth off
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-29-2017, 04:54 PM   #20
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Have checked ignition timing and checked marks on CAS and everything is timed correctly and lined up, have also ran a fuel pressure gauge and car makes perfect fuel pressure and adds psi as it should and during a pull doesn't drop pressure at all, got my new coils and maf in the mail tonight and installing those tomorrow
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 09-29-2017, 06:53 PM   #21
jdm-specs
Leaky Injector
 
Join Date: Feb 2011
Location: 626 socal
Posts: 57
Trader Rating: (3)
jdm-specs is an unknown quantity at this point
Feedback Score: 3 reviews
Hope you don't me chiming in, but it's a good thing that you check fuel pressure reading while the lean problem is there.

I think you should focus on you lean condition under load first, as it is more likely causing it to break up, seems more likely to be a fuel delivery problem when it's only lean under load, compared to ignition. Do you know if the ECM is storing any fault codes?

Although the MAF seems reasonable to swap out. Maybe a good idea to swap out a set of known good injectors and check the ECM grounds for any rodent damage since the car was sitting for awhile. Since you changed out the fuel filter and verified fuel pressure already.
jdm-specs is offline   Reply With Quote
Old 09-30-2017, 08:05 AM   #22
tuzzio
Nissanaholic!
 
tuzzio's Avatar
 
Join Date: Oct 2013
Location: Western Mass.
Posts: 2,254
Trader Rating: (3)
tuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond reputetuzzio has a reputation beyond repute
Feedback Score: 3 reviews
Check your grounds. They make the car do weird shit.

I used to have some bad issues with draw between turning my lights on and my e-fans. Added another engine to chassis ground and a alternator to chassis ground (I had some leftover 4GA wire laying around) and when I wired my fans I used separate relays and 10GA power wire and its EONS better
tuzzio is offline   Reply With Quote
Old 10-09-2017, 06:22 PM   #23
1988montecarloss
Nissanaholic!
 
1988montecarloss's Avatar
 
Join Date: Jun 2012
Location: old el paso
Age: 28
Posts: 1,979
Trader Rating: (24)
1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough1988montecarloss is a jewel in the rough
Feedback Score: 24 reviews
Checked all grounds and were all fine, also swapped out MAF and another set of injectors with no change but I did install a set of splitfire coils that made a huge difference, car runs better with them than it ever has even with a larger spark plug gap but the gauge still reads lean, can't hear the car spark knocking and plugs look good after a WOT pull so thinking my lean condition is either a faulty wideband sensor from being run super rich and like crap for so long or has to be recalibrated, do the aem uego need to be recalibrated? If not a new sensor will be my next move
__________________
IG: @Haley72692
1988montecarloss is offline   Reply With Quote
Old 10-10-2017, 08:29 AM   #24
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,784
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
they can be...aem has a faq page...when mine did that I got new sensor from autozone...had to cut out a portion of the clip I found to be similar...no issues since then!
jedi03 is offline   Reply With Quote
Old 10-21-2017, 12:01 PM   #25
nisileighty
Zilvia FREAK!
 
nisileighty's Avatar
 
Join Date: Feb 2016
Location: Seattle, WA
Posts: 1,215
Trader Rating: (4)
nisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of lightnisileighty is a glorious beacon of light
Feedback Score: 4 reviews
Not sure if this issue has been resolved but here’s my thoughts.

Since it’s an RS-Enthalpy tuned, I’m not sure if you can set the timing to 15* and call it good, as the ignition timing was probably advanced to make more power.

The TPS could also be a big problem, my SR ran like shit when it was bad. There’s plenty of sources online that show how to do this.

Lastly I’d check that you don’t have any fuel leaks, or a loose fuel clamp or something of that sort.


Sent from my iPhone using Tapatalk
nisileighty is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 04:22 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
vB.Sponsors
Copyright © 1998 - 2019, Zilvia.net™