1980 four cylinder CJ7 emission failure. - JeepForum.com
 
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post #1 of 14 Old 08-13-2020, 04:03 PM Thread Starter
CJ7 Mac
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1980 four cylinder CJ7 emission failure.

I purchased this CJ new and over the years it has a history of emission and other carb related problems. Although it runs smooth and sounds good, it finally caught up with me with a complete emission failure. I've been to two different "experts" and after six separate emission test failures I'm not sure what to do next. The target limit is 400ppm HC and 1.50% CO. Some times it might pass one and fail the other. Other times it would do just the opposite. Then it might pass both but fail due to the gas cap, even with a new cap. Expert #2, who is a veteran emission correction specialists, suggested that a carburetor rebuild might solve the issue but there would be no guarantee. He commented that with the idle adjustment completely closed the engine continued to run, suggesting and internal fuel leak,

I'm looking at a couple of options but I have some questions related to them.

1 - I am unable to find any info on the carb, regarding make or model, making it difficult to locate rebuild kits or remanufactured carbs. I have located a logo that I am unfamiliar with and a 12 digit number (17080685 1020). Where can I find the needed information?

2 - I noticed here on the forum that there is strong interest to convert to Webers but I've been unable to locate a Weber that is suitable for use with the 151 cubic inch GM Iron Duke engine. Has any one had experience with this conversion?

3 - A rebuilt or upgrade to a larger engine is a possibility but I would rather keep it as original as possible.

Any input would be appreciated.

Mac

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post #2 of 14 Old 08-13-2020, 04:17 PM
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Is this what you have?
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post #3 of 14 Old 08-13-2020, 04:32 PM
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The original carb. is likely worn at the throttle shaft. and the fuel cap failure could be a hose in the Evap. system a leaking hose here would be the same as a bad cap. is the Cat good?

Does the engine have good compression and leak down numbers? If so that carb was used on a range of GM AMC and Jeep vehicles so it is available to stay all stock. if the numbers are bad a rebuild
is in your future.

That said, the Weber 32/36 would work well on a 151 CID or 2.5L engine, you may have to make an adapter if none are available and it will not smog if you're in CA.

what state are you in?

Whats over that next ridge?
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post #4 of 14 Old 08-13-2020, 05:43 PM
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You have a rochester 2se carb. I converted to a weber 32/36 on my iron duke which provides a little more punch while getting slighty better mpg. The weber however is not plug and play as the provided adapter for the throttle cable will not work. I fabricated my own. There are still some 2se new old stock on ebay.

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post #5 of 14 Old 08-14-2020, 10:33 AM Thread Starter
CJ7 Mac
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Thank you guys for the quick, informative response. I am impressed.
Sorry for my delayed response - I had difficulty logging back on.
Yes, Orange - that is the carburetor.
4Low - I am in Colorado. Checking compression and leak down is on my to do list. Shouldda started with that. Expert #2 was concerned about the worn throttle shaft.
Momo - Thanks for the e-bay suggestion. They even have a NOS carbs for high altitude and I am at about 5,000 feet in elevation.
Again, Thank You all.
mac
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post #6 of 14 Old 08-14-2020, 12:20 PM
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Where are you?

-----jeepfeller
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post #7 of 14 Old 08-14-2020, 12:30 PM
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I Googled this

If the info is right

Why are you concerned?

----JEEPFELLER
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post #8 of 14 Old 08-14-2020, 12:45 PM
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Quote:
Originally Posted by JEEPFELLER View Post
I Googled this

If the info is right

Why are you concerned?

----JEEPFELLER
There's nothing there that exempts him. I live here as well, it does need tested in most counties.

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post #9 of 14 Old 08-14-2020, 01:02 PM
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Quote:
Originally Posted by Kruzin View Post
There's nothing there that exempts him. I live here as well, it does need tested in most counties.
Right,

Does Colorado do a visual and tail pipe on pre OBD2 vehicles?

When I lived in CA EVERYTHING had to stock and in place
in front of the Cat unless the part was CARB approved.

Also is there a cut off for inspection like CA does not inspect 1975 and
older vehicles?

Whats over that next ridge?
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post #10 of 14 Old 08-14-2020, 01:07 PM
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Yes, they do a visual and sniffer test on older vehicles. If it came with certain emissions equip (air pump, cat), it's supposed to still be there (or equivalent).
And as noted above, older then '75 with "collector" plates are exempt.

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post #11 of 14 Old 08-14-2020, 01:41 PM
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Problem with collector plates in CA is limited use, to and from shows, parades etc.
Here in Idaho there are use restrictions as well, but tags are cheap so no worries.

Idaho is by county, for inspection, Pretty easy going here, when I got the plates
I had a cop come to verify the vehicles, He didn't even check the VIN ## just looked at
my titles and filled out the slips.

Whats over that next ridge?
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post #12 of 14 Old 08-14-2020, 01:45 PM Thread Starter
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I'm in Golden CO.
I looked into the exemption opportunities and there are two.
One is hardship and proof is required such as low housing evidence, food stamps etc.
The other is "Cost to attain compliance". It's a something over $700.
Even checked out what it would take to license in counties outside of the Denver metro area where the emission rules apply.
A good bit of hassle!
Will most likely go with the NOS carburetor.
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post #13 of 14 Old 08-14-2020, 02:42 PM
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You could try National carburetor or Guaranteed carburetor to see how much for them to rebuild it would cost. I sent my 2100 to Guaranteed Carburetor since the throttle shaft had some play in it. I got it back in a week.
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post #14 of 14 Old 08-14-2020, 02:43 PM
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A nos one is only 200

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