258 not happy with the Holley.
FrankenJeep78
Jeeper
Not sure where I left off but I got the Jeep back together after rebuilding the carb and getting a new distributer module and a new coil.
The Jeep has never been happy with this carburetor but I just get different new problems every time I try something new. When I rebuilt it I found out what it was, a 4 barrel 4160 but I can’t seem to remember the CFM. Talking to a performance shop guy is how I figured everything out so I know he got me the right kit because I brought the carb in. Rebuilt it based off of a very in depth YouTube video but I wouldn’t be surprised if I made some sort of mistake somewhere. It was my first rebuild. I do remember the kit not having the correct jets so I used the next size up. I can get more details if I find where I hid the kit.
Trying to tune it was not normal, getting the best vacuum and running it on that would cause it to spit under load which I quickly fixed by richening it up. I haven’t rechecked it with the vacuum gauge but I tuned it to where it was half a turn richer than any spitting.
The electric choke is broken so I removed it. I had my first real cold weather start a couple days ago. Severe power loss, it would stall putting it in the granny gear and I even got it to spit again. It got better when it got up to temperature which is what I expected. I richened it up another turn on both sides and it’s been running pretty well but I still feel like somethings not right with the power output from where it was before I rebuilt it. I also tried forcing the choke plate closed to run it until it got up to temperature which worked as I expected with the power level. Just another pita to have to open the hood to manipulate the choke but it should be a winter only thing.
Now here’s the thing, I have no idea what my mpg is but I have a pretty good idea that it is bad.
Now here’s the real thing, at idle every several seconds there is a small pop which I think is weak exhaust backfire. No matter my setting, this has been going on since the rebuild. In my initial tuning I had some severe backfires but that’s gone. Under power every now and then I think I get a mild backfire that is audible over the Jeep running without a top on but it’s nothing too loud. Does any of this sound like it’s bad for my poor 258?
Some other info is that I have an electric pump with no recirculation/pressure regulator. However when I set the float level it worked normally. it’s not like the pump was forcing fuel in past what the carb wants. I can check the pressure when I find my gauge that should be with my carb rebuild kit. However my fuel line is definitely a fire waiting to happen based off of reading things here so that will get fixed.
Aside from all this, getting stranded because I used the wrong size electrical part in the ignition switch, and finding out the fuel gauge was grossly off being accurate, I have been a happy little CJ owner.
The Jeep has never been happy with this carburetor but I just get different new problems every time I try something new. When I rebuilt it I found out what it was, a 4 barrel 4160 but I can’t seem to remember the CFM. Talking to a performance shop guy is how I figured everything out so I know he got me the right kit because I brought the carb in. Rebuilt it based off of a very in depth YouTube video but I wouldn’t be surprised if I made some sort of mistake somewhere. It was my first rebuild. I do remember the kit not having the correct jets so I used the next size up. I can get more details if I find where I hid the kit.
Trying to tune it was not normal, getting the best vacuum and running it on that would cause it to spit under load which I quickly fixed by richening it up. I haven’t rechecked it with the vacuum gauge but I tuned it to where it was half a turn richer than any spitting.
The electric choke is broken so I removed it. I had my first real cold weather start a couple days ago. Severe power loss, it would stall putting it in the granny gear and I even got it to spit again. It got better when it got up to temperature which is what I expected. I richened it up another turn on both sides and it’s been running pretty well but I still feel like somethings not right with the power output from where it was before I rebuilt it. I also tried forcing the choke plate closed to run it until it got up to temperature which worked as I expected with the power level. Just another pita to have to open the hood to manipulate the choke but it should be a winter only thing.
Now here’s the thing, I have no idea what my mpg is but I have a pretty good idea that it is bad.
Now here’s the real thing, at idle every several seconds there is a small pop which I think is weak exhaust backfire. No matter my setting, this has been going on since the rebuild. In my initial tuning I had some severe backfires but that’s gone. Under power every now and then I think I get a mild backfire that is audible over the Jeep running without a top on but it’s nothing too loud. Does any of this sound like it’s bad for my poor 258?
Some other info is that I have an electric pump with no recirculation/pressure regulator. However when I set the float level it worked normally. it’s not like the pump was forcing fuel in past what the carb wants. I can check the pressure when I find my gauge that should be with my carb rebuild kit. However my fuel line is definitely a fire waiting to happen based off of reading things here so that will get fixed.
Aside from all this, getting stranded because I used the wrong size electrical part in the ignition switch, and finding out the fuel gauge was grossly off being accurate, I have been a happy little CJ owner.
