Every CPS I have seen fail were just perfect still. The failure is only
in the plug connections. They are very small computer signal pins and
sit right on top of the exhaust manifold so are subjected to wild
temperature swings.
Opening the plug and cleaning it with a good spray contact cleaner has
fixed every one 'I' have come across.

If you google it, you will see lot of folks say 'oh, you can get some
more starts out of it if you just unplug it to 'reset' it.' Well, they
do not 'reset', the movement just cleans the contacts slightly.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Patrick wrote:
>
> mine did that, Jeep was running then got really ruff idling and engine died.
> took 3-4 attempt before it start again . That was Monday night. Tuesday was
> fine and then Wed morning the Jeep never restart until CPS been replace.....
>
> "Jerry Bransford" <jerrypb@***.net> a écrit dans le message de news:
> BUdke.2205$tp.349@fed1read05...
> > Possibly the crankshaft position sensor is starting to go bad, it gives
> > symptoms that are identical to what you encountered. The CPS gives the
> > master timing signal for the engine and when it goes bad, the engine just
> > suddenly dies like someone pulled the plug. They do often go intermittent
> > first so that also goes along with the engine starting up again later.
> >
> > Joe wrote:
> >> Have a really weird problem coming home from Death Valley while on
> >> vacation.
> >> Just cruising along about 65 with the ac cranking in about 95 degrees
> >> out.
> >> the water temp was a shade over 210 and everything was fine. Then without
> >> warning I notice a sudden loss of power as if someone turned the ignition
> >> off. Which scared me because I was on the 127 freeway out in the middle
> >> of
> >> nowhere. then the engine came back to life. this cutting in and out
> >> occurred
> >> sporadically all the way to the I-15 freeway. It would cut out then come
> >> back online. Everything seemed fine as far as the alt, temp and gas gauge
> >> goes. It finally died 30 miles before Barstow and then I had to be towed
> >> in.
> >> After it died I tried to restart it and it started fine. The check engine
> >> light did come on longer then usual but soon went out. I had it towed to
> >> a
> >> shop in Barstow the AAA suggested I go. They did not find a thing wrong
> >> with
> >> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no
> >> codes
> >> showed up, spark plugs fine, and they test drove it 30 miles. So I drove
> >> it
> >> the rest of the way home without the AC running and made it ok. Just
> >> really
> >> gets me as to what the problem could be, Any ideas? The only thing that I
> >> can think of is a corroded battery terminal?? A/C might have been
> >> drawing
> >> to much current, denying the computer antiquate power??
> >>
> >> 98 TJ 4.0
> >> 45,000
> >> 5 spd
> >>
> >>
> >
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/

 

Every CPS I have seen fail were just perfect still. The failure is only
in the plug connections. They are very small computer signal pins and
sit right on top of the exhaust manifold so are subjected to wild
temperature swings.
Opening the plug and cleaning it with a good spray contact cleaner has
fixed every one 'I' have come across.

If you google it, you will see lot of folks say 'oh, you can get some
more starts out of it if you just unplug it to 'reset' it.' Well, they
do not 'reset', the movement just cleans the contacts slightly.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Patrick wrote:
>
> mine did that, Jeep was running then got really ruff idling and engine died.
> took 3-4 attempt before it start again . That was Monday night. Tuesday was
> fine and then Wed morning the Jeep never restart until CPS been replace.....
>
> "Jerry Bransford" <jerrypb@***.net> a écrit dans le message de news:
> BUdke.2205$tp.349@fed1read05...
> > Possibly the crankshaft position sensor is starting to go bad, it gives
> > symptoms that are identical to what you encountered. The CPS gives the
> > master timing signal for the engine and when it goes bad, the engine just
> > suddenly dies like someone pulled the plug. They do often go intermittent
> > first so that also goes along with the engine starting up again later.
> >
> > Joe wrote:
> >> Have a really weird problem coming home from Death Valley while on
> >> vacation.
> >> Just cruising along about 65 with the ac cranking in about 95 degrees
> >> out.
> >> the water temp was a shade over 210 and everything was fine. Then without
> >> warning I notice a sudden loss of power as if someone turned the ignition
> >> off. Which scared me because I was on the 127 freeway out in the middle
> >> of
> >> nowhere. then the engine came back to life. this cutting in and out
> >> occurred
> >> sporadically all the way to the I-15 freeway. It would cut out then come
> >> back online. Everything seemed fine as far as the alt, temp and gas gauge
> >> goes. It finally died 30 miles before Barstow and then I had to be towed
> >> in.
> >> After it died I tried to restart it and it started fine. The check engine
> >> light did come on longer then usual but soon went out. I had it towed to
> >> a
> >> shop in Barstow the AAA suggested I go. They did not find a thing wrong
> >> with
> >> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no
> >> codes
> >> showed up, spark plugs fine, and they test drove it 30 miles. So I drove
> >> it
> >> the rest of the way home without the AC running and made it ok. Just
> >> really
> >> gets me as to what the problem could be, Any ideas? The only thing that I
> >> can think of is a corroded battery terminal?? A/C might have been
> >> drawing
> >> to much current, denying the computer antiquate power??
> >>
> >> 98 TJ 4.0
> >> 45,000
> >> 5 spd
> >>
> >>
> >
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/

 

Every CPS I have seen fail were just perfect still. The failure is only
in the plug connections. They are very small computer signal pins and
sit right on top of the exhaust manifold so are subjected to wild
temperature swings.
Opening the plug and cleaning it with a good spray contact cleaner has
fixed every one 'I' have come across.

If you google it, you will see lot of folks say 'oh, you can get some
more starts out of it if you just unplug it to 'reset' it.' Well, they
do not 'reset', the movement just cleans the contacts slightly.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Patrick wrote:
>
> mine did that, Jeep was running then got really ruff idling and engine died.
> took 3-4 attempt before it start again . That was Monday night. Tuesday was
> fine and then Wed morning the Jeep never restart until CPS been replace.....
>
> "Jerry Bransford" <jerrypb@***.net> a écrit dans le message de news:
> BUdke.2205$tp.349@fed1read05...
> > Possibly the crankshaft position sensor is starting to go bad, it gives
> > symptoms that are identical to what you encountered. The CPS gives the
> > master timing signal for the engine and when it goes bad, the engine just
> > suddenly dies like someone pulled the plug. They do often go intermittent
> > first so that also goes along with the engine starting up again later.
> >
> > Joe wrote:
> >> Have a really weird problem coming home from Death Valley while on
> >> vacation.
> >> Just cruising along about 65 with the ac cranking in about 95 degrees
> >> out.
> >> the water temp was a shade over 210 and everything was fine. Then without
> >> warning I notice a sudden loss of power as if someone turned the ignition
> >> off. Which scared me because I was on the 127 freeway out in the middle
> >> of
> >> nowhere. then the engine came back to life. this cutting in and out
> >> occurred
> >> sporadically all the way to the I-15 freeway. It would cut out then come
> >> back online. Everything seemed fine as far as the alt, temp and gas gauge
> >> goes. It finally died 30 miles before Barstow and then I had to be towed
> >> in.
> >> After it died I tried to restart it and it started fine. The check engine
> >> light did come on longer then usual but soon went out. I had it towed to
> >> a
> >> shop in Barstow the AAA suggested I go. They did not find a thing wrong
> >> with
> >> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no
> >> codes
> >> showed up, spark plugs fine, and they test drove it 30 miles. So I drove
> >> it
> >> the rest of the way home without the AC running and made it ok. Just
> >> really
> >> gets me as to what the problem could be, Any ideas? The only thing that I
> >> can think of is a corroded battery terminal?? A/C might have been
> >> drawing
> >> to much current, denying the computer antiquate power??
> >>
> >> 98 TJ 4.0
> >> 45,000
> >> 5 spd
> >>
> >>
> >
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/

 

Would't he get a 54 error code though? Same exact thing happened
with mine, but I absolutely got a 54 after each "event"


On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
wrote:

>Possibly the crankshaft position sensor is starting to go bad, it gives
>symptoms that are identical to what you encountered. The CPS gives the
>master timing signal for the engine and when it goes bad, the engine
>just suddenly dies like someone pulled the plug. They do often go
>intermittent first so that also goes along with the engine starting up
>again later.
>
>Joe wrote:
>> Have a really weird problem coming home from Death Valley while on vacation.
>> Just cruising along about 65 with the ac cranking in about 95 degrees out.
>> the water temp was a shade over 210 and everything was fine. Then without
>> warning I notice a sudden loss of power as if someone turned the ignition
>> off. Which scared me because I was on the 127 freeway out in the middle of
>> nowhere. then the engine came back to life. this cutting in and out occurred
>> sporadically all the way to the I-15 freeway. It would cut out then come
>> back online. Everything seemed fine as far as the alt, temp and gas gauge
>> goes. It finally died 30 miles before Barstow and then I had to be towed in.
>> After it died I tried to restart it and it started fine. The check engine
>> light did come on longer then usual but soon went out. I had it towed to a
>> shop in Barstow the AAA suggested I go. They did not find a thing wrong with
>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no codes
>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove it
>> the rest of the way home without the AC running and made it ok. Just really
>> gets me as to what the problem could be, Any ideas? The only thing that I
>> can think of is a corroded battery terminal?? A/C might have been drawing
>> to much current, denying the computer antiquate power??
>>
>> 98 TJ 4.0
>> 45,000
>> 5 spd
>>
>>

 

Would't he get a 54 error code though? Same exact thing happened
with mine, but I absolutely got a 54 after each "event"


On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
wrote:

>Possibly the crankshaft position sensor is starting to go bad, it gives
>symptoms that are identical to what you encountered. The CPS gives the
>master timing signal for the engine and when it goes bad, the engine
>just suddenly dies like someone pulled the plug. They do often go
>intermittent first so that also goes along with the engine starting up
>again later.
>
>Joe wrote:
>> Have a really weird problem coming home from Death Valley while on vacation.
>> Just cruising along about 65 with the ac cranking in about 95 degrees out.
>> the water temp was a shade over 210 and everything was fine. Then without
>> warning I notice a sudden loss of power as if someone turned the ignition
>> off. Which scared me because I was on the 127 freeway out in the middle of
>> nowhere. then the engine came back to life. this cutting in and out occurred
>> sporadically all the way to the I-15 freeway. It would cut out then come
>> back online. Everything seemed fine as far as the alt, temp and gas gauge
>> goes. It finally died 30 miles before Barstow and then I had to be towed in.
>> After it died I tried to restart it and it started fine. The check engine
>> light did come on longer then usual but soon went out. I had it towed to a
>> shop in Barstow the AAA suggested I go. They did not find a thing wrong with
>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no codes
>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove it
>> the rest of the way home without the AC running and made it ok. Just really
>> gets me as to what the problem could be, Any ideas? The only thing that I
>> can think of is a corroded battery terminal?? A/C might have been drawing
>> to much current, denying the computer antiquate power??
>>
>> 98 TJ 4.0
>> 45,000
>> 5 spd
>>
>>

 

Would't he get a 54 error code though? Same exact thing happened
with mine, but I absolutely got a 54 after each "event"


On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
wrote:

>Possibly the crankshaft position sensor is starting to go bad, it gives
>symptoms that are identical to what you encountered. The CPS gives the
>master timing signal for the engine and when it goes bad, the engine
>just suddenly dies like someone pulled the plug. They do often go
>intermittent first so that also goes along with the engine starting up
>again later.
>
>Joe wrote:
>> Have a really weird problem coming home from Death Valley while on vacation.
>> Just cruising along about 65 with the ac cranking in about 95 degrees out.
>> the water temp was a shade over 210 and everything was fine. Then without
>> warning I notice a sudden loss of power as if someone turned the ignition
>> off. Which scared me because I was on the 127 freeway out in the middle of
>> nowhere. then the engine came back to life. this cutting in and out occurred
>> sporadically all the way to the I-15 freeway. It would cut out then come
>> back online. Everything seemed fine as far as the alt, temp and gas gauge
>> goes. It finally died 30 miles before Barstow and then I had to be towed in.
>> After it died I tried to restart it and it started fine. The check engine
>> light did come on longer then usual but soon went out. I had it towed to a
>> shop in Barstow the AAA suggested I go. They did not find a thing wrong with
>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no codes
>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove it
>> the rest of the way home without the AC running and made it ok. Just really
>> gets me as to what the problem could be, Any ideas? The only thing that I
>> can think of is a corroded battery terminal?? A/C might have been drawing
>> to much current, denying the computer antiquate power??
>>
>> 98 TJ 4.0
>> 45,000
>> 5 spd
>>
>>

 

Would't he get a 54 error code though? Same exact thing happened
with mine, but I absolutely got a 54 after each "event"


On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
wrote:

>Possibly the crankshaft position sensor is starting to go bad, it gives
>symptoms that are identical to what you encountered. The CPS gives the
>master timing signal for the engine and when it goes bad, the engine
>just suddenly dies like someone pulled the plug. They do often go
>intermittent first so that also goes along with the engine starting up
>again later.
>
>Joe wrote:
>> Have a really weird problem coming home from Death Valley while on vacation.
>> Just cruising along about 65 with the ac cranking in about 95 degrees out.
>> the water temp was a shade over 210 and everything was fine. Then without
>> warning I notice a sudden loss of power as if someone turned the ignition
>> off. Which scared me because I was on the 127 freeway out in the middle of
>> nowhere. then the engine came back to life. this cutting in and out occurred
>> sporadically all the way to the I-15 freeway. It would cut out then come
>> back online. Everything seemed fine as far as the alt, temp and gas gauge
>> goes. It finally died 30 miles before Barstow and then I had to be towed in.
>> After it died I tried to restart it and it started fine. The check engine
>> light did come on longer then usual but soon went out. I had it towed to a
>> shop in Barstow the AAA suggested I go. They did not find a thing wrong with
>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no codes
>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove it
>> the rest of the way home without the AC running and made it ok. Just really
>> gets me as to what the problem could be, Any ideas? The only thing that I
>> can think of is a corroded battery terminal?? A/C might have been drawing
>> to much current, denying the computer antiquate power??
>>
>> 98 TJ 4.0
>> 45,000
>> 5 spd
>>
>>

 

He may not get any code, the CPS went bad on my 93 XJ, it took the
stealership 6 visits to gamble and decide to change the CPS on spec. I
would take the XJ in right after I experienced the same symptoms and there
would be no codes. On the last visit the "jeep mech and jeep electrician"
were both back from holidays and training so after about a 15 min wait they
had the CPS changed and ready to go on a two week trial. If the problem
reoccurred they would look for other possibilities if during the two week
time everything went well, then I was to go back and settle up the bill.

It's been 6 yrs since I paid that bill and no problems since they changed
the CPS.

Snow...


"Dallas Kincaid" <dallas@xecu.net> wrote in message
news:7qu391h4f7ktuc1dpbum5bln77k8kij08s@4ax.com...
> Would't he get a 54 error code though? Same exact thing happened
> with mine, but I absolutely got a 54 after each "event"
>
>
> On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
> wrote:
>
>>Possibly the crankshaft position sensor is starting to go bad, it gives
>>symptoms that are identical to what you encountered. The CPS gives the
>>master timing signal for the engine and when it goes bad, the engine
>>just suddenly dies like someone pulled the plug. They do often go
>>intermittent first so that also goes along with the engine starting up
>>again later.
>>
>>Joe wrote:
>>> Have a really weird problem coming home from Death Valley while on
>>> vacation.
>>> Just cruising along about 65 with the ac cranking in about 95 degrees
>>> out.
>>> the water temp was a shade over 210 and everything was fine. Then
>>> without
>>> warning I notice a sudden loss of power as if someone turned the
>>> ignition
>>> off. Which scared me because I was on the 127 freeway out in the middle
>>> of
>>> nowhere. then the engine came back to life. this cutting in and out
>>> occurred
>>> sporadically all the way to the I-15 freeway. It would cut out then come
>>> back online. Everything seemed fine as far as the alt, temp and gas
>>> gauge
>>> goes. It finally died 30 miles before Barstow and then I had to be towed
>>> in.
>>> After it died I tried to restart it and it started fine. The check
>>> engine
>>> light did come on longer then usual but soon went out. I had it towed to
>>> a
>>> shop in Barstow the AAA suggested I go. They did not find a thing wrong
>>> with
>>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no
>>> codes
>>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove
>>> it
>>> the rest of the way home without the AC running and made it ok. Just
>>> really
>>> gets me as to what the problem could be, Any ideas? The only thing that
>>> I
>>> can think of is a corroded battery terminal?? A/C might have been
>>> drawing
>>> to much current, denying the computer antiquate power??
>>>
>>> 98 TJ 4.0
>>> 45,000
>>> 5 spd
>>>
>>>
>

 

He may not get any code, the CPS went bad on my 93 XJ, it took the
stealership 6 visits to gamble and decide to change the CPS on spec. I
would take the XJ in right after I experienced the same symptoms and there
would be no codes. On the last visit the "jeep mech and jeep electrician"
were both back from holidays and training so after about a 15 min wait they
had the CPS changed and ready to go on a two week trial. If the problem
reoccurred they would look for other possibilities if during the two week
time everything went well, then I was to go back and settle up the bill.

It's been 6 yrs since I paid that bill and no problems since they changed
the CPS.

Snow...


"Dallas Kincaid" <dallas@xecu.net> wrote in message
news:7qu391h4f7ktuc1dpbum5bln77k8kij08s@4ax.com...
> Would't he get a 54 error code though? Same exact thing happened
> with mine, but I absolutely got a 54 after each "event"
>
>
> On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
> wrote:
>
>>Possibly the crankshaft position sensor is starting to go bad, it gives
>>symptoms that are identical to what you encountered. The CPS gives the
>>master timing signal for the engine and when it goes bad, the engine
>>just suddenly dies like someone pulled the plug. They do often go
>>intermittent first so that also goes along with the engine starting up
>>again later.
>>
>>Joe wrote:
>>> Have a really weird problem coming home from Death Valley while on
>>> vacation.
>>> Just cruising along about 65 with the ac cranking in about 95 degrees
>>> out.
>>> the water temp was a shade over 210 and everything was fine. Then
>>> without
>>> warning I notice a sudden loss of power as if someone turned the
>>> ignition
>>> off. Which scared me because I was on the 127 freeway out in the middle
>>> of
>>> nowhere. then the engine came back to life. this cutting in and out
>>> occurred
>>> sporadically all the way to the I-15 freeway. It would cut out then come
>>> back online. Everything seemed fine as far as the alt, temp and gas
>>> gauge
>>> goes. It finally died 30 miles before Barstow and then I had to be towed
>>> in.
>>> After it died I tried to restart it and it started fine. The check
>>> engine
>>> light did come on longer then usual but soon went out. I had it towed to
>>> a
>>> shop in Barstow the AAA suggested I go. They did not find a thing wrong
>>> with
>>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no
>>> codes
>>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove
>>> it
>>> the rest of the way home without the AC running and made it ok. Just
>>> really
>>> gets me as to what the problem could be, Any ideas? The only thing that
>>> I
>>> can think of is a corroded battery terminal?? A/C might have been
>>> drawing
>>> to much current, denying the computer antiquate power??
>>>
>>> 98 TJ 4.0
>>> 45,000
>>> 5 spd
>>>
>>>
>

 

He may not get any code, the CPS went bad on my 93 XJ, it took the
stealership 6 visits to gamble and decide to change the CPS on spec. I
would take the XJ in right after I experienced the same symptoms and there
would be no codes. On the last visit the "jeep mech and jeep electrician"
were both back from holidays and training so after about a 15 min wait they
had the CPS changed and ready to go on a two week trial. If the problem
reoccurred they would look for other possibilities if during the two week
time everything went well, then I was to go back and settle up the bill.

It's been 6 yrs since I paid that bill and no problems since they changed
the CPS.

Snow...


"Dallas Kincaid" <dallas@xecu.net> wrote in message
news:7qu391h4f7ktuc1dpbum5bln77k8kij08s@4ax.com...
> Would't he get a 54 error code though? Same exact thing happened
> with mine, but I absolutely got a 54 after each "event"
>
>
> On Sun, 22 May 2005 22:31:06 -0700, Jerry Bransford <jerrypb@***.net>
> wrote:
>
>>Possibly the crankshaft position sensor is starting to go bad, it gives
>>symptoms that are identical to what you encountered. The CPS gives the
>>master timing signal for the engine and when it goes bad, the engine
>>just suddenly dies like someone pulled the plug. They do often go
>>intermittent first so that also goes along with the engine starting up
>>again later.
>>
>>Joe wrote:
>>> Have a really weird problem coming home from Death Valley while on
>>> vacation.
>>> Just cruising along about 65 with the ac cranking in about 95 degrees
>>> out.
>>> the water temp was a shade over 210 and everything was fine. Then
>>> without
>>> warning I notice a sudden loss of power as if someone turned the
>>> ignition
>>> off. Which scared me because I was on the 127 freeway out in the middle
>>> of
>>> nowhere. then the engine came back to life. this cutting in and out
>>> occurred
>>> sporadically all the way to the I-15 freeway. It would cut out then come
>>> back online. Everything seemed fine as far as the alt, temp and gas
>>> gauge
>>> goes. It finally died 30 miles before Barstow and then I had to be towed
>>> in.
>>> After it died I tried to restart it and it started fine. The check
>>> engine
>>> light did come on longer then usual but soon went out. I had it towed to
>>> a
>>> shop in Barstow the AAA suggested I go. They did not find a thing wrong
>>> with
>>> it. Cat was fine, the MAP was ok. cap and rotor ok, fuel pump ok, no
>>> codes
>>> showed up, spark plugs fine, and they test drove it 30 miles. So I drove
>>> it
>>> the rest of the way home without the AC running and made it ok. Just
>>> really
>>> gets me as to what the problem could be, Any ideas? The only thing that
>>> I
>>> can think of is a corroded battery terminal?? A/C might have been
>>> drawing
>>> to much current, denying the computer antiquate power??
>>>
>>> 98 TJ 4.0
>>> 45,000
>>> 5 spd
>>>
>>>
>