CA Smog - Stock, failing - test results - JeepForum.com
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post #1 of 21 Old 08-16-2019, 03:06 AM Thread Starter
CJ7Guy1
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CA Smog - Stock, failing - test results

Uggg, so, here's the raw data - going back almost a year fail, fail, fail.

Spark plugs next, I guess.

Every vacuum hose replaced (colorful, wait till you see that...)

New O2 sensor (Denso 234-1003)

New Cat - Megnaflow - matching Cal Smog numbers ($266 installed)

EGR both working and I've posted a video of it moving.

Carb pins moving like crazy.

Brand new Sol-Vac - snapped off that brass / hex end (talk about wanting to shoot yourself....)

Thoughts?


Attached Files
File Type: pdf Smog test results.pdf (44.7 KB, 12 views)
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post #2 of 21 Old 08-16-2019, 05:35 AM
jtec
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testing EGR flow -when you apply vacuum to EGR - the engine should stall run very rough - yes no?

Is jeep reaching ECT?
Good vacuum at MAP?
Vacuum leaks - use old school carb spray trick.
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 21 Old 08-16-2019, 05:15 PM
sanddrag
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Haven't heard of failing with a new cat. New cat did wonders for me. Have you checked the timing?
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post #4 of 21 Old 08-16-2019, 06:44 PM
43Duc
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When my cat started going bad, the smog guy told me to get the new cat a few months before I brought it in for the next smog test. He said the cat works better w/ some miles on it.

Also, you can also make a smoke machine to check for vacuum leaks. Search Youtube for videos on how to make one. Pretty simple. I failed at one point because the rollover checkvalve was leaking. I had to pay for a smoke test to figure that out. Had I known at the time how to make my own I would have.


That said, I beat the Cali smog by going w/ the Howell FI kit. Expensive, but worth it.

1982 Jeep Scrambler w/ MBZ OM617 POWERHOUSE!!!
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post #5 of 21 Old 08-16-2019, 08:39 PM
StoneTower
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+1 on the Howell Fuel Injection. Unless your Jeep is a 100% restoration, it will start, run and pass smog easier with a new injection system.

Quote:
Originally Posted by 43Duc View Post
When my cat started going bad, the smog guy told me to get the new cat a few months before I brought it in for the next smog test. He said the cat works better w/ some miles on it.

Also, you can also make a smoke machine to check for vacuum leaks. Search Youtube for videos on how to make one. Pretty simple. I failed at one point because the rollover checkvalve was leaking. I had to pay for a smoke test to figure that out. Had I known at the time how to make my own I would have.


That said, I beat the Cali smog by going w/ the Howell FI kit. Expensive, but worth it.
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post #6 of 21 Old 08-17-2019, 01:09 AM
sertshark
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Another vote for the Howell. Worth every single penny. Awesome upgrade.

Year/Model: '86 CJ7 - Engine: 258 I-6 - Lift: Pro Comp 4" - Tires: 33X12.5 - Nuttered - Team Rush'd - Howell TBI
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post #7 of 21 Old 08-17-2019, 08:51 AM
Dryseals
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Interesting, from looking at the readings you've had high HC reading for a while and along with them is high O2 readings which tells me that you are having incomplete combustion and it seems to occur in the lower RPMs consistantly. Not sure what distributor you are running, but I would be looking at the timing in low RPMs. Maybe not enough advancement at the lower RPMs.
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post #8 of 21 Old 08-17-2019, 12:32 PM
xpage
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Your failing at 15mph and not 25 mph, might be due to a bad O2 sensor. I had a brand new one that helped my NOx numbers but still failed me on one test. $400 later from a shop and it was a bad O2 sensor (even though it was new with ~75 miles on it). They also charged 3x the price for the sensor and an hour for labor, and $200 diagnositic fee for a total of $400, lol, like changing an O2 sensor takes more than 10 minutes.

I'd get a new O2 and try it.
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post #9 of 21 Old 08-18-2019, 06:34 PM
Dryseals
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And just for an FYI, you have a two stage converter so it wants to see far less oxygen, the more oxygen you have the less the cat can reduce Nox. Here is a good little article about what you should be looking at.
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post #10 of 21 Old 08-19-2019, 04:34 PM
LumpyGrits
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Cj

You're sure-you have the correct spark plugs? Hope you are running a paper air filter.
PRK tightened up the SMOG specs back in 2011.
Check for vacuum leaks. Those will raise you NOX readings.
LG

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post #11 of 21 Old 08-20-2019, 05:16 PM
dpuls
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If you plan on keeping your CJ7 just spend the cash and have a Howell TBI fuel injection setup installed. Someone else suggested this as a solution for a California CJ7 and I agree. I had similar issues passing smog on my stock 258 1986 CJ7 in socal. It's passed smog every year tested since installing fuel injection and as an added bonus, you get rid of tons of vacuum hose under the hood! My cat is 20+ years old and looks awful but the jeep still pass smog with no problem. Hope this helps.
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post #12 of 21 Old 08-20-2019, 05:57 PM Thread Starter
CJ7Guy1
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Quick update - Went back to check smog after new plugs, cap and rotor - failed.

On vehicle test of EGR failed - this time.

Off vehicle test (apply vacuum, no hold, no vacuum at all) EGR FAILED.

Ordered New Old Stock of Cal Emission EGR - $106 plus shipping. Should be here in another year or so....

The old one was a Omix - cheap, cheap, cheap. Tested it with a video showing the pettel moving around with a rev of the engine. So much for that test if the diaphragm in the EGR is dead...

As soon as it arrives, I'll plug it in and reply back.

Oh, and I have a guy that has a couple junk Jeeps (engines mostly) checking for a used EGR in the mean time.

~Patrick
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post #13 of 21 Old 08-20-2019, 06:39 PM
Hurricane4
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Summit Racing lists two EGR Valve part numbers for your '84 CJ7 258 6 cyl:

https://www.summitracing.com/

Standard Motor Products EGV524 - Standard Motor EGR Valves
EGR Valve, Replacement, Jeep, 4.2L, Each
Part Number: SMP-EGV524
Estimated Ship Date: Today
$63.99

Standard Motor Products EGV687
EGR Valve, AMC, Jeep, 4.2L, Each
Part Number: SMP-EGV687
Estimated Ship Date: 8/22/2019
$69.99

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post #14 of 21 Old 08-20-2019, 06:47 PM
LumpyGrits
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Cj

Quote:
Originally Posted by dpuls View Post
If you plan on keeping your CJ7 just spend the cash and have a Howell TBI fuel injection setup installed. Someone else suggested this as a solution for a California CJ7 and I agree. I had similar issues passing smog on my stock 258 1986 CJ7 in socal. It's passed smog every year tested since installing fuel injection and as an added bonus, you get rid of tons of vacuum hose under the hood! My cat is 20+ years old and looks awful but the jeep still pass smog with no problem. Hope this helps.
Really---
My Jeep is all stock, except for the MSD ign.
Still passes Ca. SMOG.
FWIW: The MSD did much to lower emissions.
LG

Have'n you along, is like loose'n 2 good men
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post #15 of 21 Old 08-20-2019, 06:50 PM
LumpyGrits
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Cj

Quote:
Originally Posted by CJ7Guy1 View Post
Quick update - Went back to check smog after new plugs, cap and rotor - failed.

On vehicle test of EGR failed - this time.

Off vehicle test (apply vacuum, no hold, no vacuum at all) EGR FAILED.

Ordered New Old Stock of Cal Emission EGR - $106 plus shipping. Should be here in another year or so....

The old one was a Omix - cheap, cheap, cheap. Tested it with a video showing the pettel moving around with a rev of the engine. So much for that test if the diaphragm in the EGR is dead...

As soon as it arrives, I'll plug it in and reply back.

Oh, and I have a guy that has a couple junk Jeeps (engines mostly) checking for a used EGR in the mean time.

~Patrick
Call these guys--
https://www.willysworks.com/

LG

Have'n you along, is like loose'n 2 good men
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