I have a 1987 4speed automatic cherokee that won't down shift to passing
gear and if I take off to fast it bogs down and make a strange thumping
noise. If I take of at a normal speed it shifts ok and I can get on the
highway and go but again if I try to pass someone on the highway it won't
down shift. The car had the heads and fuel pump replaced any ideas what
could be wrong? BTW this car has the shift performance switch and it doesn't
make any difference what position it is in.

Thanks,

Ed.

 

Hi Ed,
You do not have a kick-down rod, or cable like most normal Real
cars do. It's all computer controlled, a part that could effect the
computers sensors could be the Throttle Position Sensor:
http://members.***.net/wilsond/tb/tb.html Clean it and it's connections.
Same transmission under Japanese name and maker:
http://www.transonline.com/transdige...ers/index.html
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

mrconductor wrote:
>
> I have a 1987 4speed automatic cherokee that won't down shift to passing
> gear and if I take off to fast it bogs down and make a strange thumping
> noise. If I take of at a normal speed it shifts ok and I can get on the
> highway and go but again if I try to pass someone on the highway it won't
> down shift. The car had the heads and fuel pump replaced any ideas what
> could be wrong? BTW this car has the shift performance switch and it doesn't
> make any difference what position it is in.
>
> Thanks,
>
> Ed.

 

Hi Ed,
You do not have a kick-down rod, or cable like most normal Real
cars do. It's all computer controlled, a part that could effect the
computers sensors could be the Throttle Position Sensor:
http://members.***.net/wilsond/tb/tb.html Clean it and it's connections.
Same transmission under Japanese name and maker:
http://www.transonline.com/transdige...ers/index.html
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

mrconductor wrote:
>
> I have a 1987 4speed automatic cherokee that won't down shift to passing
> gear and if I take off to fast it bogs down and make a strange thumping
> noise. If I take of at a normal speed it shifts ok and I can get on the
> highway and go but again if I try to pass someone on the highway it won't
> down shift. The car had the heads and fuel pump replaced any ideas what
> could be wrong? BTW this car has the shift performance switch and it doesn't
> make any difference what position it is in.
>
> Thanks,
>
> Ed.

 

Hi Ed,
You do not have a kick-down rod, or cable like most normal Real
cars do. It's all computer controlled, a part that could effect the
computers sensors could be the Throttle Position Sensor:
http://members.***.net/wilsond/tb/tb.html Clean it and it's connections.
Same transmission under Japanese name and maker:
http://www.transonline.com/transdige...ers/index.html
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

mrconductor wrote:
>
> I have a 1987 4speed automatic cherokee that won't down shift to passing
> gear and if I take off to fast it bogs down and make a strange thumping
> noise. If I take of at a normal speed it shifts ok and I can get on the
> highway and go but again if I try to pass someone on the highway it won't
> down shift. The car had the heads and fuel pump replaced any ideas what
> could be wrong? BTW this car has the shift performance switch and it doesn't
> make any difference what position it is in.
>
> Thanks,
>
> Ed.

 

Doesn't it have that throttle cable going to the transmission? TV Cable?
It might be out of adjustment or not connected maybe? Real easy to adjust!
;-)

AW-4 Transmission TV Cable Adjustment:

Shift the transmission in park and make sure the ignition is in the off
position. Depress the cable release button, then push the cable conduit back
into the sheath as far as it will go.
Rotate the throttle lever on the throttle body to the wide open throtle
position. The cable will ratchet to the correct adjustment point as the
lever is rotated. Release the throttle lever.

You also have to make sure that you can achieve WOT when you step on the gas
pedal.

Maybe the electrical connections are dirty at the transmission?

thumping sound might be a failing engine/trans mount and maybe a stiff
U-Joint on a driveshaft?
Check to see if any of the driveshafts have hit something and made it shiny
or bent.

--
later,
dave AKA vwdoc1


"L.W.(Bill) ------ III" <----------@***.net> wrote in message
news:449871D3.89321197@***.net...
> Hi Ed,
> You do not have a kick-down rod, or cable like most normal Real
> cars do. It's all computer controlled, a part that could effect the
> computers sensors could be the Throttle Position Sensor:
> http://members.***.net/wilsond/tb/tb.html Clean it and it's connections.
> Same transmission under Japanese name and maker:
> http://www.transonline.com/transdige...ers/index.html
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> mrconductor wrote:
>>
>> I have a 1987 4speed automatic cherokee that won't down shift to passing
>> gear and if I take off to fast it bogs down and make a strange thumping
>> noise. If I take of at a normal speed it shifts ok and I can get on the
>> highway and go but again if I try to pass someone on the highway it won't
>> down shift. The car had the heads and fuel pump replaced any ideas what
>> could be wrong? BTW this car has the shift performance switch and it
>> doesn't
>> make any difference what position it is in.
>>
>> Thanks,
>>
>> Ed.

 

Doesn't it have that throttle cable going to the transmission? TV Cable?
It might be out of adjustment or not connected maybe? Real easy to adjust!
;-)

AW-4 Transmission TV Cable Adjustment:

Shift the transmission in park and make sure the ignition is in the off
position. Depress the cable release button, then push the cable conduit back
into the sheath as far as it will go.
Rotate the throttle lever on the throttle body to the wide open throtle
position. The cable will ratchet to the correct adjustment point as the
lever is rotated. Release the throttle lever.

You also have to make sure that you can achieve WOT when you step on the gas
pedal.

Maybe the electrical connections are dirty at the transmission?

thumping sound might be a failing engine/trans mount and maybe a stiff
U-Joint on a driveshaft?
Check to see if any of the driveshafts have hit something and made it shiny
or bent.

--
later,
dave AKA vwdoc1


"L.W.(Bill) ------ III" <----------@***.net> wrote in message
news:449871D3.89321197@***.net...
> Hi Ed,
> You do not have a kick-down rod, or cable like most normal Real
> cars do. It's all computer controlled, a part that could effect the
> computers sensors could be the Throttle Position Sensor:
> http://members.***.net/wilsond/tb/tb.html Clean it and it's connections.
> Same transmission under Japanese name and maker:
> http://www.transonline.com/transdige...ers/index.html
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> mrconductor wrote:
>>
>> I have a 1987 4speed automatic cherokee that won't down shift to passing
>> gear and if I take off to fast it bogs down and make a strange thumping
>> noise. If I take of at a normal speed it shifts ok and I can get on the
>> highway and go but again if I try to pass someone on the highway it won't
>> down shift. The car had the heads and fuel pump replaced any ideas what
>> could be wrong? BTW this car has the shift performance switch and it
>> doesn't
>> make any difference what position it is in.
>>
>> Thanks,
>>
>> Ed.

 

Doesn't it have that throttle cable going to the transmission? TV Cable?
It might be out of adjustment or not connected maybe? Real easy to adjust!
;-)

AW-4 Transmission TV Cable Adjustment:

Shift the transmission in park and make sure the ignition is in the off
position. Depress the cable release button, then push the cable conduit back
into the sheath as far as it will go.
Rotate the throttle lever on the throttle body to the wide open throtle
position. The cable will ratchet to the correct adjustment point as the
lever is rotated. Release the throttle lever.

You also have to make sure that you can achieve WOT when you step on the gas
pedal.

Maybe the electrical connections are dirty at the transmission?

thumping sound might be a failing engine/trans mount and maybe a stiff
U-Joint on a driveshaft?
Check to see if any of the driveshafts have hit something and made it shiny
or bent.

--
later,
dave AKA vwdoc1


"L.W.(Bill) ------ III" <----------@***.net> wrote in message
news:449871D3.89321197@***.net...
> Hi Ed,
> You do not have a kick-down rod, or cable like most normal Real
> cars do. It's all computer controlled, a part that could effect the
> computers sensors could be the Throttle Position Sensor:
> http://members.***.net/wilsond/tb/tb.html Clean it and it's connections.
> Same transmission under Japanese name and maker:
> http://www.transonline.com/transdige...ers/index.html
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> mrconductor wrote:
>>
>> I have a 1987 4speed automatic cherokee that won't down shift to passing
>> gear and if I take off to fast it bogs down and make a strange thumping
>> noise. If I take of at a normal speed it shifts ok and I can get on the
>> highway and go but again if I try to pass someone on the highway it won't
>> down shift. The car had the heads and fuel pump replaced any ideas what
>> could be wrong? BTW this car has the shift performance switch and it
>> doesn't
>> make any difference what position it is in.
>>
>> Thanks,
>>
>> Ed.