1985 Jeep CJ7 - Air Pulse reconnect - JeepForum.com
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post #1 of 20 Old 06-27-2017, 05:32 PM Thread Starter
dkr92886
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1985 Jeep CJ7 - Air Pulse reconnect

I recently bought the Jeep and need to get it smogged here in California.
I've ordered all the parts that are missing and should have them soon.
My question is what is the best way to connect the Downstream tube to the Catalytic Converter and the Upstream tube to the exhaust pipe? Do they need to be welded on or is there another way?

Thanks in advance for your help.

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post #2 of 20 Old 06-27-2017, 08:07 PM
CJ65
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I just had a cat put on. I will post some pics.


"Everything is easy once you know how to do it."
Dad circa 1970 something.



Chris
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post #3 of 20 Old 06-28-2017, 10:31 PM
CJ65
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My smog guy welded that up. He welds better than me, which doesn't say much about his welding. .

"Everything is easy once you know how to do it."
Dad circa 1970 something.



Chris
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post #4 of 20 Old 08-14-2017, 02:54 PM Thread Starter
dkr92886
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Finally was able to find and install all the missing pieces to help smog and register my 1985 CJ7.
I went for my first smog test and failed.
The fuel evap test failed and we were able to determine that the leak is at the sending unit. It's an MTS tank purchased from Quadratec and they are sending out a new tank and sending unit this week. Hopefully this one tests better.

these were the emission test results that failed ---
first reading is at 15 mph and the second one is 25mph

HC (PPM)
MAX MEAS
92 134
72 55

CO (%)
MAX MEAS
.61 1.79
.77 0.04

NO (PPM)
MAX MEAS
1085 1110
1120 1129


If you have any recommendations they would be greatly appreciated.
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post #5 of 20 Old 08-14-2017, 03:04 PM
LumpyGrits
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Cj

Either 'rich' or the 'cat' is dead.
Is the stepper motor work'n?
First, make sure you pass the visual test/inspection, showing that all the SMOG crap they want to see is there.
PRK is do'n it's best to get carb'd vehicles off the streets.
LG

Have'n you along, is like loose'n 2 good men
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post #6 of 20 Old 08-14-2017, 03:09 PM Thread Starter
dkr92886
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I did pass the visual inspection.
Will look at the carb and cat next. May just pull the trigger on a new cat, figure I've come this far.

D
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post #7 of 20 Old 08-14-2017, 03:20 PM
LumpyGrits
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'Cats' are big bucks-Don't just throw $$$ at it.
Rebuild the carb.
When I went to a MSD ign, it sure cleaned up my emissions.
When was the last time the dizzy cap, wires and plugs were replaced?
What about PCV valve?
You really should get a copy of the REAL factory shop manual, MR-252.
Good luck,
LG

Have'n you along, is like loose'n 2 good men
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post #8 of 20 Old 08-15-2017, 10:25 PM Thread Starter
dkr92886
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I will be replacing the PCV valves and grommets this week.
I have attached pictures of the distributor and a spark plug. Do you see anything that stands out? The Carter BBD carb was recently rebuilt and runs strong.
Attached Thumbnails
spark plug.jpg   Distributor.jpg  
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post #9 of 20 Old 08-16-2017, 06:59 AM
Matt1981CJ7
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Plug looks a little rich, but not awful.

As Lumpy mentioned, an ignition upgrade may clean things up. Team Rush and MSD module, perhaps?

An A/F monitor would also help a bunch, if you are inclined to tune your own engine.

Matt


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post #10 of 20 Old 08-17-2017, 07:09 AM Thread Starter
dkr92886
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All good recommendations. Grommets and PCV valves have been replaced.
I've ordered new distributor cap, wires and plugs. New tank should be here Friday. The family mechanic will install the tank and run a smoke test to make sure there are no more leaks. I'll have him check to see if he can lean it out a bit.
The engine runs strong and smooth just doesn't pass smog. Will continue to tackle the issue.
Excuse my ignorance, but what is an A/F monitor.

D
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post #11 of 20 Old 08-17-2017, 07:16 AM
Matt1981CJ7
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A wideband A/F monitor reads the air/fuel ratio in the exhaust. IMO, it's a key tuning tool for any carb'd engine.

It requires an O2 bung and sensor, which your '85 should already have, if your exhaust system is original.

Matt
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post #12 of 20 Old 08-17-2017, 10:34 AM
LumpyGrits
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Get rid of that OEM horseshoe connector on the coil. Known contact issue causing weak spark. Go with a screw terminal coil.
Plugs do look a bit rich. I run std, Autolite 985 plugs
Hope you are NOT buying stuff from Crown or Omix-Alda. They are China JUNK.
Go to NAPA and get their 'Gold' line. Make sure the cap has brass contacts NOT alum.
Lots of good info here-
http://home.sprynet.com/~dale02/list.htm
Get that FSM ordered......

LG

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post #13 of 20 Old 08-17-2017, 10:39 AM
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Quote:
Originally Posted by Matt1981CJ7 View Post
A wideband A/F monitor reads the air/fuel ratio in the exhaust. IMO, it's a key tuning tool for any carb'd engine.

It requires an O2 bung and sensor, which your '85 should already have, if your exhaust system is original.

Matt
There is only 1, O2 sensor on the '85. It's located on the downpipe from the exhaust manifold.
A new sensor would have to be installed as we are not permitted to tap into the OEM sensor.
Just an FYI.....

LG

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post #14 of 20 Old 08-17-2017, 11:19 AM
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Quote:
Originally Posted by LumpyGrits View Post
There is only 1, O2 sensor on the '85. It's located on the downpipe from the exhaust manifold.
A new sensor would have to be installed as we are not permitted to tap into the OEM sensor.
Just an FYI.....LG
Ah, yes, I forgot we were talking about Commiefornia, here.

Either way, a O2 bung is easy to install, and a A/F monitor would certainly help the OP, if he's inclined to tune his own engine for emissions testing.

Matt


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post #15 of 20 Old 08-18-2017, 09:34 AM
JeepdaddyRC
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First pic does not show. How is the pulse air connection made at the catalytic converter and exhaust pipe? I haven't seen a CJ with those OEM emissions systems intact - either rusted away or removed. There must have been a flexible connector at the converter.
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