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Unread 11-14-2011, 08:28 AM   #1
speedbucket
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1993 ZJ 
 
Join Date: Jan 2011
Location: chesapeake, VA
Posts: 3,556
Smell gas in my oil

93
5.2L
253K

I noticed my oil pressure at 1750rpm (cruise at 55mph) was steady at 50 when it is normally 55-60 so i checked my oil and it smells of fuel and seams to be a little thin, good color, but im at 3k on this oil.

i know that i've got 250k miles on my rings and that may be a culprit but i'm thinking no on that because this has only started in the last week and i would have noticed that gradually over time so heres what im thinking

-Bad injector maybe??
leaking out alot after from residual fuel pressure after running or overnight and seeping past the rings?

-no slow starts but i would think the pump would prime quick enough to not let me notice it
- i do have a puff off smoke on start from cold or if it sits for a couple minutes which could be plenum (trying to make it through hunting season before tackling this) or a loaded cylinder from leaking injector right?

- noticed a slight decrease in mileage

- every 10 days or so it will throw a "22" for 30 seconds -egr code

-It idles steady at 650-700rpms
i do not feel a noticeable shake at idle but my mid/low throttle seems pretty weak (thinking plenum) and i have some light smoke out the valve cover/dip if i remove when running, which i figured is just high mileage blow by

my first thought is to:
- throw a fuel pressure gauge on the schraeder valve on the rail and see what it does over night
- check for wet spark plug?i figured i would feel a dead cylinder though
-install stick of dynomite and take cover
- compression check, ive never done one before
hopefully you engine gurus (rat,bad bird, techno, ......etc.. oh and even caliguiri if you can post coherently) can help me out here

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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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Unread 11-14-2011, 08:31 AM   #2
Shadowless127
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my oil pressure is never 55-60 at load....
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Unread 11-14-2011, 08:34 AM   #3
speedbucket
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Quote:
Originally Posted by Shadowless127 View Post
my oil pressure is never 55-60 at load....
it holds steady at 38-40 at idle and and normally is 60ish at load
granted that is with 3k on oil and if freshly after oil change it is 65-70 under load
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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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Unread 11-14-2011, 09:45 AM   #4
JS97ZJ
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leaky injectors
when to engine is off fuel is still dripping into the crank via the pistons.
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Unread 11-14-2011, 11:35 AM   #5
PolkaPower
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I thought it was normal to have a little gas smell? At least from what I have read.
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Unread 11-14-2011, 12:21 PM   #6
wsar10
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replace PCV ??
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QUOTE=billzcat1;wsar10 is right on point on this oil thread - as usual. Anyone reading this would be well-served taking his advice.


-03 WJ laredo 4.0 120k a few minor mods
-93 XJ 5spd, 3" zone lift
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Unread 11-14-2011, 01:09 PM   #7
speedbucket
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Pcv is 4k old.
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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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Unread 11-14-2011, 01:46 PM   #8
1717pxcb
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every car i've had - oil always smelled a bit like gas
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Unread 11-22-2011, 08:40 PM   #9
ZJPunk98
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any update?
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Unread 11-22-2011, 08:48 PM   #10
Fishhead
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Oil should not smell like gas!!!!!, a burnt smell maybe.

I don't know the cause of your problem but something is not right.

My push mower just had the same problem and was the carb gasket where it bolts to the gas tank,,,different I know but,,,,,,,,,,,,,,,,
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Unread 11-23-2011, 02:27 AM   #11
ErikTheRad
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If you've got a vehicle with 100k+ on the odometer, go out and pull the dipstick and tell me you don't smell a bit of gas. IMO, this is hardly cause for alarm.
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Unread 11-23-2011, 03:29 AM   #12
speedbucket
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I am yet to do anything with it. I know what high mileageoil smells like. I would not be wasting everyone's time if it was normally like that. Thanks for reading and I will proceed with my diagnosis thoughts from my first post since no posted anything better
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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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Unread 11-23-2011, 05:56 AM   #13
wsar10
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there's always the obvious......Rings !
When our go-karts or min-bikes get gas smell in the oil we usually start ordering parts for a rebuild and change the oil every day we ride until the rebuild
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QUOTE=billzcat1;wsar10 is right on point on this oil thread - as usual. Anyone reading this would be well-served taking his advice.


-03 WJ laredo 4.0 120k a few minor mods
-93 XJ 5spd, 3" zone lift
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Unread 11-23-2011, 07:02 AM   #14
Candymancan
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Quote:
Originally Posted by ErikTheRad View Post
If you've got a vehicle with 100k+ on the odometer, go out and pull the dipstick and tell me you don't smell a bit of gas. IMO, this is hardly cause for alarm.


Ok went out checked both Jeeps. Nope no gas smell.

Get a compression test done
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Unread 11-23-2011, 07:19 AM   #15
wsar10
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Quote:
Originally Posted by Candymancan View Post
Ok went out checked both Jeeps. Nope no gas smell.

Get a compression test done
My ZJ is at 200k and no gas smell, the WJ @130k no gas smell
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QUOTE=billzcat1;wsar10 is right on point on this oil thread - as usual. Anyone reading this would be well-served taking his advice.


-03 WJ laredo 4.0 120k a few minor mods
-93 XJ 5spd, 3" zone lift
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