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Old 03-31-2012, 05:04 PM   #1
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Thumbs down Oil smells like gas

Think something's wrong.
My oil smells like gas.

Gaskets? Piston rings? One guy said fuel pump diaphragm , huh?

What y'all think?

All insight is appreciated.

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Old 03-31-2012, 05:05 PM   #2
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Originally Posted by Mattwahl28 View Post
Think something's wrong.
My oil smells like gas.

Gaskets? Piston rings? One guy said fuel pump diaphragm , huh?

What y'all think?

All insight is appreciated.

Oh yeah , 99 jeep wrangler
Inline 6 4.0.

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Old 03-31-2012, 05:27 PM   #3
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Rings would be my guess. How many miles? What's the history of the engine?

The fuel pump diaphragm issue would only apply if you were running a much older engine with a mechanical, cam-driven fuel pump, which you are not - yours is in the tank, in a big filter sock thingee.
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Old 03-31-2012, 05:32 PM   #4
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I'd agree that the rings are likley. It is also possible there is a fuel leak somewhere else and you just hapen to smell it whjen checking your oil. Is that when you got the smell?
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Old 03-31-2012, 05:41 PM   #5
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Is the smell from the oil during an oil change?
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Old 03-31-2012, 06:13 PM   #6
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Does the engine feel like it has a skip? I'm not familiar with the 6 cyl, as mine is the 4. Probably a failed injector.
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Old 03-31-2012, 06:17 PM   #7
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Its not the rings..that would mean it would also be burning oil. If its running rich, I would go with map or coolant temp sensor. The diaphram they were talking about would have been the fuel pressure regulator diaphram in the fuel rail, which could also cause it, but again it would run really rich. Easy way to test it is to pull the vac line off of it with the engine running, if it doesnt pour fuel, its not bad.

My guess (assuming the engine isnt running rich, as you didnt list that as a symptom)is a leaking fuel injector, allowing fuel to leak into the cylinder with the engine shut down. The gas would wash down by the rings and get into the oil.
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Old 03-31-2012, 07:12 PM   #8
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Bad injector.
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Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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Old 03-31-2012, 07:21 PM   #9
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I agree with bad injector. When mine went I had other symptoms also. Misfire on #4 cylinder code, white cloud out exhaust on startup, exhaust smelled like gas, ran like crap at low rpm, fouled plugs, terrible gas mileage, no pressure at fuel rail after turning off engine, took a while to start, oil level a quart high and reaked like gas. Got any of those?
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Old 04-01-2012, 09:15 PM   #10
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I agree with bad injector. When mine went I had other symptoms also. Misfire on #4 cylinder code, white cloud out exhaust on startup, exhaust smelled like gas, ran like crap at low rpm, fouled plugs, terrible gas mileage, no pressure at fuel rail after turning off engine, took a while to start, oil level a quart high and reaked like gas. Got any of those?
Everything you just mentioned is what is happening.
Don't know about the misfire on 4.

I smelled gas when trying to start it. That's when I inspected the dipstick that's where I smelled gas.

Gonna get new injectors, change oil and see if that does it.

Thanks everyone for the input.
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Old 04-01-2012, 09:40 PM   #11
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Quote:
Originally Posted by Mattwahl28

Everything you just mentioned is what is happening.
Don't know about the misfire on 4.

I smelled gas when trying to start it. That's when I inspected the dipstick that's where I smelled gas.

Gonna get new injectors, change oil and see if that does it.

Thanks everyone for the input.
What year is your Jeep? Do you have the check engine light on?
In my case I only changed the #4 injector, but a few other injectors had bad O-rings that were letting air into the engine by the injector. Once I looked at them it was a dead give-away, there was dirt built up all around where the injector plugs into the engine from where it was getting sucked in. The O-rings are really cheap, I called every parts store near me and could only turn up one injector, and because of the #4 misfire code that was the only one I changed. I did change all of the O-rings on the injectors on the side that plugs into the engine, and would recommend you do the same. My 4.0 had about 115,000 on it at the time, and the O-ring on the #2 injector was completely gone and the others were in bad shape. They are quick and easy to change, and I'd definitely do it while the fuel rail is off before removing it all over again. Let me know if you have any questions on the install, I had a hard time finding info on it, other than lots of people saying that they never go bad... Worked like a charm on mine.
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Old 04-02-2012, 12:19 AM   #12
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I see now yours is a 99. I read on here that 98-00 don't have the key trick feature for showing codes. So you may need a code reader or a parts store that will run them for you. That may save you some money if you don't want to replace them all. If nothing else, it may give you some reassurance. You'll want to put in a new set of plugs after you install the new injector/O-rings, which ever injector(s) is causing the problem will foul them. I went through 3 sets of plugs in a day troubleshooting mine. My #4 would foul almost immediately when that injector went, and the ones with bad (or no) O-rings weren't far behind.
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Old 04-05-2012, 11:39 AM   #13
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Any progress?
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Old 04-06-2012, 08:27 PM   #14
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Any progress?

Yep. It was the o rings. Those injectors were a pain to get out.
I pulled them out , reconnected the rail and harnesses then I put each one in a bottle to see them spray. I'm sure there was a more technical way to check them but I'm redneck.

The rings and the holes at the head were bad dirty and one of the rings were shot. Guess which one ? The number 4.

After replacing the rings I went ahead and replaced the plugs. And it runs like it used to.

Thank you everyone for the help and mr Harry you were a BIG help. Thanks again.
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Old 04-06-2012, 08:34 PM   #15
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No problem, glad it's running good again. I heard a hiss from under the hood a day after my install. I wondered why the #3 injector was turned to the 1 o'clock position when I took it apart... I just reached in and turned it at a stop sign and it stopped, and has been fine ever since. Just in case you run into that, it's something to try.
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Old 04-06-2012, 08:35 PM   #16
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Oh yeah. I forgot to mention.
When I did the "spray test ". The number two injector kept leaking out fuel when it wasn't cranking. So I replaced it. And I changed the oil. Lol
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Old 04-06-2012, 08:42 PM   #17
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That one was responsible for a few problems... As long as you cleaned the ports on the engine they slide into, lubed them with oil, and jammed them in there good, you should be all set. Consider it an "oil flush". Lol

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