Odd Running Problem
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Odd Running Problem
- Thread starter jafo
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- Springfield, Missouri-U.S.A. Earth
- Vehicle(s)
- '85 CJ-7, 258/4.2L 6cyl. Bought new in 1985. Full cage, Warn 8274 winch, Ford 9" rear, front/rear Detroit Lockers w/4:88 R&P. T-5 tranny and 4:1 t'case. 33X12.50-15 BFG/AT, MSD ign, on board air---
NP-That's what makes this such a great forum. 
No prima donnas here.
LG
No prima donnas here.
LG
caver
Jeeper
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- murfreesboro tn
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- My only Jeep now is a 1978 stock CJ 5 I am Restoring. I think possibly a renegade because of inside dash lights and under hood lights. 232, 1 bl Holly, I think a T150 3 spd. , a 20 transfer and rear and a 30 front diff. Lotta work. Need Oil pressure gauge and Volt meter gauge. Repaired speedometer and volt meter but need to replace both to match. Electrical Harness or maybe columb switch? No power from panel to fused circuits? Ripp out rigged up wiring by non pro. Lotta work. Frame solid minor rust runs OK since I rebuilt Carb. Rebuilt heater box. Check all fluids and tried to use GP-4. Trash in fuel tank. Will restore as stock with White Wagon Wheel Rims 16"x10". My wife and kids cried when I parted with our Jeep in 1985. 250,000 miled on first engine and 30,000 on a 258 I installed from a Hornet? If I dont go bankrupt I wanna build my Sun Orange again.
Beware if it is a Carter 1 bar. YF YFA Float Level can act up and cause similiar problems. However the Empty Bowl is a dead give away if runs rich (black smoke and carbon fowled plugs NOT OIL FOULING but fuel.)
Verify Fuel is jetting into carb when the throttle is pressed. Even if it is Very few mechanics are aware of the Check Valve in the pump housing top cover. There will be a small hole into the cover and its output is into the pump cylinder and the diaphram. There is a metal Check Valve Ball inside this cover housing. A small piece of trash or worn seat can cause many of the problems I see expressed here. Since this cap must be removed from the pump housing cover to replace or repair the ball or seat it us often overlooked or not know to exist.
If you rebuild the carter YF / YFA dont overlook cleaning by blowing cab cleaner through this Valve. Should only allow fuel to be drawn in when the pump is throttled. Many unsuccessfully rebuilds of the YF YFA Carters are because of this valve. Kits dont mention this valve and is very common problem when a dry bowl, bad or rough Idle, hard starting after sitting, running rich and carb backfiring problems are found.
Hope this helps
Verify Fuel is jetting into carb when the throttle is pressed. Even if it is Very few mechanics are aware of the Check Valve in the pump housing top cover. There will be a small hole into the cover and its output is into the pump cylinder and the diaphram. There is a metal Check Valve Ball inside this cover housing. A small piece of trash or worn seat can cause many of the problems I see expressed here. Since this cap must be removed from the pump housing cover to replace or repair the ball or seat it us often overlooked or not know to exist.
If you rebuild the carter YF / YFA dont overlook cleaning by blowing cab cleaner through this Valve. Should only allow fuel to be drawn in when the pump is throttled. Many unsuccessfully rebuilds of the YF YFA Carters are because of this valve. Kits dont mention this valve and is very common problem when a dry bowl, bad or rough Idle, hard starting after sitting, running rich and carb backfiring problems are found.
Hope this helps
Last edited:
Fonchy
Jeeper
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- Sanford, NC, USA
- Vehicle(s)
- 1981 CJ7, 258, 5 speed, 38dges carb, Dana 20 and Dana 300
1980 CJ5, 258, 4 speed, 1bbl,
2020 gladiator rubicon
2018 Mustang GT
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- Frederick colorado
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- 84 cj7, 91 cherokee, 78 chevy 3500 pu, 78 CJ7
You have two outlets on the filter one to the carb and one to the return line to the tank. The return line should be at 12:00 and the one to the carb should be at 12:30.
Posi
Always Off-Roading Jeeper
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- 54 Willys 3B, FI 401, T-18, ARB Locked, Hinkey Sidewinder Winch
My 360,
Edit: mtnwhir, that's twice in one night.
Edit: mtnwhir, that's twice in one night.
Last edited:
Fonchy
Jeeper
- Posts
- 66
- Thanks
- 0
- Location
- Sanford, NC, USA
- Vehicle(s)
- 1981 CJ7, 258, 5 speed, 38dges carb, Dana 20 and Dana 300
1980 CJ5, 258, 4 speed, 1bbl,
2020 gladiator rubicon
2018 Mustang GT
So return towards the hood, I’m asking because my engine just shuts down and if I look at the tach is all the way to ZERO but I can start the Jeep with no problems, I was thinking a loose ground but is grounded pretty good. Thanks for the post
Posi
Always Off-Roading Jeeper
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- 54 Willys 3B, FI 401, T-18, ARB Locked, Hinkey Sidewinder Winch
You should start a new thread.
- Posts
- 11,552
- Media
- 57
- Thanks
- 11
- Location
- Frederick colorado
- Vehicle(s)
- 84 cj7, 91 cherokee, 78 chevy 3500 pu, 78 CJ7
Posi
Always Off-Roading Jeeper
- Posts
- 8,044
- Media
- 172
- Thanks
- 82
- Location
- New England
- Vehicle(s)
- 54 Willys 3B, FI 401, T-18, ARB Locked, Hinkey Sidewinder Winch
Quick you are :driving:I'm still pretty quick for a old fart
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