96 Grand Cherokee Stalling
 

I have a 96 Jeep Grand Cherokee Laredo, 6 cylinder, automatic with
about 160000 miles. Over the past several weeks, it has developed an
annoying habit of stalling. Initially, this only happened when stopped
at a traffic light or stop sign. It would begin to stumble and then
stall. If I shifted into neutral, and gave it some gas, it tended to
not have the problem. It wouldn't do this at every stop, and typically
only did it during the first 15 minutes of driving. When it stalls, it
will usually start back up right away, though sometimes I have to try
to start it 5 or 6 times before it will actually start.

More recently, it has began to stumble and hesitate briefly even at
highway speeds, though this is far more rare than the stalls when
stopped. Sometimes it will happen after pulling away from a stop: it
will stumble, cough and sputter, and if I give it some gas sometimes it
will recover and go on about its business. Needless to say, all these
stall outs in rush hour traffic can be pretty unnerving.

After reading about similiar problems with JGCs of this vintage, I've
tried the following:
1) Changed the ignition coil: This had no effect on the problem.
2) Changed the fuel filter: It ran great for about 35 miles, leading me
to think I'd solved the problem, then it stumbled and stalled in a
traffic stop, and misbehaved on and off for the next 5 to 10 minutes.
@#%$

I fear it's the fuel pump, but given that it usually starts back up
pretty quickly (i.e., a few tries) after stalling, I'm not sure. After
it has one of its coughing/sputtering/stumbling/stalling episodes, it
does set engine code 43.

I've read a lot about problems with bad CPS's. Any thoughts?

P.S. I'm taking it to the dealership on Wednesday morning to get the
PCM reprogrammed and my catalytic converter replaced under the recent
E22 emissions recall. My converter has been rattling around for over a
year. Nice of them to replace it for free. :-)

Thanks,
Doug

Re: 96 Grand Cherokee Stalling
 

Hi Doug,
You didn't mention the basic maintenance like spark plugs in the
last twenty thousand miles: http://www.----------.com/lubeSchedule.pdf
May be your throttle Position Sensors, and/or Idle Step Motor need
to be cleaned: http://members.cox.net/wilsond/tb/tb.html
God Bless America, Bill O|||||||O
mailto:--------------------

dougguitar@yahoo.com wrote:
>
> I have a 96 Jeep Grand Cherokee Laredo, 6 cylinder, automatic with
> about 160000 miles. Over the past several weeks, it has developed an
> annoying habit of stalling. Initially, this only happened when stopped
> at a traffic light or stop sign. It would begin to stumble and then
> stall. If I shifted into neutral, and gave it some gas, it tended to
> not have the problem. It wouldn't do this at every stop, and typically
> only did it during the first 15 minutes of driving. When it stalls, it
> will usually start back up right away, though sometimes I have to try
> to start it 5 or 6 times before it will actually start.
>
> More recently, it has began to stumble and hesitate briefly even at
> highway speeds, though this is far more rare than the stalls when
> stopped. Sometimes it will happen after pulling away from a stop: it
> will stumble, cough and sputter, and if I give it some gas sometimes it
> will recover and go on about its business. Needless to say, all these
> stall outs in rush hour traffic can be pretty unnerving.
>
> After reading about similiar problems with JGCs of this vintage, I've
> tried the following:
> 1) Changed the ignition coil: This had no effect on the problem.
> 2) Changed the fuel filter: It ran great for about 35 miles, leading me
> to think I'd solved the problem, then it stumbled and stalled in a
> traffic stop, and misbehaved on and off for the next 5 to 10 minutes.
> @#%$
>
> I fear it's the fuel pump, but given that it usually starts back up
> pretty quickly (i.e., a few tries) after stalling, I'm not sure. After
> it has one of its coughing/sputtering/stumbling/stalling episodes, it
> does set engine code 43.
>
> I've read a lot about problems with bad CPS's. Any thoughts?
>
> P.S. I'm taking it to the dealership on Wednesday morning to get the
> PCM reprogrammed and my catalytic converter replaced under the recent
> E22 emissions recall. My converter has been rattling around for over a
> year. Nice of them to replace it for free. :-)
>
> Thanks,
> Doug

Re: 96 Grand Cherokee Stalling
 

Hi Doug,
You didn't mention the basic maintenance like spark plugs in the
last twenty thousand miles: http://www.----------.com/lubeSchedule.pdf
May be your throttle Position Sensors, and/or Idle Step Motor need
to be cleaned: http://members.cox.net/wilsond/tb/tb.html
God Bless America, Bill O|||||||O
mailto:--------------------

dougguitar@yahoo.com wrote:
>
> I have a 96 Jeep Grand Cherokee Laredo, 6 cylinder, automatic with
> about 160000 miles. Over the past several weeks, it has developed an
> annoying habit of stalling. Initially, this only happened when stopped
> at a traffic light or stop sign. It would begin to stumble and then
> stall. If I shifted into neutral, and gave it some gas, it tended to
> not have the problem. It wouldn't do this at every stop, and typically
> only did it during the first 15 minutes of driving. When it stalls, it
> will usually start back up right away, though sometimes I have to try
> to start it 5 or 6 times before it will actually start.
>
> More recently, it has began to stumble and hesitate briefly even at
> highway speeds, though this is far more rare than the stalls when
> stopped. Sometimes it will happen after pulling away from a stop: it
> will stumble, cough and sputter, and if I give it some gas sometimes it
> will recover and go on about its business. Needless to say, all these
> stall outs in rush hour traffic can be pretty unnerving.
>
> After reading about similiar problems with JGCs of this vintage, I've
> tried the following:
> 1) Changed the ignition coil: This had no effect on the problem.
> 2) Changed the fuel filter: It ran great for about 35 miles, leading me
> to think I'd solved the problem, then it stumbled and stalled in a
> traffic stop, and misbehaved on and off for the next 5 to 10 minutes.
> @#%$
>
> I fear it's the fuel pump, but given that it usually starts back up
> pretty quickly (i.e., a few tries) after stalling, I'm not sure. After
> it has one of its coughing/sputtering/stumbling/stalling episodes, it
> does set engine code 43.
>
> I've read a lot about problems with bad CPS's. Any thoughts?
>
> P.S. I'm taking it to the dealership on Wednesday morning to get the
> PCM reprogrammed and my catalytic converter replaced under the recent
> E22 emissions recall. My converter has been rattling around for over a
> year. Nice of them to replace it for free. :-)
>
> Thanks,
> Doug

Re: 96 Grand Cherokee Stalling
 

Hi Doug,
You didn't mention the basic maintenance like spark plugs in the
last twenty thousand miles: http://www.----------.com/lubeSchedule.pdf
May be your throttle Position Sensors, and/or Idle Step Motor need
to be cleaned: http://members.cox.net/wilsond/tb/tb.html
God Bless America, Bill O|||||||O
mailto:--------------------

dougguitar@yahoo.com wrote:
>
> I have a 96 Jeep Grand Cherokee Laredo, 6 cylinder, automatic with
> about 160000 miles. Over the past several weeks, it has developed an
> annoying habit of stalling. Initially, this only happened when stopped
> at a traffic light or stop sign. It would begin to stumble and then
> stall. If I shifted into neutral, and gave it some gas, it tended to
> not have the problem. It wouldn't do this at every stop, and typically
> only did it during the first 15 minutes of driving. When it stalls, it
> will usually start back up right away, though sometimes I have to try
> to start it 5 or 6 times before it will actually start.
>
> More recently, it has began to stumble and hesitate briefly even at
> highway speeds, though this is far more rare than the stalls when
> stopped. Sometimes it will happen after pulling away from a stop: it
> will stumble, cough and sputter, and if I give it some gas sometimes it
> will recover and go on about its business. Needless to say, all these
> stall outs in rush hour traffic can be pretty unnerving.
>
> After reading about similiar problems with JGCs of this vintage, I've
> tried the following:
> 1) Changed the ignition coil: This had no effect on the problem.
> 2) Changed the fuel filter: It ran great for about 35 miles, leading me
> to think I'd solved the problem, then it stumbled and stalled in a
> traffic stop, and misbehaved on and off for the next 5 to 10 minutes.
> @#%$
>
> I fear it's the fuel pump, but given that it usually starts back up
> pretty quickly (i.e., a few tries) after stalling, I'm not sure. After
> it has one of its coughing/sputtering/stumbling/stalling episodes, it
> does set engine code 43.
>
> I've read a lot about problems with bad CPS's. Any thoughts?
>
> P.S. I'm taking it to the dealership on Wednesday morning to get the
> PCM reprogrammed and my catalytic converter replaced under the recent
> E22 emissions recall. My converter has been rattling around for over a
> year. Nice of them to replace it for free. :-)
>
> Thanks,
> Doug

Re: 96 Grand Cherokee Stalling
 

Hi Bill,
Well, the spark plugs are certainly "vintage". But given the
intermittent nature of my problem, and the fact that it can also happen
to some degree at highway speeds, would you think the plugs and/or a
dirty throttle body would be the root cause? I'll certainly try
dropping in some new plugs and cleaning the throttle body. Can't hurt.

Thanks,
Doug

Re: 96 Grand Cherokee Stalling
 

Hi Bill,
Well, the spark plugs are certainly "vintage". But given the
intermittent nature of my problem, and the fact that it can also happen
to some degree at highway speeds, would you think the plugs and/or a
dirty throttle body would be the root cause? I'll certainly try
dropping in some new plugs and cleaning the throttle body. Can't hurt.

Thanks,
Doug

Re: 96 Grand Cherokee Stalling
 

Hi Bill,
Well, the spark plugs are certainly "vintage". But given the
intermittent nature of my problem, and the fact that it can also happen
to some degree at highway speeds, would you think the plugs and/or a
dirty throttle body would be the root cause? I'll certainly try
dropping in some new plugs and cleaning the throttle body. Can't hurt.

Thanks,
Doug

Re: 96 Grand Cherokee Stalling
 

Bad plugs will bark back through the intake destroying the step
motor and any vacuum diaphragms.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

dougguitar@yahoo.com wrote:
>
> Hi Bill,
> Well, the spark plugs are certainly "vintage". But given the
> intermittent nature of my problem, and the fact that it can also happen
> to some degree at highway speeds, would you think the plugs and/or a
> dirty throttle body would be the root cause? I'll certainly try
> dropping in some new plugs and cleaning the throttle body. Can't hurt.
>
> Thanks,
> Doug

Re: 96 Grand Cherokee Stalling
 

Bad plugs will bark back through the intake destroying the step
motor and any vacuum diaphragms.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

dougguitar@yahoo.com wrote:
>
> Hi Bill,
> Well, the spark plugs are certainly "vintage". But given the
> intermittent nature of my problem, and the fact that it can also happen
> to some degree at highway speeds, would you think the plugs and/or a
> dirty throttle body would be the root cause? I'll certainly try
> dropping in some new plugs and cleaning the throttle body. Can't hurt.
>
> Thanks,
> Doug

Re: 96 Grand Cherokee Stalling
 

Bad plugs will bark back through the intake destroying the step
motor and any vacuum diaphragms.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

dougguitar@yahoo.com wrote:
>
> Hi Bill,
> Well, the spark plugs are certainly "vintage". But given the
> intermittent nature of my problem, and the fact that it can also happen
> to some degree at highway speeds, would you think the plugs and/or a
> dirty throttle body would be the root cause? I'll certainly try
> dropping in some new plugs and cleaning the throttle body. Can't hurt.
>
> Thanks,
> Doug