Re: 1993 GC Limited - I Miss My Jeep!!
 

>"billy ray" was heard to say...
>Jeep uses 2 (at least) types of CPS units.
>http://members.cox.net/wilsond/Fixes...tml#CPSdetails
>
>There is the one type that is secured by one bolt, that must be adjusted for
>clearance with the paper spacer that comes with the new unit..
>
>The other type is secured with 2 bolts and does not require adjustment.

The later is the version on my jeep. I said shim but meant spacer. I
know if the spacer isn't right when the replacement is installed, it
can completely ruin the new CPS.

Right now we're still testing and tracing as much as possible but
coming up empty. We're still leaning towards a mis-matched or
mis-programmed PCM.

Anyone ever hear of paint particles from autobody work getting into
the sensors and causing problems?

`Casper

>>"Mike Romain" wrote in message
>> When the CPS goes bad, the vehicle usually up and dies. The plug and
>> socket for it can and do get dirty though, but again that usually causes
>> a stall. There are no shims on it, it just fits in one spot. People do
>> try to alter it for modified vehicles, but that isn't normal use.

Re: 1993 GC Limited - I Miss My Jeep!!
 

Silicone RTV fumes can kill O2 sensors faster than you can blink. They
now make the more expensive 'sensor safe' silicone RTV. If you have
fresh silicone anywhere near the engine it could cause continuing
troubles.

I can't see how paint can get at sensors, but it could interfere with
some.

The only CPS's 'I' am familiar with just bolt in. There are no
spacers. I haven't seen that many though.

Mike

Casper wrote:
>
> >"billy ray" was heard to say...
> >Jeep uses 2 (at least) types of CPS units.
> >http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> >
> >There is the one type that is secured by one bolt, that must be adjusted for
> >clearance with the paper spacer that comes with the new unit..
> >
> >The other type is secured with 2 bolts and does not require adjustment.
>
> The later is the version on my jeep. I said shim but meant spacer. I
> know if the spacer isn't right when the replacement is installed, it
> can completely ruin the new CPS.
>
> Right now we're still testing and tracing as much as possible but
> coming up empty. We're still leaning towards a mis-matched or
> mis-programmed PCM.
>
> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?
>
> `Casper
>
> >>"Mike Romain" wrote in message
> >> When the CPS goes bad, the vehicle usually up and dies. The plug and
> >> socket for it can and do get dirty though, but again that usually causes
> >> a stall. There are no shims on it, it just fits in one spot. People do
> >> try to alter it for modified vehicles, but that isn't normal use.

Re: 1993 GC Limited - I Miss My Jeep!!
 

Silicone RTV fumes can kill O2 sensors faster than you can blink. They
now make the more expensive 'sensor safe' silicone RTV. If you have
fresh silicone anywhere near the engine it could cause continuing
troubles.

I can't see how paint can get at sensors, but it could interfere with
some.

The only CPS's 'I' am familiar with just bolt in. There are no
spacers. I haven't seen that many though.

Mike

Casper wrote:
>
> >"billy ray" was heard to say...
> >Jeep uses 2 (at least) types of CPS units.
> >http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> >
> >There is the one type that is secured by one bolt, that must be adjusted for
> >clearance with the paper spacer that comes with the new unit..
> >
> >The other type is secured with 2 bolts and does not require adjustment.
>
> The later is the version on my jeep. I said shim but meant spacer. I
> know if the spacer isn't right when the replacement is installed, it
> can completely ruin the new CPS.
>
> Right now we're still testing and tracing as much as possible but
> coming up empty. We're still leaning towards a mis-matched or
> mis-programmed PCM.
>
> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?
>
> `Casper
>
> >>"Mike Romain" wrote in message
> >> When the CPS goes bad, the vehicle usually up and dies. The plug and
> >> socket for it can and do get dirty though, but again that usually causes
> >> a stall. There are no shims on it, it just fits in one spot. People do
> >> try to alter it for modified vehicles, but that isn't normal use.

Re: 1993 GC Limited - I Miss My Jeep!!
 

Silicone RTV fumes can kill O2 sensors faster than you can blink. They
now make the more expensive 'sensor safe' silicone RTV. If you have
fresh silicone anywhere near the engine it could cause continuing
troubles.

I can't see how paint can get at sensors, but it could interfere with
some.

The only CPS's 'I' am familiar with just bolt in. There are no
spacers. I haven't seen that many though.

Mike

Casper wrote:
>
> >"billy ray" was heard to say...
> >Jeep uses 2 (at least) types of CPS units.
> >http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> >
> >There is the one type that is secured by one bolt, that must be adjusted for
> >clearance with the paper spacer that comes with the new unit..
> >
> >The other type is secured with 2 bolts and does not require adjustment.
>
> The later is the version on my jeep. I said shim but meant spacer. I
> know if the spacer isn't right when the replacement is installed, it
> can completely ruin the new CPS.
>
> Right now we're still testing and tracing as much as possible but
> coming up empty. We're still leaning towards a mis-matched or
> mis-programmed PCM.
>
> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?
>
> `Casper
>
> >>"Mike Romain" wrote in message
> >> When the CPS goes bad, the vehicle usually up and dies. The plug and
> >> socket for it can and do get dirty though, but again that usually causes
> >> a stall. There are no shims on it, it just fits in one spot. People do
> >> try to alter it for modified vehicles, but that isn't normal use.

Re: 1993 GC Limited - I Miss My Jeep!!
 

Silicone RTV fumes can kill O2 sensors faster than you can blink. They
now make the more expensive 'sensor safe' silicone RTV. If you have
fresh silicone anywhere near the engine it could cause continuing
troubles.

I can't see how paint can get at sensors, but it could interfere with
some.

The only CPS's 'I' am familiar with just bolt in. There are no
spacers. I haven't seen that many though.

Mike

Casper wrote:
>
> >"billy ray" was heard to say...
> >Jeep uses 2 (at least) types of CPS units.
> >http://members.cox.net/wilsond/Fixes...tml#CPSdetails
> >
> >There is the one type that is secured by one bolt, that must be adjusted for
> >clearance with the paper spacer that comes with the new unit..
> >
> >The other type is secured with 2 bolts and does not require adjustment.
>
> The later is the version on my jeep. I said shim but meant spacer. I
> know if the spacer isn't right when the replacement is installed, it
> can completely ruin the new CPS.
>
> Right now we're still testing and tracing as much as possible but
> coming up empty. We're still leaning towards a mis-matched or
> mis-programmed PCM.
>
> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?
>
> `Casper
>
> >>"Mike Romain" wrote in message
> >> When the CPS goes bad, the vehicle usually up and dies. The plug and
> >> socket for it can and do get dirty though, but again that usually causes
> >> a stall. There are no shims on it, it just fits in one spot. People do
> >> try to alter it for modified vehicles, but that isn't normal use.

Re: 1993 GC Limited - I Miss My Jeep!!
 

Casper wrote:

> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?

The only sensor that can be affected by gas is the O2 sensor.
RTV especially. I'm not sure anything but epoxy based paint
would cause problems. Hardly anyone uses epoxy paint anyway.

The rest of them are basically immune or hanging off of vac lines
with no exposure.


--
DougW

Re: 1993 GC Limited - I Miss My Jeep!!
 

Casper wrote:

> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?

The only sensor that can be affected by gas is the O2 sensor.
RTV especially. I'm not sure anything but epoxy based paint
would cause problems. Hardly anyone uses epoxy paint anyway.

The rest of them are basically immune or hanging off of vac lines
with no exposure.


--
DougW

Re: 1993 GC Limited - I Miss My Jeep!!
 

Casper wrote:

> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?

The only sensor that can be affected by gas is the O2 sensor.
RTV especially. I'm not sure anything but epoxy based paint
would cause problems. Hardly anyone uses epoxy paint anyway.

The rest of them are basically immune or hanging off of vac lines
with no exposure.


--
DougW

Re: 1993 GC Limited - I Miss My Jeep!!
 

Casper wrote:

> Anyone ever hear of paint particles from autobody work getting into
> the sensors and causing problems?

The only sensor that can be affected by gas is the O2 sensor.
RTV especially. I'm not sure anything but epoxy based paint
would cause problems. Hardly anyone uses epoxy paint anyway.

The rest of them are basically immune or hanging off of vac lines
with no exposure.


--
DougW

Re: 1993 GC Limited - I Miss My Jeep!!
 

After swapping to Champions, add a fat ground braid between the body
near the battery and a nice big bolt on the engine. If that doesn't do
it, maybe the brain and or coil is just too weak to spark.


Mike Romain proclaimed:

> When the CPS goes bad, the vehicle usually up and dies. The plug and
> socket for it can and do get dirty though, but again that usually causes
> a stall. There are no shims on it, it just fits in one spot. People do
> try to alter it for modified vehicles, but that isn't normal use.
>
> Mike
>
> Casper wrote:
>
>>>Wow......
>>>
>>>I too would be suspecting the junkyard brain. Maybe a 'new' one would
>>>be in order.
>>
>>Yeah, it is definitly a suspect. I hope to know either later today or
>>in the next couple of days. Since I have access to a newer one (not
>>new tho), I am hoping that will help resolve things if it's needed.
>>
>>
>>>And FYI, I know that some 258 and apparently some 4.0 engines won't run
>>>on bosch plugs. The plugs foul black very quickly and the engine misses
>>>like a bugger. When I switch them to Champion plugs they run fine.
>>
>>I have heard that, but have been using the Bosch for a number of years
>>on several of my vehicles and have yet to see this occur, until just
>>now. I'd be in agreement if it weren't for the fact that the other
>>plug brands are also fouling right now in the Jeep.
>>
>>
>>>I likely mentioned this before, but when you have a missing or broken
>>>ground path, the vehicle can steal grounds through things like gas
>>>cables and radios and shifters and brake pedals. This normally causes
>>>all kinds of seemingly unrelated issues usually computer or sensor
>>>related. One main computer ground tag point is usually a bolt into the
>>>block near the dipstick. There are a mess of black wires there.
>>>Sometimes one gets dropped out when it gets hooked up.
>>>Mike
>>
>>Yep, went over this near the beginning of this saga. Checked them over
>>several times and found nothing. Although, since I know some of the
>>wiring has been replaced due to damage/shorting in the accident, I
>>keep reminding the mechanics that there still may be something they
>>have yet to locate.
>>
>>Another concern mentioned to me was that the CPS (Crank Position
>>Sensor) may have a shim issue and or been damaged. I'm not too
>>familiar with how the vehicle can react with a damamged one, but I am
>>hoping this has also been looked at. I've got one mechanic saying his
>>tests show it's bad and a second mechanic saying it's good. Bear in
>>mind, it's already been replaced once, same time as the PCM.
>>
>>Thanks for the input Mike!
>>
>>`Casper
>>
>>I plan to post what the final outcome is so hopefully no one else will
>>ever have to go thru this and glean some useful information from my
>>problems and saga. :)