Mystery Problem Changed Symptons.....
 

'91 Wrangler with a 4.0

Had some trouble about two weeks ago with cutting out as I was driving
down the road. Changed the Crank Position Sensor, and it worked fine
for a couple days, then cut out once more, waited 10 seconds then it
started up again and ran excellent for another week, no more cutting
out...Then, some other problems started. The engine now has
drastically reduced power. It won't go over 60 on the higway, and at
highway speeds it sounds kind of like one of those import cars with an
aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
Please help!!! Could it be some of the connections? electric? Not
once has the check engine light come on, the only code the mechanic can
get from the computer is one that has something to do with the air
conditioning.

Please help me!
Phil

Re: Mystery Problem Changed Symptons.....
 

On a 91 I would immediately suspect and remove and clean the wire mesh
body ground cable from the engine head to the firewall for all your
symptoms.

A bad connection between the battery and the block can cause it too.

You can look for it with a multimeter.

With the engine running and the headlights and even the heater fan on,
put
the volt meter on the battery posts and take a base reading. Then leave
one on the positive post and go with the other to the negative cable
clamp, then to the engine block, then to the alternator case, then to
the body of the Jeep. When you find the/a voltage change, that section
will have the bad connection.

You can do the same starting with the negative on it's post and walk the
positive cable connections to the power distribution box and starter
relay. You go to the clamps, then the bolt or post it is bolted onto to
see if that connection changes the voltage. Event the slightest voltage
drop is bad news and that connection will need a clean.

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)

Mariner15 wrote:
>
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil

Re: Mystery Problem Changed Symptons.....
 

On a 91 I would immediately suspect and remove and clean the wire mesh
body ground cable from the engine head to the firewall for all your
symptoms.

A bad connection between the battery and the block can cause it too.

You can look for it with a multimeter.

With the engine running and the headlights and even the heater fan on,
put
the volt meter on the battery posts and take a base reading. Then leave
one on the positive post and go with the other to the negative cable
clamp, then to the engine block, then to the alternator case, then to
the body of the Jeep. When you find the/a voltage change, that section
will have the bad connection.

You can do the same starting with the negative on it's post and walk the
positive cable connections to the power distribution box and starter
relay. You go to the clamps, then the bolt or post it is bolted onto to
see if that connection changes the voltage. Event the slightest voltage
drop is bad news and that connection will need a clean.

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)

Mariner15 wrote:
>
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil

Re: Mystery Problem Changed Symptons.....
 

On a 91 I would immediately suspect and remove and clean the wire mesh
body ground cable from the engine head to the firewall for all your
symptoms.

A bad connection between the battery and the block can cause it too.

You can look for it with a multimeter.

With the engine running and the headlights and even the heater fan on,
put
the volt meter on the battery posts and take a base reading. Then leave
one on the positive post and go with the other to the negative cable
clamp, then to the engine block, then to the alternator case, then to
the body of the Jeep. When you find the/a voltage change, that section
will have the bad connection.

You can do the same starting with the negative on it's post and walk the
positive cable connections to the power distribution box and starter
relay. You go to the clamps, then the bolt or post it is bolted onto to
see if that connection changes the voltage. Event the slightest voltage
drop is bad news and that connection will need a clean.

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)

Mariner15 wrote:
>
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil

Re: Mystery Problem Changed Symptons.....
 

On a 91 I would immediately suspect and remove and clean the wire mesh
body ground cable from the engine head to the firewall for all your
symptoms.

A bad connection between the battery and the block can cause it too.

You can look for it with a multimeter.

With the engine running and the headlights and even the heater fan on,
put
the volt meter on the battery posts and take a base reading. Then leave
one on the positive post and go with the other to the negative cable
clamp, then to the engine block, then to the alternator case, then to
the body of the Jeep. When you find the/a voltage change, that section
will have the bad connection.

You can do the same starting with the negative on it's post and walk the
positive cable connections to the power distribution box and starter
relay. You go to the clamps, then the bolt or post it is bolted onto to
see if that connection changes the voltage. Event the slightest voltage
drop is bad news and that connection will need a clean.

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)

Mariner15 wrote:
>
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil

Re: Mystery Problem Changed Symptons.....
 

"Mariner15" <pshirek1@bigred.unl.edu> wrote in message
news:1156981936.956985.233390@m79g2000cwm.googlegr oups.com...
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil
>

If the substrate in the catalytic converter breaks up and obstructs the
exhaust, it can at first be intermittent and cause your exact symptoms.
Be sure to rule that out.

Spdloader

Re: Mystery Problem Changed Symptons.....
 

"Mariner15" <pshirek1@bigred.unl.edu> wrote in message
news:1156981936.956985.233390@m79g2000cwm.googlegr oups.com...
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil
>

If the substrate in the catalytic converter breaks up and obstructs the
exhaust, it can at first be intermittent and cause your exact symptoms.
Be sure to rule that out.

Spdloader

Re: Mystery Problem Changed Symptons.....
 

"Mariner15" <pshirek1@bigred.unl.edu> wrote in message
news:1156981936.956985.233390@m79g2000cwm.googlegr oups.com...
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil
>

If the substrate in the catalytic converter breaks up and obstructs the
exhaust, it can at first be intermittent and cause your exact symptoms.
Be sure to rule that out.

Spdloader

Re: Mystery Problem Changed Symptons.....
 

"Mariner15" <pshirek1@bigred.unl.edu> wrote in message
news:1156981936.956985.233390@m79g2000cwm.googlegr oups.com...
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil
>

If the substrate in the catalytic converter breaks up and obstructs the
exhaust, it can at first be intermittent and cause your exact symptoms.
Be sure to rule that out.

Spdloader

Re: Mystery Problem Changed Symptons.....
 

I'm guessing clogged fuel filter that's cooked your pump, too.
Located inside the frame rail, on the drivers side above the front half
of the spring. There's a shield you have to remove to get to it.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Mariner15 wrote:
>
> '91 Wrangler with a 4.0
>
> Had some trouble about two weeks ago with cutting out as I was driving
> down the road. Changed the Crank Position Sensor, and it worked fine
> for a couple days, then cut out once more, waited 10 seconds then it
> started up again and ran excellent for another week, no more cutting
> out...Then, some other problems started. The engine now has
> drastically reduced power. It won't go over 60 on the higway, and at
> highway speeds it sounds kind of like one of those import cars with an
> aftermarket exhaust pipe. The mechainic can't figure out whats wrong.
> Please help!!! Could it be some of the connections? electric? Not
> once has the check engine light come on, the only code the mechanic can
> get from the computer is one that has something to do with the air
> conditioning.
>
> Please help me!
> Phil