Expected co reading from L134 engine on M38

horse · Post by **horse** » Fri Jun 05, 2020 5:45 am

After working on the Timing Carb etc ,thought I might get a modern CO reading at a Test centre.

In the U.K. we do not have to test but I would be interested to know what a well set up Jeep would produce so I have a bench mark.

I have had a look through, but back in the day it was not a very important subject it would seem.

So looking for average CO and Hydrocarbon readings if possible.

Thanks

horse · Post by **horse** » Sat Jun 20, 2020 11:46 am

Nobody had an M38 on a meter then!

Anybody?

horse · Post by **horse** » Wed Jun 19, 2024 12:22 pm

It has been a while to get a reply on this.
So after setting up the engine after a leaking manifold gasket I wanted to get a CO reading to make sure she was not lean at the top end of the revs.
So with the Weber carburettor fitted I got 2.70% Vol which is an MOT pass in the U.K.and a clean running engine.
I know nobody is interested in Jeep emissions but nice to know.
Horse

Post by **wesk** » Wed Jun 19, 2024 12:45 pm

In the US most states require a passing score. Some exempt antique classics but you will have a hard time finding a jeep owner here in the US that wants the stae and federal government to know what his jeep's emmisions are!

horse · Post by **horse** » Thu Jun 20, 2024 3:38 am

Interesting, all vehicles over 40 years old are exempt from a test on this side of the pond.
They still have to be road worthy if you get stopped for speeding::lol:
Horse

4x4M38 · Post by **4x4M38** » Thu Jun 20, 2024 7:28 am

In Texas, it’s by high density areas. Austin, Dallas-Ft.Worth, Houston, etc.

Here in the country our county does not test.

whydahdvr · Post by **whydahdvr** » Thu Jun 20, 2024 9:13 am

In Massachusetts they never bother with any of my antique jeeps. Exempted. The direction is to go with what was on it originally, so limited emissions controls and other "modern benefits"...
On the other hand, most people with vehicles this old don't drive them all day, every day, in large numbers so the impacts are limited.

4x4M38 · Post by **4x4M38** » Thu Jun 20, 2024 2:25 pm

I mean, if they want to get anal, I guess they’d start with the draft tube on the civvy jobs?

Truly an anachronism. One of the first engines with a positive crankcase ventilation system.

RonD2 · Post by **RonD2** » Thu Jun 20, 2024 4:04 pm

No inspection of any kind here in South Carolina, new, old, or otherwise.
Plenty of laws on the books that any LEO can ticket you for (but they don't carry emission probes around with them) --- like busted tail lights and such.
It's the honor system at work.

According to google, 29 of 50 states have some kind of emission test, and most of them seem to exempt old vehicles.

I think when the government decides to get anal about something, they'll usually start with a cavity search.
According to the news, their objective is to get rid of all infernal combustion engines altogether.