Newb needs help with engine sputtering

I went ahead and changed the vacuum advance and fuel filter. After a full weekend of doing everything I can think of to do nothing has changed. Anyone want to buy a Jeep with a lot of new parts.

 

Try timing at 6 bdc. How did the compression come out? Did you check the dist for slop in the bearings? You may want to get a factory service manual and not the chiltons so much. Good luck.

 

I will try to advance the timing a little tomorrow. I have not checked the compression yet. The distibutor fells pretty tight, but not completely sure. The only things that I have not changed are the distributor cap and the rotor. I have also not checked the valves.

 

It is connected to the base of the carb.

 

I like to set the carb adjustment with a vaccum gauge. That will get it pretty dead on, so you can eliminate adjustment as a problem. Just adjust the two screws until you get the highest vaccum. You want the screws within a quarter turn of each other tho. And you may wanna leave it a tad on the rich side.

By the way, I get all my Fram fuel filters at walmart for dirt cheap. I prefer the clear platic ones so you can monitor the condition of your fuel/filter and also tell if there is water in the fuel.

 

:iagree: with both, you should not have any vacuum going to the advance @ idle, only @ higher rpms

 

Take a picture of the carb from the passenger side fender (with the air cleaner removed)showing where you are hooking up your vacuum. Looking from the passenger fender, it should be on the right side near the bottom of the carb.

The fuel filter is the same one that is used on the 70-71 225 in a jeepster. Your fuel lines have probably have been modified. Make sure that all of the fittings are tight and not sucking air. Check all the way back to the tank.

 

Well I took the jeep and dropped it off at a friend of mines shop. SO maybe I will have the answer tomorrow. He seems to think it is the carb, since it is running so rich and back firing.

 

Good luck at the shop. Hope he gets it fixed. Please let us know what he finds.

 

Well I hate that I couldn't find out the problem on my own, but I am stumped on this one. I have tried everything and I just can't figure it out on my own.

 

Sometimes it just takes another set of eyes and throwing in the towel is better than going crazy trying to solve a problem.

Regarding the anti-backfire valve. The Air Injection System would pump air into the exhaust flow at the manifold to burn off leftover fuel but under deceleration the super rich mixture would ignite and backfire. The solution was a valve to bypass the air until normal manifold vacuum was restored. Since your system was removed you don't need to worry about it.

 

I really have to read these post more often, I'm fighting the same problem with my motor.

 

Scott if you have a v6 does it have the original distributor or has it been changed?
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Well I have become some what of an expert in this field in the past week, so maybe I can help. Eventhough I couldn't fix mine sometimes it helps to have a second opinion.

 

Yes, the original point type distributor. Bought new two years ago. My problem has just occured. Was running great. Checked timing, dwell, and vacuum. All checked out. I did find a leak in the intake, between the intake and head. Fixed that, to no avail. Going to do a carb rebuild next.

My other thought. Maybe flat cam?

 

I'm having the same problem as you and Jcorlew sounds like, maybe not quite as bad. I've done everything stated but still has a little stumble. I'm not real sure or very experienced on distributors but I think mine may be worn or at least the mechanical advance springs may be worn. If you guys come up with anything please post, maybe its something obvious just being overlooked. Thanks. You know the old saying you can't see the forest for the trees.

 

So I went over to my buddies shop tonight to see if we could figure out what is the problem. After doing a compression check, and checking the vacuum lines we determined that everything checked out. While giving the motor a once over we discovered a problem by using a very advanced tool called spit. When spit was applied to the driver side header it smoked, but when applied to the passenger side nothing. The plug was igniting, but wasn't burning the fuel, so the header was not heating up. This is why I was getting a loud back fire out of the passenger side exhaust. The fuel was not being burned off, and when it reached the hot exhaust it was ignited. We adjusted the timing back and forth and went from 2 passenger side spark plugs burning to 3 plugs burning. We tightened down the hold down bolt and I took it for a ride. It was almost perfect just a little bit more adjusting and I think this problem might be solved. There was still a little back fire but it was not as much and the not near as loud. I did not check what the timing was set at when we got it right, but it was no where near 5 degrees which is whats recommended in the manual. We are going do some more fine tuning on it tomorrow so I will let you know how it goes. I am also changing the glass packs out for some turbos because the sound is just annoying.