CJ 5 F head 134 loses power. . .

Hello all- I am new this site and am a avid jeep guy. I have a project like all of us.... here is the deal... Over the last year and a half I have done a complete frame off restoration on a 58' CJ5 with my brother in law, all Original 134F head, New seals gaskets, paint, wiring, lights, colored spray on bed liner, seats, all most everything has been rebuilt/ replaced less the head, and points style distrbutor. The heads were supposedly rebuilt by previous owner and while I was going through the bottom end off the engine all looked very good .

the Jeep starts right up, runs fine, drives fine and looks great, but it has no power in third gear and backfires between 2nd and third.......I am running 1/2 a PSI on my fuel reg. and Electic fuel pump

I am brain storming to create a trouble shooting list, I need to
- check firing order
- check timing
- Pump up fuel pressure to 1.5 to 2.5
- Check exhaust leaks
- Check replace points ?
- Check distributor / replace . - I am not sure how to go about checking the distributor and thoughts here

Thinking about this it seems that I have a fuel or spark problem why it is only at third gear maybe the coil is suspect too?...


Any insight wound be appreciated.

 

I will try these and report back. My Jeep is out a inlaws, they have property and a shop. It is an hour plus drive out there and I don't get out there every weekend. I look foward to trying these and will get back shortly.. I hope the hoildays are coming. And this all I think about but having the time at this point in my life is the hard thing with 2 kids under 3 year old....

 

It could be valves or a worn camshaft. Does it seem to lose power at high RPMs?

 

Fuel pressure needs to be checked at the carb inlet, 1.3 .. 2 psi. but not more than 2. If your regulator is mounted low, 13" of vertical rise will null .5 psi.

Paul

 

My fuel pressure reg. is about on the same horizontal plane as my carb. but I was running it at 1/2 psi, No significant change in elevation. I haven't gotten a chance to bump that up.... and try it out. I think I'll start with 1.5 psi trial run.



my first attempt at attaching a picture.


It seems to loss power at higher RPMs but only in third gear and sometimes second gear, First gear has A good RPM range and no loss of power........

 

How about the condensor?

 

I got some time to trouble shoot this last weekend. I bumped up the fuel pressure regulator to 2 psi, after fighting a dead battery and gas overflowing out of the Carb.....? I got it started and it ran better, but third gear still had no guts and it shuttered in third a few times like it was going to die on me. ( same Problem as before) Then it died and wouldn't start on me but, it may have been just out of fuel.... oh, to own a jeep...

I am at loss now I don't know how to do much more trouble shooting without just throwing parts at it...... The fuel over flowing the carb. was a problem I have had before but, didn't mention it . It has a carter carb. Are the Solex carb any good? How would I check the timeing? I have read it is no easy on the F head.. Or how would I check out the condensor? Any insight would be helpfull.

 

Condensor.... just put in a new one, they're cheap, easy and quick. If problem stops, there ya go!

 

I see a potential problem in your fuel system. that steel line running from the carb to the regulator mounted to the fuel pump then to the fire wall. it will eventually crack or break due to engine vibration. timing is not any harder on the f head than any other engine. you just need a timing light, hook up the pickup lead to #1 plug wire, + to + on the batt and - to - on the batt, start it up point at the crank pulley and see where the notch in the pulley hits on the timing indicator. should be 5°. if its not move the dist untill it is. <note set point gap first, it will change timing>

 

valve adjustment will also cause you to loose power. sounds like timing, or a lean fuel mixture to me.

 

I had similar trouble when I had my electric fuel pump mounted as high as yours. Mounted it much lower and the trouble went away. I guess they need to push not pull fuel.

Ken

 

Is the accelerator pump working correct, i had a shop fail at a carb rebuild. ran but was not right, the pump linkage was missing causing it to fall on its face when shifting then would pick back up once in gear and would pull the choke 1/4" to get the mix right at speed.

 

fuel overflowing sounds like float needs adjusting. Carb rebuild time

 

R)

 

Why do you need a fuel pressure regulator and electric fuel pump? When I had my 64 CJ-6 with F-134, the stock fuel system worked perfectly and I never had any fuel related problems.

 

I had the same problem ...it was points spring had lost it temper and would bounce. Some one left the key on and it overheat .

 

I got rid of my Carter for a Solex and would not suggest it. The condenser is a 2 buck chuck so cheap and quick. If the condenser is bad sometimes you'll be able to pick it up off a timing light. If it skips...replace