2003 Jeep Grand Cherokee bucking at interstate speeds
 

I have a 2003 Jeep Grand Cherokee that misfires really bad when
certain conditions exsist. I know that if I accelerate going up a
steep hill - the motor misfires so bad that it is like a bucking
horse.

I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
and replaced it, after numerous attempts to fix the problem, and now
the 2nd Jeep does the SAME EXACT THING.

My dealership tells me that Jeep Hot Line doesn't have any reports
about this problem from anyone else. My dealership is going to put a
co-pilot on my Jeep to get better computer codes. All they know is
that there is a misfire. And as luck would have it - the mechanic can
not reproduce the problem.

The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
miles when I got swapped it out for a different Jeep. This 2nd Jeep
was brand new as well and at 23,000 miles at the same exact location
as one of the previous misfires, it started misfiring. I
was going 55 mph about 100 miles from home on my way to a relative's
house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
The
car has had gas from various gas stations during the misfires so I
don't
think the problem is specific to the gasoline that it is using. But
in this case I had bought gas (filled up) at a Shell station about 50
miles before the misfire.

Most recently, I was going up a hill on the interstate trying to pass
a semi and when it kicked into passing gear -bingo, it started
misfiring so bad I had
to pull over.

After turning off the Jeep for about 15 minutes, I restarted the Jeep
it ran smoothly but the check engine light was on.

It does not matter if it is cold or warm out. It does not matter if I
have gone 1 mile or 100 miles - the only consistent thing that I can
find is that both vehicles are 2003 Jeep Grand Cherokees and that I
was either accelerating or on a highway at highway speeds.

The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
Jeep, the dealership reset the magentic pickup - then replaced it -
then gave up.

Thanks in advance so much for suggestions and help.

Pat

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

Pat did pass the time by typing:
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.

few ideas.

What your describing almost sounds like detonation.
First try a higher octane gas and see if that helps.

Your fuel pressure could also be low.

----

Don't believe you have sparkplug wires, or the rest but
on older vehicles it can be caused by ignition crossfire
bad sparkplug/wire/cracked cap/rotor.
You could have a faulty harness or bad coil.

failing injector or bad harness
(take the plug off the injector, and measure the injector
with an Ommeter. You should get about 15.5 Ohm +- 1.5 Ohm.)


That's all I can think off off the top o me head.


--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

Pat did pass the time by typing:
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.

few ideas.

What your describing almost sounds like detonation.
First try a higher octane gas and see if that helps.

Your fuel pressure could also be low.

----

Don't believe you have sparkplug wires, or the rest but
on older vehicles it can be caused by ignition crossfire
bad sparkplug/wire/cracked cap/rotor.
You could have a faulty harness or bad coil.

failing injector or bad harness
(take the plug off the injector, and measure the injector
with an Ommeter. You should get about 15.5 Ohm +- 1.5 Ohm.)


That's all I can think off off the top o me head.


--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

Pat did pass the time by typing:
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.

few ideas.

What your describing almost sounds like detonation.
First try a higher octane gas and see if that helps.

Your fuel pressure could also be low.

----

Don't believe you have sparkplug wires, or the rest but
on older vehicles it can be caused by ignition crossfire
bad sparkplug/wire/cracked cap/rotor.
You could have a faulty harness or bad coil.

failing injector or bad harness
(take the plug off the injector, and measure the injector
with an Ommeter. You should get about 15.5 Ohm +- 1.5 Ohm.)


That's all I can think off off the top o me head.


--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

Take it to your Stealership.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Pat wrote:
>
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.
>
> I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
> and replaced it, after numerous attempts to fix the problem, and now
> the 2nd Jeep does the SAME EXACT THING.
>
> My dealership tells me that Jeep Hot Line doesn't have any reports
> about this problem from anyone else. My dealership is going to put a
> co-pilot on my Jeep to get better computer codes. All they know is
> that there is a misfire. And as luck would have it - the mechanic can
> not reproduce the problem.
>
> The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
> miles when I got swapped it out for a different Jeep. This 2nd Jeep
> was brand new as well and at 23,000 miles at the same exact location
> as one of the previous misfires, it started misfiring. I
> was going 55 mph about 100 miles from home on my way to a relative's
> house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
> The
> car has had gas from various gas stations during the misfires so I
> don't
> think the problem is specific to the gasoline that it is using. But
> in this case I had bought gas (filled up) at a Shell station about 50
> miles before the misfire.
>
> Most recently, I was going up a hill on the interstate trying to pass
> a semi and when it kicked into passing gear -bingo, it started
> misfiring so bad I had
> to pull over.
>
> After turning off the Jeep for about 15 minutes, I restarted the Jeep
> it ran smoothly but the check engine light was on.
>
> It does not matter if it is cold or warm out. It does not matter if I
> have gone 1 mile or 100 miles - the only consistent thing that I can
> find is that both vehicles are 2003 Jeep Grand Cherokees and that I
> was either accelerating or on a highway at highway speeds.
>
> The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
> Jeep, the dealership reset the magentic pickup - then replaced it -
> then gave up.
>
> Thanks in advance so much for suggestions and help.
>
> Pat

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

Take it to your Stealership.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Pat wrote:
>
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.
>
> I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
> and replaced it, after numerous attempts to fix the problem, and now
> the 2nd Jeep does the SAME EXACT THING.
>
> My dealership tells me that Jeep Hot Line doesn't have any reports
> about this problem from anyone else. My dealership is going to put a
> co-pilot on my Jeep to get better computer codes. All they know is
> that there is a misfire. And as luck would have it - the mechanic can
> not reproduce the problem.
>
> The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
> miles when I got swapped it out for a different Jeep. This 2nd Jeep
> was brand new as well and at 23,000 miles at the same exact location
> as one of the previous misfires, it started misfiring. I
> was going 55 mph about 100 miles from home on my way to a relative's
> house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
> The
> car has had gas from various gas stations during the misfires so I
> don't
> think the problem is specific to the gasoline that it is using. But
> in this case I had bought gas (filled up) at a Shell station about 50
> miles before the misfire.
>
> Most recently, I was going up a hill on the interstate trying to pass
> a semi and when it kicked into passing gear -bingo, it started
> misfiring so bad I had
> to pull over.
>
> After turning off the Jeep for about 15 minutes, I restarted the Jeep
> it ran smoothly but the check engine light was on.
>
> It does not matter if it is cold or warm out. It does not matter if I
> have gone 1 mile or 100 miles - the only consistent thing that I can
> find is that both vehicles are 2003 Jeep Grand Cherokees and that I
> was either accelerating or on a highway at highway speeds.
>
> The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
> Jeep, the dealership reset the magentic pickup - then replaced it -
> then gave up.
>
> Thanks in advance so much for suggestions and help.
>
> Pat

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

Take it to your Stealership.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Pat wrote:
>
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.
>
> I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
> and replaced it, after numerous attempts to fix the problem, and now
> the 2nd Jeep does the SAME EXACT THING.
>
> My dealership tells me that Jeep Hot Line doesn't have any reports
> about this problem from anyone else. My dealership is going to put a
> co-pilot on my Jeep to get better computer codes. All they know is
> that there is a misfire. And as luck would have it - the mechanic can
> not reproduce the problem.
>
> The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
> miles when I got swapped it out for a different Jeep. This 2nd Jeep
> was brand new as well and at 23,000 miles at the same exact location
> as one of the previous misfires, it started misfiring. I
> was going 55 mph about 100 miles from home on my way to a relative's
> house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
> The
> car has had gas from various gas stations during the misfires so I
> don't
> think the problem is specific to the gasoline that it is using. But
> in this case I had bought gas (filled up) at a Shell station about 50
> miles before the misfire.
>
> Most recently, I was going up a hill on the interstate trying to pass
> a semi and when it kicked into passing gear -bingo, it started
> misfiring so bad I had
> to pull over.
>
> After turning off the Jeep for about 15 minutes, I restarted the Jeep
> it ran smoothly but the check engine light was on.
>
> It does not matter if it is cold or warm out. It does not matter if I
> have gone 1 mile or 100 miles - the only consistent thing that I can
> find is that both vehicles are 2003 Jeep Grand Cherokees and that I
> was either accelerating or on a highway at highway speeds.
>
> The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
> Jeep, the dealership reset the magentic pickup - then replaced it -
> then gave up.
>
> Thanks in advance so much for suggestions and help.
>
> Pat

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

More details please, where do you live? Type of fuel? octane?
"Pat" <pat@nebraskaruralweb.com> wrote in message
news:78db4679.0401300617.10547938@posting.google.c om...
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.
>
> I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
> and replaced it, after numerous attempts to fix the problem, and now
> the 2nd Jeep does the SAME EXACT THING.
>
> My dealership tells me that Jeep Hot Line doesn't have any reports
> about this problem from anyone else. My dealership is going to put a
> co-pilot on my Jeep to get better computer codes. All they know is
> that there is a misfire. And as luck would have it - the mechanic can
> not reproduce the problem.
>
> The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
> miles when I got swapped it out for a different Jeep. This 2nd Jeep
> was brand new as well and at 23,000 miles at the same exact location
> as one of the previous misfires, it started misfiring. I
> was going 55 mph about 100 miles from home on my way to a relative's
> house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
> The
> car has had gas from various gas stations during the misfires so I
> don't
> think the problem is specific to the gasoline that it is using. But
> in this case I had bought gas (filled up) at a Shell station about 50
> miles before the misfire.
>
> Most recently, I was going up a hill on the interstate trying to pass
> a semi and when it kicked into passing gear -bingo, it started
> misfiring so bad I had
> to pull over.
>
> After turning off the Jeep for about 15 minutes, I restarted the Jeep
> it ran smoothly but the check engine light was on.
>
> It does not matter if it is cold or warm out. It does not matter if I
> have gone 1 mile or 100 miles - the only consistent thing that I can
> find is that both vehicles are 2003 Jeep Grand Cherokees and that I
> was either accelerating or on a highway at highway speeds.
>
> The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
> Jeep, the dealership reset the magentic pickup - then replaced it -
> then gave up.
>
> Thanks in advance so much for suggestions and help.
>
> Pat

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

More details please, where do you live? Type of fuel? octane?
"Pat" <pat@nebraskaruralweb.com> wrote in message
news:78db4679.0401300617.10547938@posting.google.c om...
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.
>
> I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
> and replaced it, after numerous attempts to fix the problem, and now
> the 2nd Jeep does the SAME EXACT THING.
>
> My dealership tells me that Jeep Hot Line doesn't have any reports
> about this problem from anyone else. My dealership is going to put a
> co-pilot on my Jeep to get better computer codes. All they know is
> that there is a misfire. And as luck would have it - the mechanic can
> not reproduce the problem.
>
> The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
> miles when I got swapped it out for a different Jeep. This 2nd Jeep
> was brand new as well and at 23,000 miles at the same exact location
> as one of the previous misfires, it started misfiring. I
> was going 55 mph about 100 miles from home on my way to a relative's
> house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
> The
> car has had gas from various gas stations during the misfires so I
> don't
> think the problem is specific to the gasoline that it is using. But
> in this case I had bought gas (filled up) at a Shell station about 50
> miles before the misfire.
>
> Most recently, I was going up a hill on the interstate trying to pass
> a semi and when it kicked into passing gear -bingo, it started
> misfiring so bad I had
> to pull over.
>
> After turning off the Jeep for about 15 minutes, I restarted the Jeep
> it ran smoothly but the check engine light was on.
>
> It does not matter if it is cold or warm out. It does not matter if I
> have gone 1 mile or 100 miles - the only consistent thing that I can
> find is that both vehicles are 2003 Jeep Grand Cherokees and that I
> was either accelerating or on a highway at highway speeds.
>
> The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
> Jeep, the dealership reset the magentic pickup - then replaced it -
> then gave up.
>
> Thanks in advance so much for suggestions and help.
>
> Pat

Re: 2003 Jeep Grand Cherokee bucking at interstate speeds
 

More details please, where do you live? Type of fuel? octane?
"Pat" <pat@nebraskaruralweb.com> wrote in message
news:78db4679.0401300617.10547938@posting.google.c om...
> I have a 2003 Jeep Grand Cherokee that misfires really bad when
> certain conditions exsist. I know that if I accelerate going up a
> steep hill - the motor misfires so bad that it is like a bucking
> horse.
>
> I have had 2 of these Jeeps. The dealer called my 1st Jeep a lemon
> and replaced it, after numerous attempts to fix the problem, and now
> the 2nd Jeep does the SAME EXACT THING.
>
> My dealership tells me that Jeep Hot Line doesn't have any reports
> about this problem from anyone else. My dealership is going to put a
> co-pilot on my Jeep to get better computer codes. All they know is
> that there is a misfire. And as luck would have it - the mechanic can
> not reproduce the problem.
>
> The 1st Jeep did this 3 times beginning at 3,000 miles until 10,000
> miles when I got swapped it out for a different Jeep. This 2nd Jeep
> was brand new as well and at 23,000 miles at the same exact location
> as one of the previous misfires, it started misfiring. I
> was going 55 mph about 100 miles from home on my way to a relative's
> house. The first Jeep did the EXACT SAME THING in the SAME LOCATION.
> The
> car has had gas from various gas stations during the misfires so I
> don't
> think the problem is specific to the gasoline that it is using. But
> in this case I had bought gas (filled up) at a Shell station about 50
> miles before the misfire.
>
> Most recently, I was going up a hill on the interstate trying to pass
> a semi and when it kicked into passing gear -bingo, it started
> misfiring so bad I had
> to pull over.
>
> After turning off the Jeep for about 15 minutes, I restarted the Jeep
> it ran smoothly but the check engine light was on.
>
> It does not matter if it is cold or warm out. It does not matter if I
> have gone 1 mile or 100 miles - the only consistent thing that I can
> find is that both vehicles are 2003 Jeep Grand Cherokees and that I
> was either accelerating or on a highway at highway speeds.
>
> The Jeep is a 6 cyclinder Jeep Grand Cherokee Laredo. On the 1st
> Jeep, the dealership reset the magentic pickup - then replaced it -
> then gave up.
>
> Thanks in advance so much for suggestions and help.
>
> Pat