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raw gas coming form tailpipe

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Old May 18, 2012 | 06:01 PM
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From: brandenburg ky
Year: 1990
Model: Cherokee
Engine: I6
Exclamation raw gas coming form tailpipe

ok so we started my jeep and let it run for 1 to 3 min and shut it off(son had to go potty) so we shut it off and it took about 3 min till we started it back up but as i was walking to the jeep my wife started it and i saw a puff of water or so i thought shoot out of the tail pipe on to the ground so i check and its raw gas

my ? is what is the cause of this injectors or something
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Old May 18, 2012 | 06:31 PM
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Moved to tech.
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Old May 18, 2012 | 06:33 PM
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You sure it's raw fuel and not left over condensation from the muffler?
How's it run otherwise?
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Old May 18, 2012 | 09:15 PM
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From: brandenburg ky
Year: 1990
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it runs ruff at start up and smell like its running rich, could be condensation but it was ran for about an hour before it was shut off and set maby 30 min to 1 hr the temp was still about 150deg

the running ruff part will clear up about 5 sec in to driving or u can just rev it up and it will clear up some times there is a very bad miss too

sorry didnt now if this was considered tech so i put in chat
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Old May 18, 2012 | 09:20 PM
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;-) no worries, just want ya to get the best help possible
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Old May 18, 2012 | 09:36 PM
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Probably not an issue with the injectors... The raw gas smell was probably wet combustion chamber (due to the quick shut off). Once the exhaust valve opened it kicked out the fuel vapor which made it seem like you had gas coming from the pipe... As far as the liquid coming out it sounds like condensation.
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Old May 18, 2012 | 09:37 PM
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Stuck injector...plugs/wires/cap/rotor...o2 sensor...could be a number of things.
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Old May 18, 2012 | 10:07 PM
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From: brandenburg ky
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Originally Posted by cmartin2112
Probably not an issue with the injectors... The raw gas smell was probably wet combustion chamber (due to the quick shut off). Once the exhaust valve opened it kicked out the fuel vapor which made it seem like you had gas coming from the pipe... As far as the liquid coming out it sounds like condensation.
it could be condensation it just seem weird only because ive seen condensation drip form the tailpipe but never come out like a sudden spray/puff that is why i was concerned
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Old May 18, 2012 | 11:00 PM
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From: Valley Park, MO
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What might have happened is the exhaust didnt get a chance to get hot enough to burn all the water out of there and you just had that little extra amount... How fast did the liquid that came out evaporate? Gas will evap pretty quick and will look like a mirage (sp) right above the liquid.
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Old May 18, 2012 | 11:40 PM
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Injectors leaking based on ruff start, does it crank for awhile before start sometimes?
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Old May 19, 2012 | 01:14 PM
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From: brandenburg ky
Year: 1990
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Originally Posted by bnkk
Injectors leaking based on ruff start, does it crank for awhile before start sometimes?
at times yes but it is a renix though
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Old May 19, 2012 | 02:11 PM
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The renix have long crank times so it's a normal thing.
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Old May 19, 2012 | 08:21 PM
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if you actually had raw fuel in the exhaust systems, you'd be getting backfires that would blow the muffler clean off the Jeep.
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Old May 19, 2012 | 08:27 PM
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From: brandenburg ky
Year: 1990
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Originally Posted by Marcucco
if you actually had raw fuel in the exhaust systems, you'd be getting backfires that would blow the muffler clean off the Jeep.
true never thought of that (i do have a glasspack though) so no muffler to blow off (no restriction)
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Old May 19, 2012 | 11:41 PM
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If those are the stock injectors, allot of guys can those and go to the four hole design even if they happen to be working right.

Checked your MAP tube? There is a little tube from the inside of the TB, back, up to the MAP there on the firewall. Off, cracked or plugged and the MAP will tell your ECU you have your foot in it.

I really doubt that's gas. I'd put a tiny bit on a stick or a rolled up piece of paper and see it it lights if I wasn't sure.

Gas vapor needs to be within a certain range to explode. Too rich and it actually won't go bang! (36%?).
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