Difficult start and smoke after injector swap
06-30-2014, 07:14 PM
#1
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Year: 2000
Model: Cherokee
Engine: I6
Difficult start and smoke after injector swap
first off, i want everyone to know that i did a search to find similar topics, but i couldn't find a solution. that said, here is my problem:
my 2000 xj was starting up just fine, but i heard so much about the bosch 4 port injectors that i figured i'd give it a try. the results went a little something like this here...initially, the jeep was all fudged up. it smoked like hell and wouldn't idle. after about 4 or 5 starts, it started to mellow out. after about 10 or so starts, it ran VERY well. much more responsive, and a smoother idle that ever. after about start #11, the starter would draw down real low, kind of like when you leave the lights on and have just enough juice to start the car...but just barely. it would crank a few times, then draw down real low like it was cutting out, then crank back up to speed a few times and start. when it starts, it blows a huge cloud of smoke out the back like uncle buck. the smoke continues for about 30 seconds and then runs fine again. i figure i'm somehow getting fuel back into my cylinder from a stuck injector, but these things were new. it never did any of this before. i called jeep, and they could only troubleshoot if the oil pressure was low, but it is fine. i'm baffled. no check engine light or anything. like i said before, it runs perfectly once up and running, but it does that one, weird draw down and blows smoke for about 30 seconds. any ideas?
my 2000 xj was starting up just fine, but i heard so much about the bosch 4 port injectors that i figured i'd give it a try. the results went a little something like this here...initially, the jeep was all fudged up. it smoked like hell and wouldn't idle. after about 4 or 5 starts, it started to mellow out. after about 10 or so starts, it ran VERY well. much more responsive, and a smoother idle that ever. after about start #11, the starter would draw down real low, kind of like when you leave the lights on and have just enough juice to start the car...but just barely. it would crank a few times, then draw down real low like it was cutting out, then crank back up to speed a few times and start. when it starts, it blows a huge cloud of smoke out the back like uncle buck. the smoke continues for about 30 seconds and then runs fine again. i figure i'm somehow getting fuel back into my cylinder from a stuck injector, but these things were new. it never did any of this before. i called jeep, and they could only troubleshoot if the oil pressure was low, but it is fine. i'm baffled. no check engine light or anything. like i said before, it runs perfectly once up and running, but it does that one, weird draw down and blows smoke for about 30 seconds. any ideas?
06-30-2014, 07:44 PM
#6
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Year: 1999
Model: Cherokee
Engine: 4.0
first off, i want everyone to know that i did a search to find similar topics, but i couldn't find a solution. that said, here is my problem:
my 2000 xj was starting up just fine, but i heard so much about the bosch 4 port injectors that i figured i'd give it a try. the results went a little something like this here...initially, the jeep was all fudged up. it smoked like hell and wouldn't idle. after about 4 or 5 starts, it started to mellow out. after about 10 or so starts, it ran VERY well. much more responsive, and a smoother idle that ever. after about start #11, the starter would draw down real low, kind of like when you leave the lights on and have just enough juice to start the car...but just barely. it would crank a few times, then draw down real low like it was cutting out, then crank back up to speed a few times and start. when it starts, it blows a huge cloud of smoke out the back like uncle buck. the smoke continues for about 30 seconds and then runs fine again. i figure i'm somehow getting fuel back into my cylinder from a stuck injector, but these things were new. it never did any of this before. i called jeep, and they could only troubleshoot if the oil pressure was low, but it is fine. i'm baffled. no check engine light or anything. like i said before, it runs perfectly once up and running, but it does that one, weird draw down and blows smoke for about 30 seconds. any ideas?
my 2000 xj was starting up just fine, but i heard so much about the bosch 4 port injectors that i figured i'd give it a try. the results went a little something like this here...initially, the jeep was all fudged up. it smoked like hell and wouldn't idle. after about 4 or 5 starts, it started to mellow out. after about 10 or so starts, it ran VERY well. much more responsive, and a smoother idle that ever. after about start #11, the starter would draw down real low, kind of like when you leave the lights on and have just enough juice to start the car...but just barely. it would crank a few times, then draw down real low like it was cutting out, then crank back up to speed a few times and start. when it starts, it blows a huge cloud of smoke out the back like uncle buck. the smoke continues for about 30 seconds and then runs fine again. i figure i'm somehow getting fuel back into my cylinder from a stuck injector, but these things were new. it never did any of this before. i called jeep, and they could only troubleshoot if the oil pressure was low, but it is fine. i'm baffled. no check engine light or anything. like i said before, it runs perfectly once up and running, but it does that one, weird draw down and blows smoke for about 30 seconds. any ideas?
07-01-2014, 05:39 AM
#7
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Year: 2000
Model: Cherokee
Engine: I6
yeah i reset the ecu and there are no codes. i'll give the paper towel trick a shot. the leaking injector was my suspect from the start, but i'm just in denial at the moment. i hate it when new equipment fowls!
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