Mike Romain

As per mike's post:

If the purge valve goes bad, then it basically shuts down your PCV
system, messing the idle and usually causing oil to blow into the
air
filter through the valve cover intake line.


BINGO !!!!! That is my precise symptom. I just assumed the old
canister had finally packed it in, causing PCV
circulation to fail. I'll have to get my manual out and find this
valve.

NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
original carb :>)


That is a bad purge valve. If you trace the PCV line to the back of the
carb, make sure the elbow hasn't collapsed. Back of the carb there is a
solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
you just use a T fitting. Off this a line goes to the top of the
canister.

At idle pinch this line to the canister closed. If the idle changes the
canister purge is messed up.

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

Mike Romain

As per mike's post:

If the purge valve goes bad, then it basically shuts down your PCV
system, messing the idle and usually causing oil to blow into the
air
filter through the valve cover intake line.


BINGO !!!!! That is my precise symptom. I just assumed the old
canister had finally packed it in, causing PCV
circulation to fail. I'll have to get my manual out and find this
valve.

NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
original carb :>)


That is a bad purge valve. If you trace the PCV line to the back of the
carb, make sure the elbow hasn't collapsed. Back of the carb there is a
solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
you just use a T fitting. Off this a line goes to the top of the
canister.

At idle pinch this line to the canister closed. If the idle changes the
canister purge is messed up.

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

Mike Romain

As per mike's post:

If the purge valve goes bad, then it basically shuts down your PCV
system, messing the idle and usually causing oil to blow into the
air
filter through the valve cover intake line.


BINGO !!!!! That is my precise symptom. I just assumed the old
canister had finally packed it in, causing PCV
circulation to fail. I'll have to get my manual out and find this
valve.

NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
original carb :>)


That is a bad purge valve. If you trace the PCV line to the back of the
carb, make sure the elbow hasn't collapsed. Back of the carb there is a
solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
you just use a T fitting. Off this a line goes to the top of the
canister.

At idle pinch this line to the canister closed. If the idle changes the
canister purge is messed up.

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

Rod Gramlich

Mike,

I pulled the EGR last night, and discovered it full of grease, mud,
carbon, leaves ................ to name a few. I completely cleaned it up,
and reinstalled (using a high temp Si for gasket ....... since I destroyed
old gasket in the process. NOTE that a mech. friend of mine tells me to make
that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
it) and it seems OK (it's not stuck shut at least ..... and it's warm here
now :>), so I couldn't really test it properly - well I guess I could use
the freezer :). I drove to work this am and there did not "seem" to be the
lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
have to give it a few runs to convince myself of that.

The large hose from PCV to base of carb definitely appears slightly
compression sucked/shrunk at the bend prior to carb fitting.

tks,
rod





"Mike Romain" <romainm@sympatico.ca> wrote in message
news:40732EEC.7B9526D6@sympatico.ca...
> As per mike's post:
>
> If the purge valve goes bad, then it basically shuts down your PCV
> system, messing the idle and usually causing oil to blow into the
> air
> filter through the valve cover intake line.
>
>
> BINGO !!!!! That is my precise symptom. I just assumed the old
> canister had finally packed it in, causing PCV
> circulation to fail. I'll have to get my manual out and find this
> valve.
>
> NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> original carb :>)
>
>
> That is a bad purge valve. If you trace the PCV line to the back of the
> carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> you just use a T fitting. Off this a line goes to the top of the
> canister.
>
> At idle pinch this line to the canister closed. If the idle changes the
> canister purge is messed up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Rod Gramlich

Mike,

I pulled the EGR last night, and discovered it full of grease, mud,
carbon, leaves ................ to name a few. I completely cleaned it up,
and reinstalled (using a high temp Si for gasket ....... since I destroyed
old gasket in the process. NOTE that a mech. friend of mine tells me to make
that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
it) and it seems OK (it's not stuck shut at least ..... and it's warm here
now :>), so I couldn't really test it properly - well I guess I could use
the freezer :). I drove to work this am and there did not "seem" to be the
lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
have to give it a few runs to convince myself of that.

The large hose from PCV to base of carb definitely appears slightly
compression sucked/shrunk at the bend prior to carb fitting.

tks,
rod





"Mike Romain" <romainm@sympatico.ca> wrote in message
news:40732EEC.7B9526D6@sympatico.ca...
> As per mike's post:
>
> If the purge valve goes bad, then it basically shuts down your PCV
> system, messing the idle and usually causing oil to blow into the
> air
> filter through the valve cover intake line.
>
>
> BINGO !!!!! That is my precise symptom. I just assumed the old
> canister had finally packed it in, causing PCV
> circulation to fail. I'll have to get my manual out and find this
> valve.
>
> NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> original carb :>)
>
>
> That is a bad purge valve. If you trace the PCV line to the back of the
> carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> you just use a T fitting. Off this a line goes to the top of the
> canister.
>
> At idle pinch this line to the canister closed. If the idle changes the
> canister purge is messed up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Rod Gramlich

Mike,

I pulled the EGR last night, and discovered it full of grease, mud,
carbon, leaves ................ to name a few. I completely cleaned it up,
and reinstalled (using a high temp Si for gasket ....... since I destroyed
old gasket in the process. NOTE that a mech. friend of mine tells me to make
that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
it) and it seems OK (it's not stuck shut at least ..... and it's warm here
now :>), so I couldn't really test it properly - well I guess I could use
the freezer :). I drove to work this am and there did not "seem" to be the
lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
have to give it a few runs to convince myself of that.

The large hose from PCV to base of carb definitely appears slightly
compression sucked/shrunk at the bend prior to carb fitting.

tks,
rod





"Mike Romain" <romainm@sympatico.ca> wrote in message
news:40732EEC.7B9526D6@sympatico.ca...
> As per mike's post:
>
> If the purge valve goes bad, then it basically shuts down your PCV
> system, messing the idle and usually causing oil to blow into the
> air
> filter through the valve cover intake line.
>
>
> BINGO !!!!! That is my precise symptom. I just assumed the old
> canister had finally packed it in, causing PCV
> circulation to fail. I'll have to get my manual out and find this
> valve.
>
> NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> original carb :>)
>
>
> That is a bad purge valve. If you trace the PCV line to the back of the
> carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> you just use a T fitting. Off this a line goes to the top of the
> canister.
>
> At idle pinch this line to the canister closed. If the idle changes the
> canister purge is messed up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Rod Gramlich

Mike,

I pulled the EGR last night, and discovered it full of grease, mud,
carbon, leaves ................ to name a few. I completely cleaned it up,
and reinstalled (using a high temp Si for gasket ....... since I destroyed
old gasket in the process. NOTE that a mech. friend of mine tells me to make
that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
it) and it seems OK (it's not stuck shut at least ..... and it's warm here
now :>), so I couldn't really test it properly - well I guess I could use
the freezer :). I drove to work this am and there did not "seem" to be the
lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
have to give it a few runs to convince myself of that.

The large hose from PCV to base of carb definitely appears slightly
compression sucked/shrunk at the bend prior to carb fitting.

tks,
rod





"Mike Romain" <romainm@sympatico.ca> wrote in message
news:40732EEC.7B9526D6@sympatico.ca...
> As per mike's post:
>
> If the purge valve goes bad, then it basically shuts down your PCV
> system, messing the idle and usually causing oil to blow into the
> air
> filter through the valve cover intake line.
>
>
> BINGO !!!!! That is my precise symptom. I just assumed the old
> canister had finally packed it in, causing PCV
> circulation to fail. I'll have to get my manual out and find this
> valve.
>
> NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> original carb :>)
>
>
> That is a bad purge valve. If you trace the PCV line to the back of the
> carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> you just use a T fitting. Off this a line goes to the top of the
> canister.
>
> At idle pinch this line to the canister closed. If the idle changes the
> canister purge is messed up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's

Mike Romain

The PCV flow is metered to match the intake hose from the air filter and
the charcoal canister purge input.

If the elbow has half collapsed, that can interfere enough to give you
some oil blowing into the air filter. They are really touchy about
that. Even a bad leak on the valve cover gaskets or grommets can affect
the flow enough to spit oil.

If you can pinch off the PCV line from the back of the carb to the
canister and the idle doesn't change, then I would just change the air
filter on the canister to make the canister flow right and fix that
elbow up and then see what happens.

Mike

Rod Gramlich wrote:
>
> Mike,
>
> I pulled the EGR last night, and discovered it full of grease, mud,
> carbon, leaves ................ to name a few. I completely cleaned it up,
> and reinstalled (using a high temp Si for gasket ....... since I destroyed
> old gasket in the process. NOTE that a mech. friend of mine tells me to make
> that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
> also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
> it) and it seems OK (it's not stuck shut at least ..... and it's warm here
> now :>), so I couldn't really test it properly - well I guess I could use
> the freezer :). I drove to work this am and there did not "seem" to be the
> lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
> have to give it a few runs to convince myself of that.
>
> The large hose from PCV to base of carb definitely appears slightly
> compression sucked/shrunk at the bend prior to carb fitting.
>
> tks,
> rod
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:40732EEC.7B9526D6@sympatico.ca...
> > As per mike's post:
> >
> > If the purge valve goes bad, then it basically shuts down your PCV
> > system, messing the idle and usually causing oil to blow into the
> > air
> > filter through the valve cover intake line.
> >
> >
> > BINGO !!!!! That is my precise symptom. I just assumed the old
> > canister had finally packed it in, causing PCV
> > circulation to fail. I'll have to get my manual out and find this
> > valve.
> >
> > NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> > original carb :>)
> >
> >
> > That is a bad purge valve. If you trace the PCV line to the back of the
> > carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> > solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> > you just use a T fitting. Off this a line goes to the top of the
> > canister.
> >
> > At idle pinch this line to the canister closed. If the idle changes the
> > canister purge is messed up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's

Mike Romain

The PCV flow is metered to match the intake hose from the air filter and
the charcoal canister purge input.

If the elbow has half collapsed, that can interfere enough to give you
some oil blowing into the air filter. They are really touchy about
that. Even a bad leak on the valve cover gaskets or grommets can affect
the flow enough to spit oil.

If you can pinch off the PCV line from the back of the carb to the
canister and the idle doesn't change, then I would just change the air
filter on the canister to make the canister flow right and fix that
elbow up and then see what happens.

Mike

Rod Gramlich wrote:
>
> Mike,
>
> I pulled the EGR last night, and discovered it full of grease, mud,
> carbon, leaves ................ to name a few. I completely cleaned it up,
> and reinstalled (using a high temp Si for gasket ....... since I destroyed
> old gasket in the process. NOTE that a mech. friend of mine tells me to make
> that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
> also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
> it) and it seems OK (it's not stuck shut at least ..... and it's warm here
> now :>), so I couldn't really test it properly - well I guess I could use
> the freezer :). I drove to work this am and there did not "seem" to be the
> lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
> have to give it a few runs to convince myself of that.
>
> The large hose from PCV to base of carb definitely appears slightly
> compression sucked/shrunk at the bend prior to carb fitting.
>
> tks,
> rod
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:40732EEC.7B9526D6@sympatico.ca...
> > As per mike's post:
> >
> > If the purge valve goes bad, then it basically shuts down your PCV
> > system, messing the idle and usually causing oil to blow into the
> > air
> > filter through the valve cover intake line.
> >
> >
> > BINGO !!!!! That is my precise symptom. I just assumed the old
> > canister had finally packed it in, causing PCV
> > circulation to fail. I'll have to get my manual out and find this
> > valve.
> >
> > NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> > original carb :>)
> >
> >
> > That is a bad purge valve. If you trace the PCV line to the back of the
> > carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> > solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> > you just use a T fitting. Off this a line goes to the top of the
> > canister.
> >
> > At idle pinch this line to the canister closed. If the idle changes the
> > canister purge is messed up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's

Mike Romain

The PCV flow is metered to match the intake hose from the air filter and
the charcoal canister purge input.

If the elbow has half collapsed, that can interfere enough to give you
some oil blowing into the air filter. They are really touchy about
that. Even a bad leak on the valve cover gaskets or grommets can affect
the flow enough to spit oil.

If you can pinch off the PCV line from the back of the carb to the
canister and the idle doesn't change, then I would just change the air
filter on the canister to make the canister flow right and fix that
elbow up and then see what happens.

Mike

Rod Gramlich wrote:
>
> Mike,
>
> I pulled the EGR last night, and discovered it full of grease, mud,
> carbon, leaves ................ to name a few. I completely cleaned it up,
> and reinstalled (using a high temp Si for gasket ....... since I destroyed
> old gasket in the process. NOTE that a mech. friend of mine tells me to make
> that a temp fix/gasket, and replace with proper metal clad gasket ASAP). I
> also pulled the 'delay valve' *between EGR and PCV** (as my Haynes decribes
> it) and it seems OK (it's not stuck shut at least ..... and it's warm here
> now :>), so I couldn't really test it properly - well I guess I could use
> the freezer :). I drove to work this am and there did not "seem" to be the
> lingering odor of gasoline fumes. Maybe it's wishful thinking ...... I'll
> have to give it a few runs to convince myself of that.
>
> The large hose from PCV to base of carb definitely appears slightly
> compression sucked/shrunk at the bend prior to carb fitting.
>
> tks,
> rod
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:40732EEC.7B9526D6@sympatico.ca...
> > As per mike's post:
> >
> > If the purge valve goes bad, then it basically shuts down your PCV
> > system, messing the idle and usually causing oil to blow into the
> > air
> > filter through the valve cover intake line.
> >
> >
> > BINGO !!!!! That is my precise symptom. I just assumed the old
> > canister had finally packed it in, causing PCV
> > circulation to fail. I'll have to get my manual out and find this
> > valve.
> >
> > NOTE: Vehicle runs/idles fine (a miracle for the 258 c/w rebuild of
> > original carb :>)
> >
> >
> > That is a bad purge valve. If you trace the PCV line to the back of the
> > carb, make sure the elbow hasn't collapsed. Back of the carb there is a
> > solenoid or T fitting. The solenoid can be tossed, it's a recall thing,
> > you just use a T fitting. Off this a line goes to the top of the
> > canister.
> >
> > At idle pinch this line to the canister closed. If the idle changes the
> > canister purge is messed up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's