Ground strap is verified, brake wires are solid.....
? ? ?

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
> paul wrote:
>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>
>> thanks
>> paul
> Just FYI, if the ground strap that runs from the rear of the engine head
> up to the firewall goes punky, it will cause a computer failure.
>
> So can the recall on the emergency brake if they forget to hook up one
> wire onto the bolt there.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

 

Some folks have been told their ECM is dead after getting the emergency
brake recall done. There is a wire there on a bolt that is the ground
for the fuel pump and if the 'tech' doesn't know about it, it can be
left off and nothing they can do will make the pump work so they think
the main ECM is dead.

The other grounds for the ECM are near the oil dipstick bolted onto the
block.

It is a bit unusual to hear of a dead computer in a YJ...

Mike

paul wrote:
> Ground strap is verified, brake wires are solid.....
> ? ? ?
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>> paul wrote:
>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>
>>> thanks
>>> paul
>> Just FYI, if the ground strap that runs from the rear of the engine head
>> up to the firewall goes punky, it will cause a computer failure.
>>
>> So can the recall on the emergency brake if they forget to hook up one
>> wire onto the bolt there.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>
>

 

Some folks have been told their ECM is dead after getting the emergency
brake recall done. There is a wire there on a bolt that is the ground
for the fuel pump and if the 'tech' doesn't know about it, it can be
left off and nothing they can do will make the pump work so they think
the main ECM is dead.

The other grounds for the ECM are near the oil dipstick bolted onto the
block.

It is a bit unusual to hear of a dead computer in a YJ...

Mike

paul wrote:
> Ground strap is verified, brake wires are solid.....
> ? ? ?
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>> paul wrote:
>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>
>>> thanks
>>> paul
>> Just FYI, if the ground strap that runs from the rear of the engine head
>> up to the firewall goes punky, it will cause a computer failure.
>>
>> So can the recall on the emergency brake if they forget to hook up one
>> wire onto the bolt there.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>
>

 

Some folks have been told their ECM is dead after getting the emergency
brake recall done. There is a wire there on a bolt that is the ground
for the fuel pump and if the 'tech' doesn't know about it, it can be
left off and nothing they can do will make the pump work so they think
the main ECM is dead.

The other grounds for the ECM are near the oil dipstick bolted onto the
block.

It is a bit unusual to hear of a dead computer in a YJ...

Mike

paul wrote:
> Ground strap is verified, brake wires are solid.....
> ? ? ?
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>> paul wrote:
>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>
>>> thanks
>>> paul
>> Just FYI, if the ground strap that runs from the rear of the engine head
>> up to the firewall goes punky, it will cause a computer failure.
>>
>> So can the recall on the emergency brake if they forget to hook up one
>> wire onto the bolt there.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>
>

 

Some folks have been told their ECM is dead after getting the emergency
brake recall done. There is a wire there on a bolt that is the ground
for the fuel pump and if the 'tech' doesn't know about it, it can be
left off and nothing they can do will make the pump work so they think
the main ECM is dead.

The other grounds for the ECM are near the oil dipstick bolted onto the
block.

It is a bit unusual to hear of a dead computer in a YJ...

Mike

paul wrote:
> Ground strap is verified, brake wires are solid.....
> ? ? ?
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>> paul wrote:
>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>
>>> thanks
>>> paul
>> Just FYI, if the ground strap that runs from the rear of the engine head
>> up to the firewall goes punky, it will cause a computer failure.
>>
>> So can the recall on the emergency brake if they forget to hook up one
>> wire onto the bolt there.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>
>

 

Well - this is all related to an "assumed" tranny problem, after having much
work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
claimed a spark or vacuum problem. I changed plugs, wires, cap, rotor, and
even the ignition coil. no improvement. Went to a recommended service shop -
they told me that the crack in the exhaust manifold was causing the O2
sensor to mis-read and this created the tranny shifting problem --- well -
after replacing the manifold there is no improvement in performance:
From dead stop - full throttle the vehicle is slow (I6 4.0 3.07 gears - it
should be like a rocket) remaining at full throttle it will wind up and not
change gears unless foot is let off throttle. Then at highway speeds when
trying to pass it used to rev up to 3500 rpm's with no drive train
response - now (after second visit to tranny shop) it will not go over 60
mph on the freeway and rpm's remain constant (although if I put it in
neutral it will rev up).

So the service shop is guesstimating that the computer is bad - but finding
one is proving difficult - the service shop is continuing diagnosis to see
if they can verify the computer is faulty......

thanks
paul

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4631fc30$0$21782$9a6e19ea@unlimited.newshosti ng.com...
> Some folks have been told their ECM is dead after getting the emergency
> brake recall done. There is a wire there on a bolt that is the ground for
> the fuel pump and if the 'tech' doesn't know about it, it can be left off
> and nothing they can do will make the pump work so they think the main ECM
> is dead.
>
> The other grounds for the ECM are near the oil dipstick bolted onto the
> block.
>
> It is a bit unusual to hear of a dead computer in a YJ...
>
> Mike
>
> paul wrote:
>> Ground strap is verified, brake wires are solid.....
>> ? ? ?
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>>> paul wrote:
>>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>>
>>>> thanks
>>>> paul
>>> Just FYI, if the ground strap that runs from the rear of the engine head
>>> up to the firewall goes punky, it will cause a computer failure.
>>>
>>> So can the recall on the emergency brake if they forget to hook up one
>>> wire onto the bolt there.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>> Canadian Off Road Trips Photos: Non members can still view!
>>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>> (More Off Road album links at bottom of the view page)
>>

 

Well - this is all related to an "assumed" tranny problem, after having much
work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
claimed a spark or vacuum problem. I changed plugs, wires, cap, rotor, and
even the ignition coil. no improvement. Went to a recommended service shop -
they told me that the crack in the exhaust manifold was causing the O2
sensor to mis-read and this created the tranny shifting problem --- well -
after replacing the manifold there is no improvement in performance:
From dead stop - full throttle the vehicle is slow (I6 4.0 3.07 gears - it
should be like a rocket) remaining at full throttle it will wind up and not
change gears unless foot is let off throttle. Then at highway speeds when
trying to pass it used to rev up to 3500 rpm's with no drive train
response - now (after second visit to tranny shop) it will not go over 60
mph on the freeway and rpm's remain constant (although if I put it in
neutral it will rev up).

So the service shop is guesstimating that the computer is bad - but finding
one is proving difficult - the service shop is continuing diagnosis to see
if they can verify the computer is faulty......

thanks
paul

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4631fc30$0$21782$9a6e19ea@unlimited.newshosti ng.com...
> Some folks have been told their ECM is dead after getting the emergency
> brake recall done. There is a wire there on a bolt that is the ground for
> the fuel pump and if the 'tech' doesn't know about it, it can be left off
> and nothing they can do will make the pump work so they think the main ECM
> is dead.
>
> The other grounds for the ECM are near the oil dipstick bolted onto the
> block.
>
> It is a bit unusual to hear of a dead computer in a YJ...
>
> Mike
>
> paul wrote:
>> Ground strap is verified, brake wires are solid.....
>> ? ? ?
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>>> paul wrote:
>>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>>
>>>> thanks
>>>> paul
>>> Just FYI, if the ground strap that runs from the rear of the engine head
>>> up to the firewall goes punky, it will cause a computer failure.
>>>
>>> So can the recall on the emergency brake if they forget to hook up one
>>> wire onto the bolt there.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>> Canadian Off Road Trips Photos: Non members can still view!
>>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>> (More Off Road album links at bottom of the view page)
>>

 

Well - this is all related to an "assumed" tranny problem, after having much
work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
claimed a spark or vacuum problem. I changed plugs, wires, cap, rotor, and
even the ignition coil. no improvement. Went to a recommended service shop -
they told me that the crack in the exhaust manifold was causing the O2
sensor to mis-read and this created the tranny shifting problem --- well -
after replacing the manifold there is no improvement in performance:
From dead stop - full throttle the vehicle is slow (I6 4.0 3.07 gears - it
should be like a rocket) remaining at full throttle it will wind up and not
change gears unless foot is let off throttle. Then at highway speeds when
trying to pass it used to rev up to 3500 rpm's with no drive train
response - now (after second visit to tranny shop) it will not go over 60
mph on the freeway and rpm's remain constant (although if I put it in
neutral it will rev up).

So the service shop is guesstimating that the computer is bad - but finding
one is proving difficult - the service shop is continuing diagnosis to see
if they can verify the computer is faulty......

thanks
paul

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4631fc30$0$21782$9a6e19ea@unlimited.newshosti ng.com...
> Some folks have been told their ECM is dead after getting the emergency
> brake recall done. There is a wire there on a bolt that is the ground for
> the fuel pump and if the 'tech' doesn't know about it, it can be left off
> and nothing they can do will make the pump work so they think the main ECM
> is dead.
>
> The other grounds for the ECM are near the oil dipstick bolted onto the
> block.
>
> It is a bit unusual to hear of a dead computer in a YJ...
>
> Mike
>
> paul wrote:
>> Ground strap is verified, brake wires are solid.....
>> ? ? ?
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>>> paul wrote:
>>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>>
>>>> thanks
>>>> paul
>>> Just FYI, if the ground strap that runs from the rear of the engine head
>>> up to the firewall goes punky, it will cause a computer failure.
>>>
>>> So can the recall on the emergency brake if they forget to hook up one
>>> wire onto the bolt there.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>> Canadian Off Road Trips Photos: Non members can still view!
>>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>> (More Off Road album links at bottom of the view page)
>>

 

Well - this is all related to an "assumed" tranny problem, after having much
work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
claimed a spark or vacuum problem. I changed plugs, wires, cap, rotor, and
even the ignition coil. no improvement. Went to a recommended service shop -
they told me that the crack in the exhaust manifold was causing the O2
sensor to mis-read and this created the tranny shifting problem --- well -
after replacing the manifold there is no improvement in performance:
From dead stop - full throttle the vehicle is slow (I6 4.0 3.07 gears - it
should be like a rocket) remaining at full throttle it will wind up and not
change gears unless foot is let off throttle. Then at highway speeds when
trying to pass it used to rev up to 3500 rpm's with no drive train
response - now (after second visit to tranny shop) it will not go over 60
mph on the freeway and rpm's remain constant (although if I put it in
neutral it will rev up).

So the service shop is guesstimating that the computer is bad - but finding
one is proving difficult - the service shop is continuing diagnosis to see
if they can verify the computer is faulty......

thanks
paul

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4631fc30$0$21782$9a6e19ea@unlimited.newshosti ng.com...
> Some folks have been told their ECM is dead after getting the emergency
> brake recall done. There is a wire there on a bolt that is the ground for
> the fuel pump and if the 'tech' doesn't know about it, it can be left off
> and nothing they can do will make the pump work so they think the main ECM
> is dead.
>
> The other grounds for the ECM are near the oil dipstick bolted onto the
> block.
>
> It is a bit unusual to hear of a dead computer in a YJ...
>
> Mike
>
> paul wrote:
>> Ground strap is verified, brake wires are solid.....
>> ? ? ?
>>
>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>>> paul wrote:
>>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>>
>>>> thanks
>>>> paul
>>> Just FYI, if the ground strap that runs from the rear of the engine head
>>> up to the firewall goes punky, it will cause a computer failure.
>>>
>>> So can the recall on the emergency brake if they forget to hook up one
>>> wire onto the bolt there.
>>>
>>> Mike
>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>> 88 Cherokee 235 BFG AT's
>>> Canadian Off Road Trips Photos: Non members can still view!
>>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>> (More Off Road album links at bottom of the view page)
>>

 

You are describing a failure in the TPS to me.

The plug and socket on it get dirty and need cleaning on a regular
basis. This controls throttle response and shifting. I recommend an
electronic spray contact cleaner, but even WD40 will do in a pinch.

If you have a multimeter I can give you the electrical test info for the
TPS also.

Mike

paul wrote:
> Well - this is all related to an "assumed" tranny problem, after having much
> work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
> claimed a spark or vacuum problem. I changed plugs, wires, cap, rotor, and
> even the ignition coil. no improvement. Went to a recommended service shop -
> they told me that the crack in the exhaust manifold was causing the O2
> sensor to mis-read and this created the tranny shifting problem --- well -
> after replacing the manifold there is no improvement in performance:
> From dead stop - full throttle the vehicle is slow (I6 4.0 3.07 gears - it
> should be like a rocket) remaining at full throttle it will wind up and not
> change gears unless foot is let off throttle. Then at highway speeds when
> trying to pass it used to rev up to 3500 rpm's with no drive train
> response - now (after second visit to tranny shop) it will not go over 60
> mph on the freeway and rpm's remain constant (although if I put it in
> neutral it will rev up).
>
> So the service shop is guesstimating that the computer is bad - but finding
> one is proving difficult - the service shop is continuing diagnosis to see
> if they can verify the computer is faulty......
>
> thanks
> paul
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4631fc30$0$21782$9a6e19ea@unlimited.newshosti ng.com...
>> Some folks have been told their ECM is dead after getting the emergency
>> brake recall done. There is a wire there on a bolt that is the ground for
>> the fuel pump and if the 'tech' doesn't know about it, it can be left off
>> and nothing they can do will make the pump work so they think the main ECM
>> is dead.
>>
>> The other grounds for the ECM are near the oil dipstick bolted onto the
>> block.
>>
>> It is a bit unusual to hear of a dead computer in a YJ...
>>
>> Mike
>>
>> paul wrote:
>>> Ground strap is verified, brake wires are solid.....
>>> ? ? ?
>>>
>>> "Mike Romain" <romainm@sympatico.ca> wrote in message
>>> news:4630ac5a$0$6663$9a6e19ea@unlimited.newshostin g.com...
>>>> paul wrote:
>>>>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>>>>
>>>>> thanks
>>>>> paul
>>>> Just FYI, if the ground strap that runs from the rear of the engine head
>>>> up to the firewall goes punky, it will cause a computer failure.
>>>>
>>>> So can the recall on the emergency brake if they forget to hook up one
>>>> wire onto the bolt there.
>>>>
>>>> Mike
>>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>>> 88 Cherokee 235 BFG AT's
>>>> Canadian Off Road Trips Photos: Non members can still view!
>>>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>>> (More Off Road album links at bottom of the view page)
>