amc 360+ eliminating emission stuff

[tommy123]

alright im rebuilding my 2150 carb and while im at it i feel like plugging off some of the polution control stuff. the cat is already gone, the oxygen pump is toast and the exhaust mantifold, where the emission stuff hooks up is busted. so i plugged the busted mantifold and now i want to get rid of the stuff i dont need. i know to keep the egr valve and the part for the choke, which i need to fix. but after that im clueless, so anybody want to fill me in.

[Richomino]

Hey there!

I got rid of my vacuum stuff (Running propane) a few months ago......I removed the two CTOs in the front of the engine (Theromostat housing and front-passenger side of manifold) and installed some plugs from summit....that also got me rid of a ton of vacuum hoses....

[DanHS]

I suggest the diagram in my sig. Only instead of running the spark cto, just connect the vacuum advance hose to manifold vacuum, and skip the ported vacuum. Then adjust the vacuum advance to start moving at about 7inches, then tune it to give you advance at the lowest vacuum you can without it pinging under acceleration.

[jamsni]

alright im rebuilding my 2150 carb and while im at it i feel like plugging off some of the polution control stuff. the cat is already gone, the oxygen pump is toast and the exhaust mantifold, where the emission stuff hooks up is busted. so i plugged the busted mantifold and now i want to get rid of the stuff i dont need. i know to keep the egr valve and the part for the choke, which i need to fix. but after that im clueless, so anybody want to fill me in.

What year is your Jeep?

[tommy123]

my jeep is a 1985

[Madduck]

i'll be moving to phoenix here hopefully soon. i know phx doesn't have any sort of emissions testing, does anywhere else in az? i.e.payson? may be moving up there. if no, would cutting out a lot of the pollution stuff help with fuel milage? the truck is an '86 gw that was originally a ca. vehicle so i don't know if back then there were special ca. emissions requirements?

or is it better to keep the emissions stuff and have it all running properly? was the engine designed to be more efficient with the emissions stuff?

thx

[joe]

i'll be moving to phoenix here hopefully soon. i know phx doesn't have any sort of emissions testing,

Are you sure about that?

[3jeepsdeep]

thankfully, there isn't that much pollution control stuff on the v8s -- at least, not as compared to the 258 I-6.

Air pump/injection manifold and EGR / associated temp switches are the main things ((at least on 1983/ earlier Cherokee & Wag V8s-- might not be accurate for 85))-- sounds like you already have addressed them in some manner.

The vacuum on the choke module helps the choke respond ((close)) when the engine heats up, based on intake manifold temp., I would leave it in place. If the EGR has been disabled, then the vacuum source to the temperature switches (CTUs) can be capped.

The vacum tube to the air cleaner snout should be left in place and remain functional. THis helps pre-heat the carb. in cold weather to prevent carb icing and allows fresh air intake in warm weather.

I would also keep the vacuum source to the fuel tank vapor cannister -- this does not have an appreciable effect on performance and will help prevent fuel vapors from escaping ((into your garage)).

FYI --
I have added aftermarket High Energy ignition systems to my jeep V8s ((Davis Unified Ignition)) for a reasonable price, that greatly increased power. On one, I also went with hedders, again increasing power, with a noticeable sacrifice in fuel economy.

hope this helps

regards
df (siq-jeep-man)

[MikeinColorado]

I replaced my intake mani gasket as I had a vacuum leak from it...
confirmed by my spraying carb cleaner on the bolts and getting a surge in rpm...
I cleaned up my emissions system, 86 ing most of it.
I have yet to adjust timing or carb. But I am still bogging down like I did when I had the vacuum leak. I have a noticable amount of power increase.. but she has hard starts when cold and dies from time to time when cold... and bogs down a bit here and there.
Had to restart a few time on my test drive unless I feathered the throttle.. suggestions?

[Tigger4X]

i'll be moving to phoenix here hopefully soon. i know phx doesn't have any sort of emissions testing, does anywhere else in az? i.e.payson? may be moving up there. if no, would cutting out a lot of the pollution stuff help with fuel milage? the truck is an '86 gw that was originally a ca. vehicle so i don't know if back then there were special ca. emissions requirements?

or is it better to keep the emissions stuff and have it all running properly? was the engine designed to be more efficient with the emissions stuff?

thx

Phoenix is in Maricopa County and you bet the smog nazis will gitcha! I lived in Apache Junction and even though it's in Pinal County I still had to go thru smog. You might be OK in Payson, Flagg, Sedona, and the like but dont count on it. As far as CA goes ... there are 49 state cars and then there are CA compliant cars. CA smog nazis make the others seem like childs play most often.

If you remove anything remove EVERYTHING associated with the system AND keep it! If you just plug up the AIR system and reroute the vacuum stuff your cats WILL plug up for sure and your performance will fall on its face.

[va4wd]

Mike in Colorado, the answer is your choke plate is not closing properly. Start it while cold and watch it. Adjust it to be sure it remains closed or partially closed while he engine is still cold!!

[3rdelement]

so if i have an 85 is this a good layout to follow if i want to keep my emission stuff? the PO made a huge mess of the vac lines on the top of the manifold. and im trying to find something i can follow as a map.

[MikeinColorado]

Mike in Colorado, the answer is your choke plate is not closing properly. Start it while cold and watch it. Adjust it to be sure it remains closed or partially closed while he engine is still cold!!

It was closing on it's own as the jeep cooled last night. is there a spec for it fully closed that I can measure with a feeler gauge?

[MikeinColorado]

I got mine dialed in...
Here was the laundry list of troubles...
1 timing was severely retarded....
2 vacuum leak on intake mani
3 vacuum leak on carb over by the choke
4. vacuum advance was not functioning properly
5. carb needed major adjustment.

I utilized a timing light, vacuum gauge, and a solid state analyzer for rpm to tune her in perfect....
she runs like butter now and I can drive it cold, floor it and no bogging.

[Tigger4X]

niiiiiiice congrats!