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Have a 95 YJ with a 4.0 5speed. Slight cam, lifters, 62mm hesco throttle body, cold air intake, Full Banks exhaust. All new plugs wires, etc. Timng is jumping from 10 degrees to 35ish degrees at idle......... Timing chain is brand new. Checked marks and there lined up for correct timing. I...

has new accel plugs .035 gapped, wires, cap, rotor, fuel filter, timing chain, no rust at all or corrosion, new temp sensor. 62 mm hesco throttle body off and cleaned, LOST, LOST, LOST and frustrated! No Codes right now. there was map sensor and TPS codes but that was becuase the map sensor...

yes, it has hesitation under acceleration. It comes out of it sometimes ith all its power, then goes back into hesitation. I can put the pedal to the floor board and it doesnt go, then shift or let of the gas pedal and power will come back. If i hit high RPM it will cut out and back fire! WTF

I have a 95 yj 4.0. Been having issues I cannot figure out. Has 62mm hesco throttle body, spacer, cold air intake, New hesco adjustable fuel regulator, new plugs cap rotor, fuel filter, timing dead on at 14, no vacuum leaks. Jeep hesitates and then kicks in like nothings wrong under...

I have a 95 yj as well, mine has been back firing at high rpm and doing the same sputtering so to speak. Normal driving ok, I was told it may be a fuel issue with the pressure. A good note to go by is if it is an intermitent thing ( comes and goes) its usually electrical, and if its running...

I took the timing chain cover off and put cylinder #1 at top of cylinder head. The chain marks on the small and big gear do not line up! Also how much slack should be in the chain. Is there a tensioner on my rig. Could this be my issue? Thanks again you've been a great help

I have not however, I do have a furl pressure gauge in it that seems to be working but I guess you never know. Should I check it from the fuel rail? Tank

could it be the timing chain or tensioner. I have the valve cover off right now and am a little confused at what I'm seeing. Its supposed to have comp cam kit in it but the lifters and springs look stock. Also the lifters are tight and cant wiggle them at all. There are maybe 2-3 that I can...

great! So I should pull the head off and check all of that huh! Will I have to replace the cam or just the valves, lifters and springs? Thanks again

OK, In 10/2005 there was a brand new Cam kit, connecting rods, pushrods, a lifters put in the rebuilt motor. So there is less than 10000 miles on this. Would there be an issue with those items failing this quick, if so where should I start and what is the proper was to diagnosis the issue and...

what makes you say Cams or valves and what is the fix....New cam, or valve adjust? thanks

I have a 1995 yj with a 4.0 liter. It has some upgrades like the 62mm throttle body, banks cat back exhaust, cold air intake. It drives fine at normal speeds, but feels like a little hesitation is there, kinda like missing some power. NOW the real issue I have is that at High RPM shen I get...