Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > Need some serious SMOG help.

Join Wrangler Forum Today


Thread: Need some serious SMOG help. Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

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.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
12-22-2013 04:18 PM
2xs
Quote:
Originally Posted by TheDesertOutlaw View Post
Try lightening the load on your Jeep the next time you take it in. Replace rear tires with small 27" street tires. Fill tank with Chevron or 76 gas. Make sure the Jeep is warmed up before taking it in - run it on the fwy 10 miles or so).
I believe his issue is NOx, cause from HEAT, test it cold....

Its cheating but can work...
12-22-2013 04:12 PM
redneckbrat
Quote:
Originally Posted by Nubby55 View Post
Ha, Man, move out of California. to the Government There!
if the wifes job wasn't as good as it is, we'd be gone.
12-22-2013 02:54 PM
TheDesertOutlaw Try lightening the load on your Jeep the next time you take it in. Replace rear tires with small 27" street tires. Fill tank with Chevron or 76 gas. Make sure the Jeep is warmed up before taking it in - run it on the fwy 10 miles or so).
12-22-2013 02:33 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
Just a thought since I haven't done anything for a while. Would a 32 inch tire make much difference over a stock (29 inch) tire?
Larger tires will "increase the load", lowering the RPMs required to stay at 15 and 25 MPH.

SMALLER tires increase the RPMs simulating less load via higher RPMs.

You would do better with space saver wheels, but good luck finding 4 with your lug pattern, and I would hate to drive like that...

Would be nice to see what he has done, it has been a while...
12-22-2013 01:53 PM
Nubby55 Ha, Man, move out of California. to the Government There!
12-21-2013 08:23 PM
redneckbrat Just a thought since I haven't done anything for a while. Would a 32 inch tire make much difference over a stock (29 inch) tire?
11-16-2013 09:27 PM
2xs OK, Looking over everything again, Lambda readings, CO2, and other stuff, I want to see if there is a way we can run this a tad rich...

Since the Cat is working great, Im SURE it can handle it, and the + lambda, combined with CO2 over 14.7% both say you are running a tad lean anyways.

So, HOW do we trick the computer into thinking we are lean, to get the computer to run fatter.
Without doing anything illegal.

1) is your O2 sensor biased a tad rich, sending a slight rich signal to the computer making the computer pull a small amount of fuel, so if this is the case, we compensate with a NEW (NOT BOSCH) O2 sensor.

2) Coolant temp sensor, does it match the actual coolant temperature?
A HIGh coolant temp causes the computer to lean out the mixture, a LOWER coolant temp causes the computer to ADD fuel, we compensate by replacing the CTS. OR replacing the wire with excessive resistance.

3) Fuel Pressure, if its low, and the computer cant compensate, you will run lean, replacing the fuel pump OR a defective fuel pressure regulator can rectify this.
Also make sure the FPR vacuum is hooked to MANIFOLD VACUUM, if its hooked to ported, it will pull pressure when its supposed to add it...

4) Plugged fuel filter

There is more, but im too tired to think about it right now.
11-16-2013 06:45 PM
redneckbrat
Quote:
Originally Posted by 2xs View Post

I am eagerly awaiting your good news!
They didnt make me pay this time. Nox was 1232, 5 less than last time
11-16-2013 06:23 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
Going in again today. I'll let y'all know what happens. I was looking at my valve cover, found some loose bolts, tighten them, maybe I wont leak anymore oil.
I am eagerly awaiting your good news!
11-16-2013 03:15 PM
redneckbrat Going in again today. I'll let y'all know what happens. I was looking at my valve cover, found some loose bolts, tighten them, maybe I wont leak anymore oil.
11-13-2013 08:10 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
I think we figured out the internal heat issue, was way low on coolant. Seems i have a leak. Changed the heater hoses, will change the upper rad hose friday
I use a machine that sucks the cooling system down to a vacuum, then sucks in the coolant, this makes sure there are NO air pockets and NO leaks.......

Like this:

Airlift
11-13-2013 01:19 PM
redneckbrat I think we figured out the internal heat issue, was way low on coolant. Seems i have a leak. Changed the heater hoses, will change the upper rad hose friday
11-02-2013 01:55 AM
redneckbrat I'll check in the am what plugs I'm running
11-01-2013 10:44 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
I have not check the freeze plugs, I don't remember seeing them check those either.
I didn't qualify for the CAP program from BAR. I am pretty sure we got all the cracks. It was removed to do all the welding. I've been taking it to smog 'n go, they are closest, not sure they will do a cold test. This last time they ran a couple big fans to help cool it down. I've not changed the tstat, I can only guess that it is correct. I spoke with the tech for about 15 mins after the test, he spoke mostly of excessive internal heat. I have no idea where the freeze plugs are.
Excessive internal heat, could be caused by over heat rated spark plugs, Cooling system restrictions, and Carbon on the pistons holding heat and upping compression and also causing detonation (Seafoam targets this when you run it through a vacuum line as you already did)..
11-01-2013 10:10 PM
redneckbrat I have not check the freeze plugs, I don't remember seeing them check those either.
I didn't qualify for the CAP program from BAR. I am pretty sure we got all the cracks. It was removed to do all the welding. I've been taking it to smog 'n go, they are closest, not sure they will do a cold test. This last time they ran a couple big fans to help cool it down. I've not changed the tstat, I can only guess that it is correct. I spoke with the tech for about 15 mins after the test, he spoke mostly of excessive internal heat. I have no idea where the freeze plugs are.
11-01-2013 09:24 PM
2xs Lets see, Using the Lambda calculator:

Free Automotive Calculators

1.003 15MPH test 1
1.004 25mph test 1

0.9999 15 MPH test 2
1.003 25 MPH test 2

0.990 to 0.980 is within an acceptable range of 0.98 to 1.02
1.0 perfect for emission and CAT operation (1.005 to 0.995 good for CAT operation)


We know we are in fuel control, the computer is working and doing its job well, but we still have a high NOx issue, so if I was working on your Jeep, the next thing I would do is run a ASM (Dyno) emissions test, in 5 gas ASM mode, and sniff BEFORE the cat.
Why before the cat? the NOx reduction portion of the cat is in front of the TWC, if there is excessive O2 before it will severely reduce the NOx reduction, this gets hidden by the OC reduction portion of the cat using the extra O2 to burn up excess HC and CO, testing before the cat makes this visible.
Basically, our lambda readings are great, but they include what the CAT is burning.
Are you SURE you got all the exhaust leaks?
If so, there could also be a hot spot in the cooling system, If a tech couldnt get a freeze plug out, and pushed it in and put a new one over it, it can cause high NOx from that area, coolant cant flow past the old freeze plug easily, and that spot gets hotter.

Excessive HEAT causes NOx.

You have already run Seafoam, welded cracks in the exhaust.

Are you running stock temp rating/style spark plugs? Hotter ratings can cause NOx issues....

Check your freeze plugs, if any are new, there is a suspect area.
Do you have a stock temp tstat? I know they run those HOT, and that is normal. A cooler Tstat might help a smigon, but i have never seen big results from this.

Maybe take it in COLD, see if you can get him run a cold test.
I seen this work on a V6 Catera, its not legit, but it did make a difference (what fixed the Catera was a AIR pump divert valve, was diverting to exhaust all the time).
11-01-2013 08:17 PM
redneckbrat
Quote:
Originally Posted by 2xs View Post
That is the correct part, lets think about the next step.

but not now, its late, and im kinda drunk....
so, what's the next step?
10-26-2013 11:47 PM
redneckbrat LOL, no prob, I can't think about it right now anyway.
10-26-2013 11:16 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
the part number on my paperwork is 39005
That is the correct part, lets think about the next step.

but not now, its late, and im kinda drunk....
10-26-2013 11:05 PM
redneckbrat the part number on my paperwork is 39005
10-26-2013 07:00 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
the description on my receipt for the muffler and cat states this: Car sound California certified Pre OBDII Catalytic Converter (EO# D-193-85).
Is there a part number? The part number will give exact applications.

http://www.arb.ca.gov/msprog/aftermk...es/amquery.php

Yes, is says except for cats, but this works for non obd2 cats.

Quote:
EO: D-193-85 View PDFEO Date: 2008-12-04Manufacturer Name: Car Sound Exhaust System, Inc. (d.b.a. Magnaflow)Device: Series 39000 non-OBD II TWCDevice Type: OBD II Catalytic ConverterPart_Number:Model_Specification:Modification_Allowed:Remarks:Series 39000 1995 and older model year pre-OBD II category T-1 trucks None Contact manufacturer or distributor for specific vehicle application
http://arb.ca.gov/msprog/aftermkt/de...o/D-193-85.pdf


AND finally:

http://www.magnaflow.com/02catalytic...&splityear=PRE

Just need that part number...
10-26-2013 06:06 PM
redneckbrat the description on my receipt for the muffler and cat states this: Car sound California certified Pre OBDII Catalytic Converter (EO# D-193-85).
10-26-2013 06:01 PM
redneckbrat ok, thanks. hope I can see it. I had the muffler shop put the cat and muffler as high as they could.
10-26-2013 03:31 PM
2xs You can also explain all this to that smog tech, ask him to verify it.

Also, look for the AIR tube inlet into the center of the cat, it might be capped
10-26-2013 03:28 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
It was replaced a week ago along with the muffler. How can i tell if they put the wrong one in?
Use the CARB number:

D-xxx-xx

GET THE PART NUMBER TOO
Its right below the D number

And post that number
Database: Aftermarket Parts Database of Executive Orders
10-26-2013 03:20 PM
redneckbrat
Quote:
Originally Posted by 2xs View Post
Has your CAT ever been replaced?
It was replaced a week ago along with the muffler. How can i tell if they put the wrong one in?
10-26-2013 03:15 PM
2xs Has your CAT ever been replaced?
If it has perhaps they put a '90 instead of a '91 cat accidently (or due to stupidity).

Not common, but I have seen it.
The '90 carbed 4.2 uses an OC+TWC and relies on an EGR to reduce NOx, it has a smaller NOx reduction front half because it relies on that EGR to reduce the majority of the NOx.


http://www.walkerexhaust.com/support...ytic-converter
10-26-2013 01:33 PM
redneckbrat Here it is. It was about 1qt low. I can see that it would make a difference, but not enough to pass.
10-25-2013 11:45 PM
2xs
Quote:
Originally Posted by redneckbrat View Post
ok, been a while since I updated. the welding went really well. got all the crac Curious, if it's low on oil, will that make it run hotter?
Yes, less oil allows more friction.

But, How low?

Post your new test results please.
10-25-2013 11:24 PM
redneckbrat ok, been a while since I updated. the welding went really well. got all the cracks filled. smogged it last saturday and still failed, but it dame down. I'm going to do sea foam again with what little I have left. Curious, if it's low on oil, will that make it run hotter?
This thread has more than 30 replies. Click here to review the whole thread.

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


All times are GMT -5. The time now is 01:26 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC