Ah, thanks, you just opened the can of worms that I was looking at. My
`89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
box, as well as around both valve cover grommets and the filler cap.
There's a small diameter hard tube that exits the rear third of the valve
cover and enters the intake manifold. There's a large-bore hard tube that
exits the front third of the valve cover and enters the rear of the filter
box. Clearly something isn't venting correctly, but where should I look?


On Mon, 12 Apr 2004, Mike Romain wrote:

> So I guess no matter what engine you have it does need a couple
> flushes. You should put an additive in, drive it a bit then change the
> oil. Several times.
>
> I am concerned a bit with the PCV thing. If the mechanic doesn't know
> the difference between a PCV and CCV, well... Run fast...
>
> Jeep engines are really touchy about the PCV and CCV systems working
> right or they can blow massive amounts of oil into the air filters.
> Enough I know a few folks that got suckered into new engines only to
> have the same oil blow that only needed a $5.00 fix...
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Adonis wrote:
> >
> > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > blow-by in which I have, he explained that I need to flush my engine, but
> > googling around suggests that it may be my PCV valve (which is broken,
> > physically) but also when the guy stuck his finger into the filler cap there
> > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > to flush out the contaminants this week and to return next week to flush it
> > again for another 40$, as well as he will replace the PCV, should this be a
> > go? or should I go somewhere else?
> >
> > Any suggestions are greatly appreciated.
> >
> > Adonis
>

 

Ah, thanks, you just opened the can of worms that I was looking at. My
`89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
box, as well as around both valve cover grommets and the filler cap.
There's a small diameter hard tube that exits the rear third of the valve
cover and enters the intake manifold. There's a large-bore hard tube that
exits the front third of the valve cover and enters the rear of the filter
box. Clearly something isn't venting correctly, but where should I look?


On Mon, 12 Apr 2004, Mike Romain wrote:

> So I guess no matter what engine you have it does need a couple
> flushes. You should put an additive in, drive it a bit then change the
> oil. Several times.
>
> I am concerned a bit with the PCV thing. If the mechanic doesn't know
> the difference between a PCV and CCV, well... Run fast...
>
> Jeep engines are really touchy about the PCV and CCV systems working
> right or they can blow massive amounts of oil into the air filters.
> Enough I know a few folks that got suckered into new engines only to
> have the same oil blow that only needed a $5.00 fix...
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Adonis wrote:
> >
> > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > blow-by in which I have, he explained that I need to flush my engine, but
> > googling around suggests that it may be my PCV valve (which is broken,
> > physically) but also when the guy stuck his finger into the filler cap there
> > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > to flush out the contaminants this week and to return next week to flush it
> > again for another 40$, as well as he will replace the PCV, should this be a
> > go? or should I go somewhere else?
> >
> > Any suggestions are greatly appreciated.
> >
> > Adonis
>

 

Ah, thanks, you just opened the can of worms that I was looking at. My
`89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
box, as well as around both valve cover grommets and the filler cap.
There's a small diameter hard tube that exits the rear third of the valve
cover and enters the intake manifold. There's a large-bore hard tube that
exits the front third of the valve cover and enters the rear of the filter
box. Clearly something isn't venting correctly, but where should I look?


On Mon, 12 Apr 2004, Mike Romain wrote:

> So I guess no matter what engine you have it does need a couple
> flushes. You should put an additive in, drive it a bit then change the
> oil. Several times.
>
> I am concerned a bit with the PCV thing. If the mechanic doesn't know
> the difference between a PCV and CCV, well... Run fast...
>
> Jeep engines are really touchy about the PCV and CCV systems working
> right or they can blow massive amounts of oil into the air filters.
> Enough I know a few folks that got suckered into new engines only to
> have the same oil blow that only needed a $5.00 fix...
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Adonis wrote:
> >
> > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > blow-by in which I have, he explained that I need to flush my engine, but
> > googling around suggests that it may be my PCV valve (which is broken,
> > physically) but also when the guy stuck his finger into the filler cap there
> > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > to flush out the contaminants this week and to return next week to flush it
> > again for another 40$, as well as he will replace the PCV, should this be a
> > go? or should I go somewhere else?
> >
> > Any suggestions are greatly appreciated.
> >
> > Adonis
>

 

The rear plastic tube is plugged up. A good soak in carb cleaner and a
ream with a chunk of insulated wire fixed mine. 12 gauge automotive wire
I think it was.

The CCV grommet in the rear has a metered hole that can be cleaned out
with a paper clip. If it has been blocked for a long time, sludge will
have built up and the grommet might need to be taken out to clean under
it or even the cover removed to really clean it out.

The CCV is calibrated to use the air intake hose from the filter. If
the grommets are leaking, too much air can get in and the CCV will not
suck hard enough so again oil spits into the air filter.

Same for a worn out oil filler cap.

But if the back tube is plugged, it just spits oil out everywhere, fix
that first and see if the leaks continue, if they do seal more up.

Here is a link on it with some part numbers for new:

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Mike


Lee Ayrton wrote:
>
> Ah, thanks, you just opened the can of worms that I was looking at. My
> `89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
> box, as well as around both valve cover grommets and the filler cap.
> There's a small diameter hard tube that exits the rear third of the valve
> cover and enters the intake manifold. There's a large-bore hard tube that
> exits the front third of the valve cover and enters the rear of the filter
> box. Clearly something isn't venting correctly, but where should I look?
>
> On Mon, 12 Apr 2004, Mike Romain wrote:
>
> > So I guess no matter what engine you have it does need a couple
> > flushes. You should put an additive in, drive it a bit then change the
> > oil. Several times.
> >
> > I am concerned a bit with the PCV thing. If the mechanic doesn't know
> > the difference between a PCV and CCV, well... Run fast...
> >
> > Jeep engines are really touchy about the PCV and CCV systems working
> > right or they can blow massive amounts of oil into the air filters.
> > Enough I know a few folks that got suckered into new engines only to
> > have the same oil blow that only needed a $5.00 fix...
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Adonis wrote:
> > >
> > > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > > blow-by in which I have, he explained that I need to flush my engine, but
> > > googling around suggests that it may be my PCV valve (which is broken,
> > > physically) but also when the guy stuck his finger into the filler cap there
> > > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > > to flush out the contaminants this week and to return next week to flush it
> > > again for another 40$, as well as he will replace the PCV, should this be a
> > > go? or should I go somewhere else?
> > >
> > > Any suggestions are greatly appreciated.
> > >
> > > Adonis
> >

 

The rear plastic tube is plugged up. A good soak in carb cleaner and a
ream with a chunk of insulated wire fixed mine. 12 gauge automotive wire
I think it was.

The CCV grommet in the rear has a metered hole that can be cleaned out
with a paper clip. If it has been blocked for a long time, sludge will
have built up and the grommet might need to be taken out to clean under
it or even the cover removed to really clean it out.

The CCV is calibrated to use the air intake hose from the filter. If
the grommets are leaking, too much air can get in and the CCV will not
suck hard enough so again oil spits into the air filter.

Same for a worn out oil filler cap.

But if the back tube is plugged, it just spits oil out everywhere, fix
that first and see if the leaks continue, if they do seal more up.

Here is a link on it with some part numbers for new:

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Mike


Lee Ayrton wrote:
>
> Ah, thanks, you just opened the can of worms that I was looking at. My
> `89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
> box, as well as around both valve cover grommets and the filler cap.
> There's a small diameter hard tube that exits the rear third of the valve
> cover and enters the intake manifold. There's a large-bore hard tube that
> exits the front third of the valve cover and enters the rear of the filter
> box. Clearly something isn't venting correctly, but where should I look?
>
> On Mon, 12 Apr 2004, Mike Romain wrote:
>
> > So I guess no matter what engine you have it does need a couple
> > flushes. You should put an additive in, drive it a bit then change the
> > oil. Several times.
> >
> > I am concerned a bit with the PCV thing. If the mechanic doesn't know
> > the difference between a PCV and CCV, well... Run fast...
> >
> > Jeep engines are really touchy about the PCV and CCV systems working
> > right or they can blow massive amounts of oil into the air filters.
> > Enough I know a few folks that got suckered into new engines only to
> > have the same oil blow that only needed a $5.00 fix...
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Adonis wrote:
> > >
> > > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > > blow-by in which I have, he explained that I need to flush my engine, but
> > > googling around suggests that it may be my PCV valve (which is broken,
> > > physically) but also when the guy stuck his finger into the filler cap there
> > > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > > to flush out the contaminants this week and to return next week to flush it
> > > again for another 40$, as well as he will replace the PCV, should this be a
> > > go? or should I go somewhere else?
> > >
> > > Any suggestions are greatly appreciated.
> > >
> > > Adonis
> >

 

The rear plastic tube is plugged up. A good soak in carb cleaner and a
ream with a chunk of insulated wire fixed mine. 12 gauge automotive wire
I think it was.

The CCV grommet in the rear has a metered hole that can be cleaned out
with a paper clip. If it has been blocked for a long time, sludge will
have built up and the grommet might need to be taken out to clean under
it or even the cover removed to really clean it out.

The CCV is calibrated to use the air intake hose from the filter. If
the grommets are leaking, too much air can get in and the CCV will not
suck hard enough so again oil spits into the air filter.

Same for a worn out oil filler cap.

But if the back tube is plugged, it just spits oil out everywhere, fix
that first and see if the leaks continue, if they do seal more up.

Here is a link on it with some part numbers for new:

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Mike


Lee Ayrton wrote:
>
> Ah, thanks, you just opened the can of worms that I was looking at. My
> `89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
> box, as well as around both valve cover grommets and the filler cap.
> There's a small diameter hard tube that exits the rear third of the valve
> cover and enters the intake manifold. There's a large-bore hard tube that
> exits the front third of the valve cover and enters the rear of the filter
> box. Clearly something isn't venting correctly, but where should I look?
>
> On Mon, 12 Apr 2004, Mike Romain wrote:
>
> > So I guess no matter what engine you have it does need a couple
> > flushes. You should put an additive in, drive it a bit then change the
> > oil. Several times.
> >
> > I am concerned a bit with the PCV thing. If the mechanic doesn't know
> > the difference between a PCV and CCV, well... Run fast...
> >
> > Jeep engines are really touchy about the PCV and CCV systems working
> > right or they can blow massive amounts of oil into the air filters.
> > Enough I know a few folks that got suckered into new engines only to
> > have the same oil blow that only needed a $5.00 fix...
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Adonis wrote:
> > >
> > > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > > blow-by in which I have, he explained that I need to flush my engine, but
> > > googling around suggests that it may be my PCV valve (which is broken,
> > > physically) but also when the guy stuck his finger into the filler cap there
> > > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > > to flush out the contaminants this week and to return next week to flush it
> > > again for another 40$, as well as he will replace the PCV, should this be a
> > > go? or should I go somewhere else?
> > >
> > > Any suggestions are greatly appreciated.
> > >
> > > Adonis
> >

 

The rear plastic tube is plugged up. A good soak in carb cleaner and a
ream with a chunk of insulated wire fixed mine. 12 gauge automotive wire
I think it was.

The CCV grommet in the rear has a metered hole that can be cleaned out
with a paper clip. If it has been blocked for a long time, sludge will
have built up and the grommet might need to be taken out to clean under
it or even the cover removed to really clean it out.

The CCV is calibrated to use the air intake hose from the filter. If
the grommets are leaking, too much air can get in and the CCV will not
suck hard enough so again oil spits into the air filter.

Same for a worn out oil filler cap.

But if the back tube is plugged, it just spits oil out everywhere, fix
that first and see if the leaks continue, if they do seal more up.

Here is a link on it with some part numbers for new:

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Mike


Lee Ayrton wrote:
>
> Ah, thanks, you just opened the can of worms that I was looking at. My
> `89 Cherokee 4.0 is blowing a respectable amount of oil into the filter
> box, as well as around both valve cover grommets and the filler cap.
> There's a small diameter hard tube that exits the rear third of the valve
> cover and enters the intake manifold. There's a large-bore hard tube that
> exits the front third of the valve cover and enters the rear of the filter
> box. Clearly something isn't venting correctly, but where should I look?
>
> On Mon, 12 Apr 2004, Mike Romain wrote:
>
> > So I guess no matter what engine you have it does need a couple
> > flushes. You should put an additive in, drive it a bit then change the
> > oil. Several times.
> >
> > I am concerned a bit with the PCV thing. If the mechanic doesn't know
> > the difference between a PCV and CCV, well... Run fast...
> >
> > Jeep engines are really touchy about the PCV and CCV systems working
> > right or they can blow massive amounts of oil into the air filters.
> > Enough I know a few folks that got suckered into new engines only to
> > have the same oil blow that only needed a $5.00 fix...
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Adonis wrote:
> > >
> > > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > > blow-by in which I have, he explained that I need to flush my engine, but
> > > googling around suggests that it may be my PCV valve (which is broken,
> > > physically) but also when the guy stuck his finger into the filler cap there
> > > was a very good amount of sludge, he wants to charge 40$ for an oil change
> > > to flush out the contaminants this week and to return next week to flush it
> > > again for another 40$, as well as he will replace the PCV, should this be a
> > > go? or should I go somewhere else?
> > >
> > > Any suggestions are greatly appreciated.
> > >
> > > Adonis
> >

 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:407AC155.882B96E3@sympatico.ca...
> Most XJ's don't have a PCV valve. What engine do you have in there?
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Adonis wrote:
> >
> > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > blow-by in which I have, he explained that I need to flush my engine,
but
> > googling around suggests that it may be my PCV valve (which is broken,
> > physically) but also when the guy stuck his finger into the filler cap
there
> > was a very good amount of sludge, he wants to charge 40$ for an oil
change
> > to flush out the contaminants this week and to return next week to flush
it
> > again for another 40$, as well as he will replace the PCV, should this
be a
> > go? or should I go somewhere else?
> >
> > Any suggestions are greatly appreciated.
> >
> > Adonis

I have an L6

 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:407AC155.882B96E3@sympatico.ca...
> Most XJ's don't have a PCV valve. What engine do you have in there?
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Adonis wrote:
> >
> > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > blow-by in which I have, he explained that I need to flush my engine,
but
> > googling around suggests that it may be my PCV valve (which is broken,
> > physically) but also when the guy stuck his finger into the filler cap
there
> > was a very good amount of sludge, he wants to charge 40$ for an oil
change
> > to flush out the contaminants this week and to return next week to flush
it
> > again for another 40$, as well as he will replace the PCV, should this
be a
> > go? or should I go somewhere else?
> >
> > Any suggestions are greatly appreciated.
> >
> > Adonis

I have an L6

 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:407AC155.882B96E3@sympatico.ca...
> Most XJ's don't have a PCV valve. What engine do you have in there?
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Adonis wrote:
> >
> > I took my 94XJ to a local Jeep hobbyist install/repair shop with some
> > blow-by in which I have, he explained that I need to flush my engine,
but
> > googling around suggests that it may be my PCV valve (which is broken,
> > physically) but also when the guy stuck his finger into the filler cap
there
> > was a very good amount of sludge, he wants to charge 40$ for an oil
change
> > to flush out the contaminants this week and to return next week to flush
it
> > again for another 40$, as well as he will replace the PCV, should this
be a
> > go? or should I go somewhere else?
> >
> > Any suggestions are greatly appreciated.
> >
> > Adonis

I have an L6