Vacuum system problems on 88 YJ
 

Hi All,

I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
CA. The vacuum hoses are all messed up and the vacuum advance on the
distributor is always at full advance. Should there be something that
controls the level of vacuum going to the distributor? In the vacuum
diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
looks like there are several devices that I do not have. Can someone explain
to me what the devices on the very bottom of the diagram are (vacuum switch
assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
w/CHK VLV)? Should they be on my model and if so, where can I buy them and
how should I refer to them when ordering? Thanks for any help in advance.

Steve.

Re: Vacuum system problems on 88 YJ
 

Hi Steve,
Many SMOG diagrams at: http://home.sprynet.com/~dale02/list.htm
What the installer's visual goes by is the schematic decal under the
hood so follow that enough to snow him. And buy a new catalytic
converter as that's job to change pollutants like carbon monoxide (CO),
hydrocarbons (HC), oxides of Nitrogen (NOx) and particulate matter (PM)
into harmless substances like carbon dioxide (CO2), nitrogen (N2), and
water vapor (H2O): http://www.tifac.org.in/do/hgt/case/convert.htm Be
sure and do the normal maintenance, plugs, filters, and oil and it
should pass with flying colors: http://www.----------.com/smog.jpg
God Bless America, Bill O|||||||O
mailto:--------------------

steve wrote:
>
> Hi All,
>
> I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
> CA. The vacuum hoses are all messed up and the vacuum advance on the
> distributor is always at full advance. Should there be something that
> controls the level of vacuum going to the distributor? In the vacuum
> diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
> looks like there are several devices that I do not have. Can someone explain
> to me what the devices on the very bottom of the diagram are (vacuum switch
> assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
> w/CHK VLV)? Should they be on my model and if so, where can I buy them and
> how should I refer to them when ordering? Thanks for any help in advance.
>
> Steve.

Re: Vacuum system problems on 88 YJ
 

Hi Steve,
Many SMOG diagrams at: http://home.sprynet.com/~dale02/list.htm
What the installer's visual goes by is the schematic decal under the
hood so follow that enough to snow him. And buy a new catalytic
converter as that's job to change pollutants like carbon monoxide (CO),
hydrocarbons (HC), oxides of Nitrogen (NOx) and particulate matter (PM)
into harmless substances like carbon dioxide (CO2), nitrogen (N2), and
water vapor (H2O): http://www.tifac.org.in/do/hgt/case/convert.htm Be
sure and do the normal maintenance, plugs, filters, and oil and it
should pass with flying colors: http://www.----------.com/smog.jpg
God Bless America, Bill O|||||||O
mailto:--------------------

steve wrote:
>
> Hi All,
>
> I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
> CA. The vacuum hoses are all messed up and the vacuum advance on the
> distributor is always at full advance. Should there be something that
> controls the level of vacuum going to the distributor? In the vacuum
> diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
> looks like there are several devices that I do not have. Can someone explain
> to me what the devices on the very bottom of the diagram are (vacuum switch
> assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
> w/CHK VLV)? Should they be on my model and if so, where can I buy them and
> how should I refer to them when ordering? Thanks for any help in advance.
>
> Steve.

Re: Vacuum system problems on 88 YJ
 

Hi Steve,
Many SMOG diagrams at: http://home.sprynet.com/~dale02/list.htm
What the installer's visual goes by is the schematic decal under the
hood so follow that enough to snow him. And buy a new catalytic
converter as that's job to change pollutants like carbon monoxide (CO),
hydrocarbons (HC), oxides of Nitrogen (NOx) and particulate matter (PM)
into harmless substances like carbon dioxide (CO2), nitrogen (N2), and
water vapor (H2O): http://www.tifac.org.in/do/hgt/case/convert.htm Be
sure and do the normal maintenance, plugs, filters, and oil and it
should pass with flying colors: http://www.----------.com/smog.jpg
God Bless America, Bill O|||||||O
mailto:--------------------

steve wrote:
>
> Hi All,
>
> I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
> CA. The vacuum hoses are all messed up and the vacuum advance on the
> distributor is always at full advance. Should there be something that
> controls the level of vacuum going to the distributor? In the vacuum
> diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
> looks like there are several devices that I do not have. Can someone explain
> to me what the devices on the very bottom of the diagram are (vacuum switch
> assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
> w/CHK VLV)? Should they be on my model and if so, where can I buy them and
> how should I refer to them when ordering? Thanks for any help in advance.
>
> Steve.

Re: Vacuum system problems on 88 YJ
 

Bill gave you the links. Just FYI, the vacuum advance is manifold so it
is on full at idle and drops when you floor it or is a combination so it
seems always on. The computer is supposed to manage the timing advance.

There should be a round ball under the battery that is the vacuum
reservoir.

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

steve wrote:
>
> Hi All,
>
> I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
> CA. The vacuum hoses are all messed up and the vacuum advance on the
> distributor is always at full advance. Should there be something that
> controls the level of vacuum going to the distributor? In the vacuum
> diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
> looks like there are several devices that I do not have. Can someone explain
> to me what the devices on the very bottom of the diagram are (vacuum switch
> assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
> w/CHK VLV)? Should they be on my model and if so, where can I buy them and
> how should I refer to them when ordering? Thanks for any help in advance.
>
> Steve.

Re: Vacuum system problems on 88 YJ
 

Bill gave you the links. Just FYI, the vacuum advance is manifold so it
is on full at idle and drops when you floor it or is a combination so it
seems always on. The computer is supposed to manage the timing advance.

There should be a round ball under the battery that is the vacuum
reservoir.

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

steve wrote:
>
> Hi All,
>
> I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
> CA. The vacuum hoses are all messed up and the vacuum advance on the
> distributor is always at full advance. Should there be something that
> controls the level of vacuum going to the distributor? In the vacuum
> diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
> looks like there are several devices that I do not have. Can someone explain
> to me what the devices on the very bottom of the diagram are (vacuum switch
> assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
> w/CHK VLV)? Should they be on my model and if so, where can I buy them and
> how should I refer to them when ordering? Thanks for any help in advance.
>
> Steve.

Re: Vacuum system problems on 88 YJ
 

Bill gave you the links. Just FYI, the vacuum advance is manifold so it
is on full at idle and drops when you floor it or is a combination so it
seems always on. The computer is supposed to manage the timing advance.

There should be a round ball under the battery that is the vacuum
reservoir.

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

steve wrote:
>
> Hi All,
>
> I have an '88 YJ 258 4.2 6cyl 5sp man that has failed several smog checks in
> CA. The vacuum hoses are all messed up and the vacuum advance on the
> distributor is always at full advance. Should there be something that
> controls the level of vacuum going to the distributor? In the vacuum
> diagram found here http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm it
> looks like there are several devices that I do not have. Can someone explain
> to me what the devices on the very bottom of the diagram are (vacuum switch
> assembly, idle/decel SW, F/delay, VAC RSVR and at the bottom left VAC RSVR
> w/CHK VLV)? Should they be on my model and if so, where can I buy them and
> how should I refer to them when ordering? Thanks for any help in advance.
>
> Steve.