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Old 10-10-2013, 03:21 PM   #1
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Exclamation Calling all yj mecanics! I need help

Okay guys, here's my situation.

I've already posted on here once without much response and I got a problem that seems like there isn't much info about. PLEASE give me ANYTHING that even crosses your mind because I'm really losing faith fast.

92 YJ, 2.5L, its got about 165XXX but motor is rebuilt.

It had run great for about a year, but a few months ago it started this brief sputtering while pulling, just a little miss like I had low fuel. I would stop at a station, put gas in and it would be alright.

The problem started getting worse, although I've run out of gas quite a few times (bad gas gauge), but it started with a rough idle too about two months ago. The problem really got bad after I ran it empty one day and it backfired like a Harley and died on me. I put gas in, but since that day its had a really bad misfire, sputtering problem (even with plenty of gas) and idles rough. It got to the point that it would barely start and I had to have it towed to a local shop and they said it was a bad coil and changed it. It ran great for about 2 days but then started acting up when it gets warm again.

As of today, 5 minutes ago in fact, it starts up fine cold, but the idle gets rougher as it gets warmer, and then when I reaches about 170, it stays there (never gets to 210) and the sputtering and stalling is terrible. It will drive and idle fine until it gets to about 130 then it begins to get rougher until it reaches its hottest of 170 and just isn't even drivable.

Here's what I have replaced since the problem started:

Dropped the tank and changed the fuel lines and filter (not the pump)
Replaced the starter (went bad on me)
Replaced distributor cap
Replaced plug rotor
Replaced some vacuum lines
New engine coil (helped the problem a little)

I've heard things about sensors, so that's where I am now. When I unplugged the 02 sensor today and let it heat up, there is absolutely NO difference in how it runs whether the 02 is hookup up or not. That probably means its bad, right?

I am also getting NO codes besides the regular 12-33-55

That's a lot to take in but PLEASE guys, give me anything you can offer, I'm getting to the point where I'm losing my Jeep love affair and if anybody knows me, they know what a huge statement that is.

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Old 10-10-2013, 03:37 PM   #2
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Change the fuel pump. Sounds like it's loosing fuel pressure the longer the pump runs. Weak pump = low pressure = rough idle. This would be were I would start. Also will your at it check your plugs. I had one a week ago that was intact enough to idle but would miss every so often and I could notice on my 4cyl.

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Old 10-10-2013, 03:50 PM   #3
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^^ I believe the fuel pump uses fuel for it's own lubrication so yea, that could be the issue. Considering how many times you have run it out of fuel it wouldn't surprise me if you toasted it.
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Old 10-10-2013, 04:09 PM   #4
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fuel pump. Start the jeep and run it until it runs bad and if you can check the fuel pressure.
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Old 10-10-2013, 04:16 PM   #5
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try running it without the gas cap on.. I found a pinched vacuum hose between the vapor canistor and the gas tank. it would run like crap when i had a quarter tank of gas or less.
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Old 10-10-2013, 05:04 PM   #6
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Sounds like fuel pump and or fuel pressure regulator
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Old 10-10-2013, 06:12 PM   #7
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fuel pump. those things are designed to be "cooled" by the gasoline it's submerged in. By running the tank dry you burn up the pump. Replace it. should be ok.
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Old 10-10-2013, 06:31 PM   #8
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also might check your vent on your cap...russ
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Old 10-10-2013, 08:14 PM   #9
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Your pump problably burned up. When mine went bad it started with a sputter every minute or so going like 50mph. Then a week or so later it went to bucking and was undriveable. It would idle fine though. As soon as I put my foot on the gas it tried to throw me out of the jeep.
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Old 10-10-2013, 10:14 PM   #10
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I'm not convinced its a fuel pump. I had a similar problem and it turned out to be the wrong fuel line between the fuel pump and the hard line out of the tank. That line should be " submersible" type. Non submersible type tends to swell and crack and fuel pressure is lost.
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Old 10-11-2013, 01:16 AM   #11
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Check your injectors
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Old 10-11-2013, 11:17 AM   #12
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Okay guys, fuel pump was the first issue that I figured when I dropped the tank, used a fuel pressure reader last night and got a consistent 39-40 psi reading, whether its hot, cold, missing or not, the pressure is still the same. This one's crazy guys, I'm at a loss.
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Old 10-11-2013, 11:23 AM   #13
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The other thing is, I tested my thermostat and it isn't working right, it's not opening up like it should, and I have absolutely ZERO coolant even when it heats up. This makes me think I could be overheating without knowing it and running like crap. Would that be a issue does anybody know?
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Old 10-11-2013, 11:38 AM   #14
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I don't have a 2.5 so I am not sure of what it has or doesn't have, but your symptoms sound like it is related to a temp triggered sensor, either coolant or electrical based, that is not working correctly as the vehicle warms up.
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Old 10-11-2013, 11:52 AM   #15
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Quote:
Originally Posted by CJ5_fan View Post
I don't have a 2.5 so I am not sure of what it has or doesn't have, but your symptoms sound like it is related to a temp triggered sensor, either coolant or electrical based, that is not working correctly as the vehicle warms up.
Would that cause the missing and sputtering when it heats up? There is no doubt I have a temp issue because as I said, it never reads past 170, yet no coolant is ever in the tank or getting to the radiator, and I just poured half a bottle in last night with no change. Also, my heater no longer works so I know there is a temp problem. Would that be causing the whole thing though?
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Old 10-11-2013, 12:13 PM   #16
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well, on my CJ5 304 motor, there are CTOs that operate vacuum routing and they could effect everything from Dizzy advance to when the EGR dumps. Also, on my i6 4.2l Wrangler, there are solenoids that are intended to trigger other components including the air diverter valves for the emissions. I had one that had failed and my motor ran like crap every time the computer activated them - which is supposedly only at certain times and conditions.

If it is running fine cold, and runs like crap when it heats up - and you have checked for obvious vacuum leaks which may be exasperated by heat expansion (manifold, carb base, etc) the I would check all the systems that are intended to be activated only on warm engine conditions.
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Old 10-11-2013, 02:16 PM   #17
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Just put a new thermostat on out in the garage. Hopefully that helps with my heat problem. I just don't know guys. Anybody think it could be a clogged or bad cat converter?
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Old 10-11-2013, 03:10 PM   #18
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UPDATE: Put in the new thermostat and my gauge is FINALLY reading up at around 200-210, not going over at all. I let it heat all the way up and took it on a drive and so far we're doing good! I still have a slight miss with acceleration, but I'm thinking that could just be my plugs and plug wires because I do need to finish my tune up. It is definitely drivable and the rough idle has pretty much gone away, it wasn't getting any rougher as it got hotter. I think a lot of my problem was overheating without even knowing it. Any advice on the slight miss I'm still getting?
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Old 10-11-2013, 03:21 PM   #19
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Finish your tune up including new quality plug wires. My cheap wires were arcing on the block, put MSD's on and it runs smooth. Since you know you were overheating badly and regularly, keep an eye on your fluids including oil to make sure you didn't crack the head when it got hot. If the oil looks milky you have a problem, also check the exhaust after it warms up to see if steam is coming from the tail pipe, another issue if you ran it too hot.
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Old 10-12-2013, 12:18 PM   #20
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Quote:
Originally Posted by reno92 View Post
Finish your tune up including new quality plug wires. My cheap wires were arcing on the block, put MSD's on and it runs smooth. Since you know you were overheating badly and regularly, keep an eye on your fluids including oil to make sure you didn't crack the head when it got hot. If the oil looks milky you have a problem, also check the exhaust after it warms up to see if steam is coming from the tail pipe, another issue if you ran it too hot.
Took it out today and the sputtering and missing has almost completely gone away. The rough idle is also gone. The only problem now it my heat went out and my radiator is leaking...

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