High Nox emissions after rebuild - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus First Generation > SPI Performance (2000-2004)

SPI Performance (2000-2004) The place to chat about any 2.0L Split Port Injection engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
FocusFest FocusFanatics Merchandise

Reply
 
LinkBack Thread Tools Display Modes
Old 03-06-2012, 07:52 PM   #1
Focus Rookie
 
Join Date: Feb 2011
Fan#: 83065
Location: Southern, CA
What I Drive: 2001 Maroon LX

Posts: 6
FF Reputation: 1 CaliFucos Good Standing Member
Buy-Sell-Trade Rating: (0)
High Nox emissions after rebuild

Hi,
I just finished rebuilding my 2001 SPI after failing my previous emissions test for slightly too much hydrocarbons and dropping a valve seat shortly thereafter.

I had the crank turned, put new bearings, pistons, rings, timing belt, timing component kit, head with hardened valve seats, head bolts, thermostat, water pump, oil pump, and all new gaskets. I cleaned the block inside and out, deglazed the cylinders, cleaned the intake manifold, egr and throttle body. Of course I also changed the oil and filter as well. I have a new radiator, I flushed the cooling system, and I put new antifreeze. Right before it dropped the valve seat I changed the air filter and oxygen sensors.

The car was running somewhat rough at times and seemed sluggish after having done all of that, I ultimately found this to be caused by the original fuel pump module lines being brittle and cracked. After replacing the fuel pump with the newer style pump and replacing the fuel filter, the car is running like it never has.

I took it to the smog station and it failed the functional check for "MIL/Check engine light test due to failure to successfully complete all OBD self tests" which I understand was caused by the fact that I don't have enough drive cycles after resetting the computer. I am not too worried about that.

What concerns me is that it failed the sniffer test as well, here are my results:
15mph FAIL
RPM 1833
CO2 14.7
O2 0.1
HC 46 MEAS 61 MAX
CO 0.20 MEAS 0.54 MAX
NO 816 MEAS 467 MAX

25mph PASS
RPM 1759
CO2 14.7
O2 0.1
HC 31 MEAS 45 MAX
CO 0.15 MEAS 0.53 MAX
NO 751 MEAS 754 MAX

So far, I have checked for vacuum leaks and I found none, I also checked my pcv valve and it was not clogged, however I did notice that I just barely had it twisted into the hole, so it could have been sucking air from the environment rather than the actual crankcase. I checked the EGR for function by unhooking the line going from the egr regulator and attaching it directly to the egr valve, at which point the idle became extremely rough and the motor died, as it should. I noticed that with the egr regulator hooked up correctly I could not seem to get any vacuum on the line that goes from the regulator to the top of the egr valve, even when I revved the motor above 2,000 RPMs, does this indicate that I have a faulty egr dpfe or vacuum solenoid? I used generic O2 sensors from ebay that I had to splice in, could this be my problem?

Also the engine has less than 25 miles so I don't know it that could be part of my problem. I didn't heat my cat up by driving on the freeway like I normally do right before smog, but my car was up to operating temp.

Any help with this issue would be greatly appreciated! I really need to get this thing back on the road and I would hate to have to shell out the money for a "hot smog" when my car is completely stock and passes the smog test in every other aspect.


CaliFucos is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 03-07-2012, 09:04 PM   #2
MOAR BEWST!!!!
 
svtf1417's Avatar
 
Join Date: Aug 2008
Fan#: 58428
Location: Warren, MI
What I Drive: 2001 ZTS, 2002 SVTF Turbocharged

Posts: 1,528
Points 6,866, Level 54
Points: 6,866, Level: 54 Points: 6,866, Level: 54 Points: 6,866, Level: 54
Level Up 58% Completed
Level up: 58% Level up: 58% Level up: 58%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 6 svtf1417 Good Standing Member
Buy-Sell-Trade Rating: (6)
I could have sworn I learned in class that the EGR system is what helps reduce NOx, oxides of nitrogen, in emissions.
__________________
[#1417] 2002 Sonic Blue SVT Focus
Born on June 25, 2002

2001 Silver ZTS Sedan - "Ol' Reliable"
svtf1417 is offline  
    Reply With Quote Quick reply to this message
Old 04-02-2012, 04:34 PM   #3
Focus Jr. Enthusiast
 
Join Date: May 2007
Fan#: 47140
Location: Outside of Chicago, IL
What I Drive: 2001, Red, LX

Posts: 33
Points 90, Level 1
Points: 90, Level: 1 Points: 90, Level: 1 Points: 90, Level: 1
Level Up 80% Completed
Level up: 80% Level up: 80% Level up: 80%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 SPI Tuner Good Standing Member
Buy-Sell-Trade Rating: (0)
NOX is because you car is getting to hot. The EGR system puts burned gases back in to the cylinder to reduce NOX emissions. So yes you are right. Since I'm guessing you live in Cali the emissions standards take that into consideration. So yeah check you EGR flow with a vacuum pump on the EGR test port. If you surpass 4.2 in/hg of vacuum and the engine doesn't start to idle rough then that is your problem.
SPI Tuner is offline  
    Reply With Quote Quick reply to this message
Old 03-20-2015, 04:34 PM   #4
Focus Rookie
 
Join Date: Nov 2012
Fan#: 105707
Location: denver, United States
What I Drive: 2001 red zx3

Posts: 21
Points 352, Level 7
Points: 352, Level: 7 Points: 352, Level: 7 Points: 352, Level: 7
Level Up 4% Completed
Level up: 4% Level up: 4% Level up: 4%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 1 herenow Good Standing Member
Buy-Sell-Trade Rating: (0)
Curious on what the resolution was with the NOx emissions issue?
herenow is offline  
    Reply With Quote Quick reply to this message
Old 03-20-2015, 06:36 PM   #5
Hammer Down
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 23,688
Points 16,489, Level 82
Points: 16,489, Level: 82 Points: 16,489, Level: 82 Points: 16,489, Level: 82
Level Up 28% Completed
Level up: 28% Level up: 28% Level up: 28%
Forum Activity 100%
Activity: 100% Activity: 100% Activity: 100%
FF Reputation: 92 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
O.P hasn't posted since 6/12, I imagine it was resolved with EGR system repair.
__________________
"Rubber Side Down"

S.R. #275
Focus Takeover #003 / Tarbo Fan #003
sailor is offline  
    Reply With Quote Quick reply to this message
Old 03-21-2015, 02:02 PM   #6
Focus Fanatic
 
Join Date: Mar 2012
Fan#: 96610
Location: Fort Worth, TX
What I Drive: 00 wagon, 02 sedan both zetec atx

Posts: 7,156
Points 4,146, Level 40
Points: 4,146, Level: 40 Points: 4,146, Level: 40 Points: 4,146, Level: 40
Level Up 98% Completed
Level up: 98% Level up: 98% Level up: 98%
Forum Activity 99%
Activity: 99% Activity: 99% Activity: 99%
FF Reputation: 34 amc49 Great Standing Member
Buy-Sell-Trade Rating: (0)
It can be either EGR system problems or the front or top half of the cat depending on how cat is mounted. The front section reduces any leftover NOx that the EGR does not treat. If car has a low cat then whacking it against something on the ground can easily shatter the matrix to fail NOx, grab exhaust there and shake it to listen for like broken glass, if so cat is dead. Muffler guy trick is to whack cat with a hammer and tell you the broken sound you hear is a bad cat, well, or course, he just fractured it. How they get cat repairs. EGR itself cools the A/F mix by dilution, the burn is not as hot then and NOx then drops, it forms at combustion temps of over 2500 degrees. Too high compression can make it form too, why all emission engines in the '70s lowered their compression ratios. The average grocery getter engine 10.0-10.5/1 dropped to like 8.5/1.
__________________
Originally Posted by amc49
I wouldn't hesitate to tear down the absolute latest in automotive technology to immediately understand half of it instantly and the other half in less than a half hour. ..LOL, that's me all right!
amc49 is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
What I Drive
Year, color, and model of your car. Example: 2003 Pitch Black ZX3
Name
Your real name.
City
State
Country
Insurance
Please select your insurance company (Optional)

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:42 PM.


Copyright 2002-2015 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Mazda CX-3, Audi S3, Mazda MX-5 Miata and Acura TLX. You can find all Ford Focus, Focus ST and Focus RS related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. If you own other makes have a look at Challenger Hellcat Forum, Charger Hellcat Forum, Cadillac ATS-V Forum, Cadillac ATS Forum, Cadillac CTS-V Forum, Lexus RC-F Forum, Lexus GS-F Forum, Mercedes GLA Forum, Mercedes GLE Forum, Civic Type-R Forum and Volvo XC90 Forum.





Search Engine Optimization by vBSEO 3.6.1