Scott's build of a 1981 CJ8 Scrambler

Ok, need some help. Did some more troubleshooting tonight. The carburetor has an adjustment screw to change the amount of gas coming in. Protocol calls to tighten the screw all the way, then back it out two full turns. Turn on the Jeep and then tighten the screw back down until it starts to stall, then back off till it runs smooth.

Here is the weird part. The Scrambler won't even start unless the screw is all the way tight. It barely idles even then and as soon as I back off the screw to give it more gas, it starts stalling out.

Does that make sense?

Also note, I took the top off the carb to give it unrestricted air. So should have plenty of air going in yeah?

IMG_20170811_195425.jpg

Here is the little flathead screw I'm adjusting
IMG_20170811_195851.jpg

Sent from my Pixel using WAYALIFE mobile app
 
GraniteCrystal said:
Ok, need some help. Did some more troubleshooting tonight. The carburetor has an adjustment screw to change the amount of gas coming in. Protocol calls to tighten the screw all the way, then back it out two full turns. Turn on the Jeep and then tighten the screw back down until it starts to stall, then back off till it runs smooth.

Here is the weird part. The Scrambler won't even start unless the screw is all the way tight. It barely idles even then and as soon as I back off the screw to give it more gas, it starts stalling out.

Does that make sense?

Also note, I took the top off the carb to give it unrestricted air. So should have plenty of air going in yeah?

View attachment 272311

Here is the little flathead screw I'm adjusting
View attachment 272312

Sent from my Pixel using WAYALIFE mobile app
Click to expand...

Sounds like maybe it's flooded. When you try to start it, press the accelerator pedal all the way to the floor. That will open the butterflies and let max air in.
 
fiend said:
Sounds like maybe it's flooded. When you try to start it, press the accelerator pedal all the way to the floor. That will open the butterflies and let max air in.
Click to expand...
Yeah, even when I first bought it I had to pump the gas a few times to get it started. Would that point to a flooding situation too? Tips on next steps?
 
You put the pedal to the floor when starting not for the gas but for the air. Your rich condition means too much gas and not enough air.

You have a carb rebuild kit coming. Do that and get a clean air filter and see if things improve.

Also pull he plugs and post some pictures of them so we can help diagnose.

You'll get there.
 
Carburetor rebuild kit and radiator shroud came in today. Unfortunately I'm slammed with work and been up till midnight working the past week. Don't have any time to install them or the soft top yet.

IMG_20170816_102243.jpg

IMG_20170816_102420.jpg

So many parts, so little time!
IMG_20170816_102451.jpg
 
Was up till 4am last night rebuilding the carburetor. It looks great. It still doesn't start. Even since I tried tuning it, it won't start. I think I'm headed in the right direction though and hope it'll run smoother by the time I finish.

Before
IMG_20170817_194841.jpg

After
IMG_20170818_140124.jpg

Some more pics along the way
IMG_20170817_212548.jpg

IMG_20170817_223920.jpg
IMG_20170817_224657.jpg

IMG_20170817_233556.jpg
 
Have you checked actual fuel pressure yet with a mechanical gauge? I don't know what spec is, but that may give you an idea. They make them that you can put in line and just leave them there even.
 
WJCO said:
Have you checked actual fuel pressure yet with a mechanical gauge? I don't know what spec is, but that may give you an idea. They make them that you can put in line and just leave them there even.
Click to expand...
The one time I disconnected the fuel from the carburetor, started the Jeep for about 1-2s and there was this much fuel in the bag. Seems like it's getting plenty of fuel right? I meant to check the internal fuel filter on the carb last night and forgot.

IMG_20170726_103947.jpg
 
GraniteCrystal said:
The one time I disconnected the fuel from the carburetor, started the Jeep for about 1-2s and there was this much fuel in the bag. Seems like it's getting plenty of fuel right? I meant to check the internal fuel filter on the carb last night and forgot.
Click to expand...

If you remove the air filter and crank the engine, you should be able to visibly see if fuel is getting into the engine. Looking at the bag, it looks sufficient. As suggested above, you may want to pull a spark plug or two just to make sure it's not flooded.
 
fiend said:
Air filter still looks really dirty. Maybe it's just the photo.

If you have an electric choke, make sure it is operating properly.
Click to expand...

Agreed, looks dirty.

Scott, have you tried running it with the air filter completely removed? That may tell you a lot if it starts.

EDIT: Just saw your post above.
 
You must log in or register to reply here.
Top Bottom