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Old 09-16-2013, 06:31 PM   #1
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Yj Problem! Please Help!!!

When I first bought my 1991 jeep wrangler islander 4.0 manual fuel injected six cylinder with 99,000 mi, it was running without any problems. Shifted smooth and ran great.

Problem:

Eventually it started to smoke out the tailpipe. The smoke was white and it was sputtering, not a constant white smoke. Then the smell became very rich and I could smell it sitting in the drivers seat. I started to feel and hear backfiring and the jeep hesitated when I pressed the pedal and it felt like it was misfiring while driving...and thats when I stopped driving it.

Attempts to fix the problem:

I filled the tank with gas and put fuel injector cleaner in it. I checked the coolant and it seemed ok. I checked the oil and it smelled like gas inside it so I did an oil change and when the oil came out, there was definitely gas mixed in it. It was a watery consistency and there was probably two more quarts that it should have had in it. replaced the oil filter and put new 10w 30 valvoline oil and now the white smoke is constant. Then we assumed it needed a tuneup so I bought new spark plugs, wires, cap and rotor. It did make the jeep run better and it didnt sound like it was bogging down, but white smoke was still coming out the tailpipe. With those ideas being busted, we now think that it could be 1 of 4 things.

Possible Solutions:

1. The fuel injectors could be sticky and one might be stuck, allowing too much fuel into the engine.

2. The Electronic control unit could be bad and the timing could be off.

3. Cracked exhaust manifold gasket allowing gas to enter the cat converter and exhaust

4. Bad O rings

Research conclusion:

Ive done a lot of research and people with this common issue replaced the ecu and the tailpipe stopped spraying fuel and over time the rest of the crap inside of the exhaust burned off and the white smoke went away. I think I might check the injectors first and see the condition they are in. Then the O rings will be examined. Following a replacement of the ecu. I am praying its not the gasket but if these are not the problem, its the last resort.

I need this jeep running, its my only vehicle.

If anyone had this problem with the white smoke and fuel in the exhaust, please help!

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Old 09-16-2013, 08:45 PM   #2
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how is the oil pressure? does it get hot? hard to start? if gas is really getting into the engine block then its ether the head gasket or piston rings or valve guides. So I would most definitely believe there is something worn inside the engine. Do a compression test. Or there could be a cylinder head issue. Like a crack in one of the valve journals on the intake side and when fuel is injected then that could be letting gas into the engine through the cylinder head. You could remove the head and have it checked and rebuilt but do some test first.

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Old 09-16-2013, 09:30 PM   #3
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Smoke is white? I thought fuel in the oil would create black smoke.
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Old 09-16-2013, 09:56 PM   #4
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oil pressure is good, its not hard to start. I am praying its not the head gasket or exhaust manifold gasket. im going to check the injectors tomorrow and use an ohm meter to check if any are bad. then if i replace them, i will see if the problem is fixed. if not, i will try the gasket.

The smoke is white because the fuel is not being ignited. Coolant in the exhaust is white smoke. Oil in the exhaust is blue smoke. gas in the exhaust is black smoke. But the problem with my jeep is that it is pushing not only white smoke but also spitting out gas from the tailpipe.

Still not clear what exactly is going on. Help me haha.
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Old 09-16-2013, 10:14 PM   #5
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I would check the fuel pressure. Sounds like its running very rich to me and a symptom is not enough fuel pressure. I would also do a compression check. Good luck
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Old 09-16-2013, 10:40 PM   #6
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fuel pressure is good and the gauge is working. It is a rich smell. I had put fuel injector cleaner in the gas tank when i filled it up which explains the white smoke but the white smoke is now constant and has not stopped. the smoke and the gas coming out of the tailpipe could be separate problems occurring at the same time.

does anyone have or had the same problem?
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Old 09-16-2013, 10:46 PM   #7
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Quote:
Originally Posted by AutobotWrangler View Post
fuel pressure is good and the gauge is working. It is a rich smell. I had put fuel injector cleaner in the gas tank when i filled it up which explains the white smoke but the white smoke is now constant and has not stopped. the smoke and the gas coming out of the tailpipe could be separate problems occurring at the same time.

does anyone have or had the same problem?
Hoping its different for you. I had the exact condition in a Chevy truck and it was the head gasket.
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Old 09-17-2013, 10:03 AM   #8
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the check engine light came on and it had the codes 12 , 24 , 27 , 33 , 55.

12 is because the battery was disconnected and 55 is end of codes.

24 was the throttle positioning sensor which i just replaced and it should take that out of the equation.

27 is the tbi injector does not respond properly to control signal

33 is the air conditioning clutch relay circuit which goes off but i dont have ac so thats out of the equation.
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27 is probably going off because one of the injectors are bad.

am i mistaken or could it be a faulty injector that is letting too much gas into the engine?
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Old 09-17-2013, 10:07 AM   #9
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Certainly could be. I would have replacement gaskets for the injectors handy, might as well change them if you are pulling them.
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Old 09-17-2013, 09:46 PM   #10
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UPDATE:

I just tested each fuel injector by using an ohm meter. Started from the back and worked my way up to the front. All of them read 17ohm except the first injector. The first injector did not read anything.

When i turned the ohm meter on, i had it at 1 and when i placed it on an injector, it read 17. but when i placed it on the first injector, it stayed at 1.

It did not look like there was any corrosion or rust on the metal plates of the injector and i know it was a good connection. I also changed back and forth between injectors just to make sure the ohm meter was working.

I have a feeling its the first injector so i ordered a new one and will replace it.

Does anyone know if this could be the reason the exhaust is spitting out fuel and white smoke? and is it bad to have one new injector working with 5 old injectors?
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Old 09-17-2013, 10:32 PM   #11
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Have you pulled the plugs? If you are flooding a cylinder.enough to have raw fuel spewing out the back.your plug should be seriously flawed. It shouldnt be hard to.pick out.which.cylinder is the bad one.
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Old 09-18-2013, 07:17 AM   #12
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I had a similar problem and there was condensation in the gas tank, I just got a bottle of HEET and it evaporated all the water , doesn't hurt to try
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Old 09-18-2013, 01:09 PM   #13
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Dunno about running 5 old ones with one new one. I'd imagine if you getting consistent readings with the 5 old ones and when you measure the new one and get the same reading you should be OK.
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Old 09-18-2013, 06:07 PM   #14
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Originally Posted by 87 Florida YJ View Post
Hoping its different for you. I had the exact condition in a Chevy truck and it was the head gasket.

This. Is your radiator full?
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Old 09-18-2013, 10:08 PM   #15
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Update:

I replaced the first injector because it wasn't reading with the ohm meter hooked up to it.

Got the new one and tested it and it read 19, which was 2 more than the rest which were 17. I then started the jeep and it was still pushing white smoke and liquid was coming out the tailpipe, but it didnt seem like fuel, more like condensation mixed with a little fuel. Eventually i revved the engine a few times and decided that taking it for a spin around the block would help me see if it got better or worse.

halfway it started smoking from the exhaust and engine so i drove right back home. I left it idling for about 10 min and eventually the smoke cleared and no fuel was leaking/ spitting from the tailpipe.

In conclusion:

I went through a full tune up, spark plugs, wires, cap and rotor, throttle positioning sensor, air temperature sensor, and an oil change, and finally a fuel injector.

Looks like the bad fuel injector was the reason it was letting the fuel into the exhaust because it was probably stuck open.

Hopefully no other problems arise but i will keep everyone posted. As far as i know, there could be some crap in the cat converter and muffler which will probably need to be replaced soon. Right now im a happy jeeper and learned a few more things about the jeep i just bought.

Thanks for all the support! Friend me and keep in touch.

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