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 01-20-2019, 01:27 PM   #1
Engmus
Leaky Injector
 
Join Date: Mar 2016
Location: PA
Age: 33
Posts: 104
Trader Rating: (1)
Engmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura about
Feedback Score: 1 reviews
SR20DET Miss Fire\Bucking

Hey Guys, looking for some opinions as these things are always hard to troubleshoot over the interbutts.

91 240sx\SR20 Blacktop Swap

Issue: Car bucks\misses after warming up at highway speeds. Feels like a misfire, although happens really sporadically.

Troubleshooting thus far:

TPS Reset - Good
New Fuel Filter - Good
New Spark Plugs - Good
Throttle Body\IACV Cleaned - Good
New Walbro 255 Fuel Pump - Good
Vacuum leaks - None detectable at this point, will continue to look.
Repinned CAS sensor wiring and replaced harness side plug - Good

I suspect at this point Cam Angle Sensor faulty or Igniter Faulty.

Anyone have any ideas? Things to check?
Engmus is offline   Reply With Quote
Sponsored Links
Old 01-20-2019, 01:40 PM   #2
Coupes_FTW
Leaky Injector
 
Coupes_FTW's Avatar
 
Join Date: Aug 2008
Location: Beaverton
Posts: 103
Trader Rating: (2)
Coupes_FTW is making a name for him/her selfCoupes_FTW is making a name for him/her self
Feedback Score: 2 reviews
sounds like a dying coilpack
Coupes_FTW is offline   Reply With Quote
Old 01-20-2019, 01:41 PM   #3
Engmus
Leaky Injector
 
Join Date: Mar 2016
Location: PA
Age: 33
Posts: 104
Trader Rating: (1)
Engmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura about
Feedback Score: 1 reviews
5k Miles ago I installed a set of SplitFire Coils, I have spare Splitfire Coil packs.
Engmus is offline   Reply With Quote
Old 01-20-2019, 01:48 PM   #4
Coupes_FTW
Leaky Injector
 
Coupes_FTW's Avatar
 
Join Date: Aug 2008
Location: Beaverton
Posts: 103
Trader Rating: (2)
Coupes_FTW is making a name for him/her selfCoupes_FTW is making a name for him/her self
Feedback Score: 2 reviews
clean the MAF sensor
Coupes_FTW is offline   Reply With Quote
Old 01-20-2019, 02:00 PM   #5
jdmgtom
Leaky Injector
 
jdmgtom's Avatar
 
Join Date: Aug 2018
Location: St. Petersburg, FL
Age: 28
Posts: 147
Trader Rating: (0)
jdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymorejdmgtom is not welcome here anymore
Feedback Score: 0 reviews
I had a similar problem, I think your next best thing to do is replace your ignition coils if you haven't already recently. I just bought a set of p2m's ignition coils for $140... very worth.
Also this is a long shot, but maybe check your brake calipers to see if they're sticking to the rotor, because that would make it feel like theres a boost leak or a misfire if its sticking bad. happened to me..
jdmgtom is offline   Reply With Quote
Old 01-20-2019, 03:59 PM   #6
Kingtal0n
Post Whore!
 
Kingtal0n's Avatar
 
Join Date: Jul 2005
Location: South Florida
Age: 38
Posts: 4,649
Trader Rating: (17)
Kingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond repute
Feedback Score: 17 reviews
Send a message via AIM to Kingtal0n
What does wideband say during problems?

A misfire will show up on the wideband usually and verify it is actually a misfire
Kingtal0n is offline   Reply With Quote
Old 01-21-2019, 09:32 AM   #7
frsh2fourty
 
frsh2fourty's Avatar
 
Join Date: Jan 2007
Location: Houston, Texas
Age: 31
Posts: 49
Trader Rating: (0)
frsh2fourty has a spectacular aura aboutfrsh2fourty has a spectacular aura aboutfrsh2fourty has a spectacular aura aboutfrsh2fourty has a spectacular aura aboutfrsh2fourty has a spectacular aura aboutfrsh2fourty has a spectacular aura about
Feedback Score: 0 reviews
Send a message via AIM to frsh2fourty
Check your injectors. You might have one that is slowly starting to fail. You can do it with a multimeter, I forget what the resistance is supposed to read but they should all read about the same if they are all good so a bad one will be really apparent. I had one that was intermittently sticking closed and the reading was still way off even though it wasn't completely bad.
frsh2fourty is offline   Reply With Quote
Old 01-22-2019, 05:58 AM   #8
Engmus
Leaky Injector
 
Join Date: Mar 2016
Location: PA
Age: 33
Posts: 104
Trader Rating: (1)
Engmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura about
Feedback Score: 1 reviews
Thanks for the ideas guys.

I cleaned my MAF and had no change, tested maf and it looks good.

This weekend i'll try swapping Coils, and check injectors.

I'll report back with my resolution when known.
Engmus is offline   Reply With Quote
Old 01-22-2019, 10:05 AM   #9
z31andrew
Zilvia Member
 
z31andrew's Avatar
 
Join Date: Aug 2016
Location: Orange, CA
Age: 27
Posts: 176
Trader Rating: (5)
z31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of lightz31andrew is a glorious beacon of light
Feedback Score: 5 reviews
If your car is tuned check your rom chip. The same shit was happening on my car, I have solid mounts so the chip actually vibrated out of the ECU and was causing a faulty connection, my car would buck like crazy but idles no problem.I tried swapping MAFs, coils, plugs, etc just to find it was the damn chip.
z31andrew is offline   Reply With Quote
Old 01-23-2019, 02:48 PM   #10
RomulanS13
 
Join Date: Oct 2017
Location: near salty oceans
Posts: 30
Trader Rating: (0)
RomulanS13 is an unknown quantity at this point
Feedback Score: 0 reviews
I had a really bad miss fire under load and if boost hit anything over 4psi. I replaced alt, coil packs, re did grounds, re installed CAS, adjusted TPS to factory spec and none of that worked. I Previously when first swapped the sr gapped the plugs to .028 or around that tried gapping them wider and the problem got even worse so I re gapped around .025 and all boost problems under load freeway speeds are gone no bucking or miss fire. something that simple haunted me for months until now. Hope that helps.
RomulanS13 is offline   Reply With Quote
Old 01-24-2019, 11:32 AM   #11
ultimateirving
Zilvia FREAK!
 
ultimateirving's Avatar
 
Join Date: Nov 2010
Location: arizona
Age: 33
Posts: 1,519
Trader Rating: (1)
ultimateirving is an unknown quantity at this point
Feedback Score: 1 reviews
Check grounds.

I had the one on the back of the head wiggle loose. Like mentioned above, sounds like coilpacks
__________________
Z32 with lq4 swap
Desert Street Scene || Dssevents.com
ultimateirving is offline   Reply With Quote
Old 01-28-2019, 12:21 PM   #12
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,784
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
also if theres oil pooling by the coils can cause same issue...replace vavle cover gasket
jedi03 is offline   Reply With Quote
Old 03-08-2019, 06:50 AM   #13
Engmus
Leaky Injector
 
Join Date: Mar 2016
Location: PA
Age: 33
Posts: 104
Trader Rating: (1)
Engmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura aboutEngmus has a spectacular aura about
Feedback Score: 1 reviews
I wanted to follow up on this, my problem was my TPS.

Even though the TPS would set voltage correctly, as you opened the Throttle the voltage was all over the place, sometimes it would be fine, othertimes it would be really bad.

I replaced the TPS with a genuine unit from Nissan. Moral of the story...

Just because you check voltage on the sensor at idle, doesn't mean that as you drive the vehicle it isn't a problem, it could be somewhere between totally rekt and on the way out.

Thanks all for the input and great ideas.
Engmus 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 04:07 AM.


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