raw gas coming form tailpipe
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Seasoned Member
Joined: Jan 2011
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From: brandenburg ky
Year: 1990
Model: Cherokee
Engine: I6
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
my ? is what is the cause of this injectors or something
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 474
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From: brandenburg ky
Year: 1990
Model: Cherokee
Engine: I6
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
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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Joined: Jan 2012
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From: Valley Park, MO
Year: 1989
Model: Cherokee
Engine: 4.0L Renix Freshly Rebuilt!!
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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Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 474
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From: brandenburg ky
Year: 1990
Model: Cherokee
Engine: I6
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.
Seasoned Member
Joined: Jan 2012
Posts: 422
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From: Valley Park, MO
Year: 1989
Model: Cherokee
Engine: 4.0L Renix Freshly Rebuilt!!
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.
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 474
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From: brandenburg ky
Year: 1990
Model: Cherokee
Engine: I6
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 474
Likes: 0
From: brandenburg ky
Year: 1990
Model: Cherokee
Engine: I6
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
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%?).
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%?).





