99 Cherokee Bucking Problem
 

Hi,

The past few weeks, I have noticed a sporadic bucking problem with my 1999 6
cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
vehicle performs normally. But sometimes when I need a little kick (an
example would be getting on the highway) the vehicle bucks a few times. I
would have already brought it into the mechanic, but this doesn't happen all
the time (it is actually more noticable with a heavy load in the vehicle or
in warmer weather).

I am using 87 octane (which the manual recommends) and have followed all of
the necessary maintenance recommendations. I'm guessing spark plugs/wires
but I could be wrong.

Has anyone had a similar problem?

Thanks,
Bill

Re: 99 Cherokee Bucking Problem
 

Have the codes read, but I'm willing to bet that there won't be any codes...
I had exactly the identical problem with my 93 XJ, after many trips to the
stealership (no codes were ever captured) the one technician (very good guy
who happens to only work on J**P's) decided that it was worth it to change
out the Crank Position Sensor on speculation, I was given 2 weeks to drive
(before being billed for it) and see if the symptoms returned, 4 years and
thousand's on km's later the problem has never come back..

Snow...


"Goomba" <Goomba99@yahoo.com> wrote in message
news:3f64b17d$1@news-1.oit.umass.edu...
> Hi,
>
> The past few weeks, I have noticed a sporadic bucking problem with my 1999
6
> cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
> vehicle performs normally. But sometimes when I need a little kick (an
> example would be getting on the highway) the vehicle bucks a few times. I
> would have already brought it into the mechanic, but this doesn't happen
all
> the time (it is actually more noticable with a heavy load in the vehicle
or
> in warmer weather).
>
> I am using 87 octane (which the manual recommends) and have followed all
of
> the necessary maintenance recommendations. I'm guessing spark plugs/wires
> but I could be wrong.
>
> Has anyone had a similar problem?
>
> Thanks,
> Bill
>
>
>

Re: 99 Cherokee Bucking Problem
 

Have the codes read, but I'm willing to bet that there won't be any codes...
I had exactly the identical problem with my 93 XJ, after many trips to the
stealership (no codes were ever captured) the one technician (very good guy
who happens to only work on J**P's) decided that it was worth it to change
out the Crank Position Sensor on speculation, I was given 2 weeks to drive
(before being billed for it) and see if the symptoms returned, 4 years and
thousand's on km's later the problem has never come back..

Snow...


"Goomba" <Goomba99@yahoo.com> wrote in message
news:3f64b17d$1@news-1.oit.umass.edu...
> Hi,
>
> The past few weeks, I have noticed a sporadic bucking problem with my 1999
6
> cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
> vehicle performs normally. But sometimes when I need a little kick (an
> example would be getting on the highway) the vehicle bucks a few times. I
> would have already brought it into the mechanic, but this doesn't happen
all
> the time (it is actually more noticable with a heavy load in the vehicle
or
> in warmer weather).
>
> I am using 87 octane (which the manual recommends) and have followed all
of
> the necessary maintenance recommendations. I'm guessing spark plugs/wires
> but I could be wrong.
>
> Has anyone had a similar problem?
>
> Thanks,
> Bill
>
>
>

Re: 99 Cherokee Bucking Problem
 

Make sure your Dist cap and rotor are good, but also make sure your Crank
Sensor is good. I had the same problem on my 93
"Goomba" <Goomba99@yahoo.com> wrote in message
news:3f64b17d$1@news-1.oit.umass.edu...
> Hi,
>
> The past few weeks, I have noticed a sporadic bucking problem with my 1999
6
> cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
> vehicle performs normally. But sometimes when I need a little kick (an
> example would be getting on the highway) the vehicle bucks a few times. I
> would have already brought it into the mechanic, but this doesn't happen
all
> the time (it is actually more noticable with a heavy load in the vehicle
or
> in warmer weather).
>
> I am using 87 octane (which the manual recommends) and have followed all
of
> the necessary maintenance recommendations. I'm guessing spark plugs/wires
> but I could be wrong.
>
> Has anyone had a similar problem?
>
> Thanks,
> Bill
>
>
>

Re: 99 Cherokee Bucking Problem
 

Make sure your Dist cap and rotor are good, but also make sure your Crank
Sensor is good. I had the same problem on my 93
"Goomba" <Goomba99@yahoo.com> wrote in message
news:3f64b17d$1@news-1.oit.umass.edu...
> Hi,
>
> The past few weeks, I have noticed a sporadic bucking problem with my 1999
6
> cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
> vehicle performs normally. But sometimes when I need a little kick (an
> example would be getting on the highway) the vehicle bucks a few times. I
> would have already brought it into the mechanic, but this doesn't happen
all
> the time (it is actually more noticable with a heavy load in the vehicle
or
> in warmer weather).
>
> I am using 87 octane (which the manual recommends) and have followed all
of
> the necessary maintenance recommendations. I'm guessing spark plugs/wires
> but I could be wrong.
>
> Has anyone had a similar problem?
>
> Thanks,
> Bill
>
>
>

Re: 99 Cherokee Bucking Problem
 

My friend has a diesel 2500 Ram. I know this is a jeep home, but his truck
was doing the same thing and it ended up being the crank position sensor.
Check pricing. maybe it's a cheap garage or driveway fix.

All the best!!
Paul
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Wildman" <mjswildman@excite.com> wrote in message
news:do79b.342070$cF.103807@rwcrnsc53...
> Make sure your Dist cap and rotor are good, but also make sure your Crank
> Sensor is good. I had the same problem on my 93
> "Goomba" <Goomba99@yahoo.com> wrote in message
> news:3f64b17d$1@news-1.oit.umass.edu...
> > Hi,
> >
> > The past few weeks, I have noticed a sporadic bucking problem with my
1999
> 6
> > cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
> > vehicle performs normally. But sometimes when I need a little kick (an
> > example would be getting on the highway) the vehicle bucks a few times.
I
> > would have already brought it into the mechanic, but this doesn't happen
> all
> > the time (it is actually more noticable with a heavy load in the vehicle
> or
> > in warmer weather).
> >
> > I am using 87 octane (which the manual recommends) and have followed all
> of
> > the necessary maintenance recommendations. I'm guessing spark
plugs/wires
> > but I could be wrong.
> >
> > Has anyone had a similar problem?
> >
> > Thanks,
> > Bill
> >
> >
> >
>
>

Re: 99 Cherokee Bucking Problem
 

My friend has a diesel 2500 Ram. I know this is a jeep home, but his truck
was doing the same thing and it ended up being the crank position sensor.
Check pricing. maybe it's a cheap garage or driveway fix.

All the best!!
Paul
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Wildman" <mjswildman@excite.com> wrote in message
news:do79b.342070$cF.103807@rwcrnsc53...
> Make sure your Dist cap and rotor are good, but also make sure your Crank
> Sensor is good. I had the same problem on my 93
> "Goomba" <Goomba99@yahoo.com> wrote in message
> news:3f64b17d$1@news-1.oit.umass.edu...
> > Hi,
> >
> > The past few weeks, I have noticed a sporadic bucking problem with my
1999
> 6
> > cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard, the
> > vehicle performs normally. But sometimes when I need a little kick (an
> > example would be getting on the highway) the vehicle bucks a few times.
I
> > would have already brought it into the mechanic, but this doesn't happen
> all
> > the time (it is actually more noticable with a heavy load in the vehicle
> or
> > in warmer weather).
> >
> > I am using 87 octane (which the manual recommends) and have followed all
> of
> > the necessary maintenance recommendations. I'm guessing spark
plugs/wires
> > but I could be wrong.
> >
> > Has anyone had a similar problem?
> >
> > Thanks,
> > Bill
> >
> >
> >
>
>

Re: 99 Cherokee Bucking Problem
 

The driveway fix is a real PITA., the sensor lives on the tranny bell
housing and requires the use of multiple extensions and universals, a small
local garage might be a cheap alternative, but many times these small shops
will also want to change lots of other parts as well.

Snow...


"Paul Brogren" <pibrogren@msn.com> wrote in message
news:bk3cpp$oko8v$1@ID-190695.news.uni-berlin.de...
> My friend has a diesel 2500 Ram. I know this is a jeep home, but his
truck
> was doing the same thing and it ended up being the crank position sensor.
> Check pricing. maybe it's a cheap garage or driveway fix.
>
> All the best!!
> Paul
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Wildman" <mjswildman@excite.com> wrote in message
> news:do79b.342070$cF.103807@rwcrnsc53...
> > Make sure your Dist cap and rotor are good, but also make sure your
Crank
> > Sensor is good. I had the same problem on my 93
> > "Goomba" <Goomba99@yahoo.com> wrote in message
> > news:3f64b17d$1@news-1.oit.umass.edu...
> > > Hi,
> > >
> > > The past few weeks, I have noticed a sporadic bucking problem with my
> 1999
> > 6
> > > cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard,
the
> > > vehicle performs normally. But sometimes when I need a little kick
(an
> > > example would be getting on the highway) the vehicle bucks a few
times.
> I
> > > would have already brought it into the mechanic, but this doesn't
happen
> > all
> > > the time (it is actually more noticable with a heavy load in the
vehicle
> > or
> > > in warmer weather).
> > >
> > > I am using 87 octane (which the manual recommends) and have followed
all
> > of
> > > the necessary maintenance recommendations. I'm guessing spark
> plugs/wires
> > > but I could be wrong.
> > >
> > > Has anyone had a similar problem?
> > >
> > > Thanks,
> > > Bill
> > >
> > >
> > >
> >
> >
>
>

Re: 99 Cherokee Bucking Problem
 

The driveway fix is a real PITA., the sensor lives on the tranny bell
housing and requires the use of multiple extensions and universals, a small
local garage might be a cheap alternative, but many times these small shops
will also want to change lots of other parts as well.

Snow...


"Paul Brogren" <pibrogren@msn.com> wrote in message
news:bk3cpp$oko8v$1@ID-190695.news.uni-berlin.de...
> My friend has a diesel 2500 Ram. I know this is a jeep home, but his
truck
> was doing the same thing and it ended up being the crank position sensor.
> Check pricing. maybe it's a cheap garage or driveway fix.
>
> All the best!!
> Paul
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Wildman" <mjswildman@excite.com> wrote in message
> news:do79b.342070$cF.103807@rwcrnsc53...
> > Make sure your Dist cap and rotor are good, but also make sure your
Crank
> > Sensor is good. I had the same problem on my 93
> > "Goomba" <Goomba99@yahoo.com> wrote in message
> > news:3f64b17d$1@news-1.oit.umass.edu...
> > > Hi,
> > >
> > > The past few weeks, I have noticed a sporadic bucking problem with my
> 1999
> > 6
> > > cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard,
the
> > > vehicle performs normally. But sometimes when I need a little kick
(an
> > > example would be getting on the highway) the vehicle bucks a few
times.
> I
> > > would have already brought it into the mechanic, but this doesn't
happen
> > all
> > > the time (it is actually more noticable with a heavy load in the
vehicle
> > or
> > > in warmer weather).
> > >
> > > I am using 87 octane (which the manual recommends) and have followed
all
> > of
> > > the necessary maintenance recommendations. I'm guessing spark
> plugs/wires
> > > but I could be wrong.
> > >
> > > Has anyone had a similar problem?
> > >
> > > Thanks,
> > > Bill
> > >
> > >
> > >
> >
> >
>
>

Re: 99 Cherokee Bucking Problem
 

"Snow" <snowball_2004@msn.com> wrote in message news:<tmh9b.866$Ie5.147655@news20.bellglobal.com>. ..
> The driveway fix is a real PITA., the sensor lives on the tranny bell
> housing and requires the use of multiple extensions and universals, a small
> local garage might be a cheap alternative, but many times these small shops
> will also want to change lots of other parts as well.
>
> Snow...
>
>
> "Paul Brogren" <pibrogren@msn.com> wrote in message
> news:bk3cpp$oko8v$1@ID-190695.news.uni-berlin.de...
> > My friend has a diesel 2500 Ram. I know this is a jeep home, but his
> truck
> > was doing the same thing and it ended up being the crank position sensor.
> > Check pricing. maybe it's a cheap garage or driveway fix.
> >
> > All the best!!
> > Paul
> > --
> > Thanks Always !!!
> > Paul '75 CJ5 258
> > Vail, CO.
> > "Wildman" <mjswildman@excite.com> wrote in message
> > news:do79b.342070$cF.103807@rwcrnsc53...
> > > Make sure your Dist cap and rotor are good, but also make sure your
> Crank
> > > Sensor is good. I had the same problem on my 93
> > > "Goomba" <Goomba99@yahoo.com> wrote in message
> > > news:3f64b17d$1@news-1.oit.umass.edu...
> > > > Hi,
> > > >
> > > > The past few weeks, I have noticed a sporadic bucking problem with my
> 1999
> 6
> > > > cyl 4.0 Cherokee Sport. When I accelerate very slowly or very hard,
> the
> > > > vehicle performs normally. But sometimes when I need a little kick
> (an
> > > > example would be getting on the highway) the vehicle bucks a few
> times.
> I
> > > > would have already brought it into the mechanic, but this doesn't
> happen
> all
> > > > the time (it is actually more noticable with a heavy load in the
> vehicle
> or
> > > > in warmer weather).
> > > >
> > > > I am using 87 octane (which the manual recommends) and have followed
> all
> of
> > > > the necessary maintenance recommendations. I'm guessing spark
> plugs/wires
> > > > but I could be wrong.
> > > >
> > > > Has anyone had a similar problem?
> > > >
> > > > Thanks,
> > > > Bill



this magnetic sensor (CPS) has two bolts the bolt holes are sloppy so
you can adjust it
sometimes one side is fixed for tight fit and the upper is loose fit.
1- loosen the upper bolt and push the sensor , closer to the flywheel.
2- retighten and test drive. ( think like tuning a radio , cuz that
is what it is)
I used qty 2 , 12" 3/8's drive extensions to do it.

Jelly the gear head. (electronics tech and mech)
(posdmr--xxx@yahoo.com) remove the -xxx to send email if you like

The right side of the block has this ground stud and the ignition and
many things ground to this Meca ground. Some times it is loose , some
times (many) the Ignition ring lug was poorly crimped in the factory.
Flux, and Solder it and put it back for Great Spark.

good luck to one and all.