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 > Chat

Chat General Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 02-12-2017, 03:44 PM   #1
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Angry High HC at 15 MPH? 240sx S13 Emissions Test

The dreaded California emissions test strikes yet again....

So i bought my S13 back in (2015) and it was registered and said to "pass smog", so I went to smog it for change of ownerships and what not and then it got "Gross polluter". I drove it like that for a year because the registration was still current at the time. I failed emission all across the board from HC,CO, and NOx in (2016). I knew that the catalytic converter was one of the main causes because it probably hasn't been replaced since the dinosaur ages.

Anyways, I finally went to smog it again (01/15/17) with my free retest before I went back up to college. I knew it wasn't going to pass, but I need a moving permit from the DMV to take my car with me to college to fix it. Before going back in to smog, I seafoamed it, then replaced the sparkplugs, sparkplug wires, O2 sensor, fuel filter, oil filter, air filter, did and oil change, been running 91 gas ever since. These caused my emission number to drop alot! But I still didn't pass ( I knew I wasn't going to pass because I had yet to replace my catalytic converter).

Finally, Im back in school and I get the Catalytic Converter installed from a local shop (great shop!). So yesterday (02/12/17) I take my car to get smogged at a shop in Milpitas. My numbers were great, but I STILL DIDNT PASS...
So I passed everything in the functional and visual, But for emissions, I failed only the HC at 15mph (Passed at 25mph). I passed everything else and the Cat is doing its job with the NOx and the CO, but what is causing my HC to be twice as high at 15mph?! Keep in mined, everything else is practically new that I changed.

Also, I noticed every time I drive long distances, I notice two spots of oil or some type of liquid on top of my intake (pictures), I don't know where it comes from? and I don't know if oil is shooting form the crankcase or something? Could that be the cause of the high HC because of unburned fuel?

The pictures below show my emission numbers from Gross Polluter to an almost Pass and the oil spot in the engine bay, if you could check those out that would be great!

I've been doing research but I still don't know what it could be ? maybe the timing, unburned fuel, leaks, compression, clogs, ahh, Any Suggestions?
Attached Images
File Type: jpg smog 1.jpg (71.9 KB, 30 views)
File Type: jpg smog 2.jpg (52.2 KB, 21 views)
File Type: jpg smog 3.jpg (80.8 KB, 23 views)
File Type: jpg smog4.jpg (62.9 KB, 37 views)
File Type: jpg smog 5.jpg (60.3 KB, 32 views)
File Type: jpg smog 6.jpg (67.4 KB, 33 views)
nakaathony is offline   Reply With Quote
Sponsored Links
Old 02-12-2017, 11:53 PM   #2
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
bump, does anyone know what it could be ?
nakaathony is offline   Reply With Quote
Old 02-13-2017, 12:04 AM   #3
andisan
Nissanaholic!
 
andisan's Avatar
 
Join Date: Oct 2007
Location: Lompoc CA 805!!!!
Age: 37
Posts: 2,049
Trader Rating: (12)
andisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymore
Feedback Score: 12 reviews
I always say that black box next to the header

Take that off and clean it really good

That gave me headaches and I ended up buying a new one instead of cleaning it, it was full of carbon and I could of just cleaned it

But at the time is was like F it

Try that
__________________
andisan is offline   Reply With Quote
Old 02-13-2017, 01:49 PM   #4
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by andisan View Post
I always say that black box next to the header

Take that off and clean it really good

That gave me headaches and I ended up buying a new one instead of cleaning it, it was full of carbon and I could of just cleaned it

But at the time is was like F it

Try that
By the black box do you mean the AIV(Air Intake Valve) that connects to the intake?
nakaathony is offline   Reply With Quote
Old 02-13-2017, 05:11 PM   #5
andisan
Nissanaholic!
 
andisan's Avatar
 
Join Date: Oct 2007
Location: Lompoc CA 805!!!!
Age: 37
Posts: 2,049
Trader Rating: (12)
andisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymoreandisan is not welcome here anymore
Feedback Score: 12 reviews
High HC at 15 MPH? 240sx S13 Emissions Test

Quote:
Originally Posted by nakaathony View Post
By the black box do you mean the AIV(Air Intake Valve) that connects to the intake?



I looked it up and it's the "PAIR VALVE"
IMG_1480.JPG
__________________
andisan is offline   Reply With Quote
Old 02-13-2017, 10:23 PM   #6
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Thumbs up

Quote:
Originally Posted by slider2828 View Post
Stuff dropping from intake is probably water.... Check your coolant hoses....

Also you made sure to drive the car around before testing right? Don't test on cold engine and parts.....

Clean out all the emissions stuff like andisan said...
Quote:
Originally Posted by andisan View Post
I looked it up and it's the "PAIR VALVE"
Attachment 98023
alright! thanks so much for searching it up and double checking ! I will be cleaning that up soon
nakaathony is offline   Reply With Quote
Old 02-13-2017, 11:13 AM   #7
slider2828
Premium Member
 
slider2828's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Posts: 5,824
Trader Rating: (13)
slider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfectionslider2828 is close to perfection
Feedback Score: 13 reviews
Stuff dropping from intake is probably water.... Check your coolant hoses....

Also you made sure to drive the car around before testing right? Don't test on cold engine and parts.....

Clean out all the emissions stuff like andisan said...
__________________
Turn and Burn!
slider2828 is offline   Reply With Quote
Old 02-13-2017, 01:56 PM   #8
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by slider2828 View Post
Stuff dropping from intake is probably water.... Check your coolant hoses....

Also you made sure to drive the car around before testing right? Don't test on cold engine and parts.....

Clean out all the emissions stuff like andisan said...
Yea I drove the car before I took it in, drove it for a good while 30+ mins. and i'm running 91 gas (Usually shell or something), also the last 3 smogs I got for the HC in order were from 157, 137, and then 138 with a max of 68 ppm. The cats are working great (smog guy said), theres just another problem. Ill clean out the black box before taking it back

And theres stuff that always comes onto the intake, like two circles on different sides (picture), I don't know what it is? It's not dripping from the intake, but onto the top of the intake?
nakaathony is offline   Reply With Quote
Old 02-13-2017, 02:01 PM   #9
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by slider2828 View Post
Stuff dropping from intake is probably water.... Check your coolant hoses....

Also you made sure to drive the car around before testing right? Don't test on cold engine and parts.....

Clean out all the emissions stuff like andisan said...
Yea I drove the car before taking it in and I put 91 gas in it(Usually shell), the smog guy said the cat is working fine, but theres another problem. But ill be cleaning out that black box and probably some other emissions stuff before taking it back. My numbers for HC for the last three smogs at 15mph in order were 157, 137, then 138 with a max of 68.

Also, there is stuff dripping onto the intake, not dripping from it. I don't know what it could be ? maybe it is water?
nakaathony is offline   Reply With Quote
Old 02-13-2017, 11:46 AM   #10
silviaks2nr
Nissanaholic!
 
silviaks2nr's Avatar
 
Join Date: Nov 2004
Location: SC
Posts: 2,105
Trader Rating: (10)
silviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymoresilviaks2nr is not welcome here anymore
Feedback Score: 10 reviews
Your motor probably needs valve stem seals. Not a huge job and you can do it with the head on.
__________________
'98 240sx 5spd
silviaks2nr is online now   Reply With Quote
Old 02-13-2017, 03:34 PM   #11
Smurf_240SX
Zilvia Addict
 
Smurf_240SX's Avatar
 
Join Date: Aug 2006
Location: So Cal- I.E
Age: 32
Posts: 879
Trader Rating: (9)
Smurf_240SX has made poor choicesSmurf_240SX has made poor choicesSmurf_240SX has made poor choicesSmurf_240SX has made poor choicesSmurf_240SX has made poor choicesSmurf_240SX has made poor choices
Feedback Score: 9 reviews
Send a message via AIM to Smurf_240SX
Did the technician warm up the cat before doing the test? Warm it up @2500RPM for about a min or 2 before you test it.

Also I'd say advancing your timing on distributor +2 degrees (you'll still be within specs) will bring your HCs down.
__________________

FS OEM RB25 PARTS
Smurf_240SX is offline   Reply With Quote
Old 02-13-2017, 10:26 PM   #12
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by Smurf_240SX View Post
Did the technician warm up the cat before doing the test? Warm it up @2500RPM for about a min or 2 before you test it.

Also I'd say advancing your timing on distributor +2 degrees (you'll still be within specs) will bring your HCs down.
Yea it was warm when I got there and he warmed it up before testing, But timing is something that I will look at. I might just rent a timing gun from Autozone to check the timing to see if the previous owner messed with it or not.
nakaathony is offline   Reply With Quote
Old 04-26-2017, 02:22 AM   #13
nakaathony
 
Join Date: Feb 2017
Location: Stockton/San Jose
Posts: 8
Trader Rating: (0)
nakaathony is an unknown quantity at this point
Feedback Score: 0 reviews
Unhappy Didint pass yet again (thank God for free retest lol)

Okay! sorry for the late update (college) so something came in mind, I replaced my o2 sensor again and this time the HC numbers went even high and faild at both 15 mph and 25 mph, could it have something to do with my fuel injectors? me and my dad checked the voltage in my injectors and they all seem pretty fine! all in all, the main point is that my car isn't burning fuel correctly?
p.s. I found this on a smog article online, and I think this is most likely what is happening in my engine? any suggestions?

Lean Fuel Mixture - Any condition which will cause unmetered air to enter the intake manifold, and ultimately the combustion chambers, will cause high hydrocarbons (HC). This condition is called a lean miss-fire. Such faults as vacuum leaks and gasket leaks will cause lean fuel/air mixtures. Broken, disconnected or misrouted vacuum hoses will do the same. It is also important to note that many engine components rely on engine vacuum for proper operation. If any of these components are defective, externally or internally, they may cause large vacuum leaks as well. A good example of such a component is your vehicle's power brake booster.
nakaathony is offline   Reply With Quote
Old 04-26-2017, 11:01 AM   #14
1on1
Post Whore!
 
1on1's Avatar
 
Join Date: Aug 2005
Location: Norcal
Posts: 3,314
Trader Rating: (15)
1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all1on1 is a name known to all
Feedback Score: 15 reviews
Try this as this helped out a lot of people back in the day.

http://zilvia.net/f/showthread.php?t=372184&page=2

Post #58. The original post no longer has photos of where to clean but there's a lot of information about failed smog.
__________________
instagram
1on1 is offline   Reply With Quote
Reply

Bookmarks

Tags
help 240sx, help a kid out, smog, smog california, what do you do


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 02:29 PM.


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