Yj ?

78cj5Guy

Well-Known Member
Joined
Mar 22, 2011
Location
Wilmington,Nc
93 4.0l was running fine put about 500 miles on it the past 2 to 3 weeks i drove from my house then to go eat then went to gas station then to my grandparents house and it sat pretty much the rest of the day then around 9 that night I went to start it it started fine ran for about 20 minutes then just died and won't start back up anyone got a idea of what the problem is looks to have a real weak spark now
 
Last edited:
I second the CPS.
 
93yjman said:
I would if I new how I think I may have it towed to a Guys shop I no on church st this is my first injection jeep so it's kinda got me stomped carbs are way easier for me
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You screw a fuel injection pressure gauge onto the Schrader valve on the fuel rail.

It's common for the ethanol in the fuel to ruin the hose that connects the fuel pump to the sending unit.

What makes you think you have weak spark?

Usually if it's cps, you have no spark, as the ECU doesn't know when to fire the coil. Typically also quits when the sensor gets hot, and will sometimes work again when cold.

It only needs fuel, spark, and compression to run. Starting ruling out one system or another and check big thinks and work to smaller ones.

Check fuel pressure, should have 39-45.

Check for spark at plug.

Narrow down your problem.
 
Mac5005 said:
You screw a fuel injection pressure gauge onto the Schrader valve on the fuel rail.

It's common for the ethanol in the fuel to ruin the hose that connects the fuel pump to the sending unit.

What makes you think you have weak spark?

Usually if it's cps, you have no spark, as the ECU doesn't know when to fire the coil. Typically also quits when the sensor gets hot, and will sometimes work again when cold.

It only needs fuel, spark, and compression to run. Starting ruling out one system or another and check big thinks and work to smaller ones.

Check fuel pressure, should have 39-45.

Check for spark at plug.

Narrow down your problem.
Click to expand...
I just talked with my brother about it and he seems to think I got a tank full of water as I just put $30 worth of gas in it 13.9 gallons from sams he says water in gas makes sense since all the water we just had from the storm and I only have like 2.9miles on the tank before it quite on me he sad go get some stuff to get water out the tank and bleed fuel lines at fuel rale has spark just seems like a weak spark to me but I have never checked spark on this jeep before so I don't no what it looked like if it is weaker now then before or if it's the same I don't have a fuel injection gauge maybe parts store will rent one
 
How do you know it has "weak" spark? How are you checking this? If it truly has a weak spark then your only cause for this is A- bad coil B- worn out cap C- worn out distributor (common on these) D- bad wires.. all of these USALY run like shit before not running at all. A fuel pump could cause your problem, or with all this rain the tank at the gas station may of got water in it, this would definitely cause your problem!! Again I would like to know how you determined it has a weak spark...
 
Or you use the hose off the fuel gauge and jump the fuel pump relay. Instant fuel. I'd recommend taking the line off the inlet side of the filter to drain the tank though. It won't be completely empty by pumping it out but pretty close.
 
Tried bleeding the fuel rale this morning and put some heat water remover last night so ended up having it towed to shop will let y'all know the out come when I know I just don't have time to keep messing with it and playing a guessing game
 
93yjman said:
Tried bleeding the fuel rale this morning and put some heat water remover last night so ended up having it towed to shop will let y'all know the out come when I know I just don't have time to keep messing with it and playing a guessing game
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4 people told you the cps. Did you try that?
 
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