Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
On Tue, 13 Jan 2004 17:50:11 -0600, "gosling1" <jduchock@bellsout.net>
wrote:
>
>
>"L.W. (ßill) ------ III" <----------@***.net> wrote in message
>news:40046B04.C03AD94C@***.net...
>> You mean there's another person with the 2.8L GM engine, Chevrolet
>> won't even put it in their cars?
>> God Bless America, ßill O|||||||O
>> mailto:-------------------- http://www.----------.com/
>LOL I guess I am another one. I ended up with this combination from an
>auction. I was able to get almost 200,000 miles out of it until it finally
>gave up the ghost two weeks ago.
I had an '84 S-10 4x4 2.8, 5 sp.
Got 350,000 miles out of the rig and would still be driving it if I
hadn't wrecked the poor thing.
--
Old Crow
'82 Shovelhead FLT 92" 'Pearl'
'95 Jeep YJ Rio Grande
ASE Certified Master Auto Tech + L1
TOMKAT, BS#133, SENS, MAMBM, DOF#51
wrote:
>
>
>"L.W. (ßill) ------ III" <----------@***.net> wrote in message
>news:40046B04.C03AD94C@***.net...
>> You mean there's another person with the 2.8L GM engine, Chevrolet
>> won't even put it in their cars?
>> God Bless America, ßill O|||||||O
>> mailto:-------------------- http://www.----------.com/
>LOL I guess I am another one. I ended up with this combination from an
>auction. I was able to get almost 200,000 miles out of it until it finally
>gave up the ghost two weeks ago.
I had an '84 S-10 4x4 2.8, 5 sp.
Got 350,000 miles out of the rig and would still be driving it if I
hadn't wrecked the poor thing.
--
Old Crow
'82 Shovelhead FLT 92" 'Pearl'
'95 Jeep YJ Rio Grande
ASE Certified Master Auto Tech + L1
TOMKAT, BS#133, SENS, MAMBM, DOF#51
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
On Tue, 13 Jan 2004 17:50:11 -0600, "gosling1" <jduchock@bellsout.net>
wrote:
>
>
>"L.W. (ßill) ------ III" <----------@***.net> wrote in message
>news:40046B04.C03AD94C@***.net...
>> You mean there's another person with the 2.8L GM engine, Chevrolet
>> won't even put it in their cars?
>> God Bless America, ßill O|||||||O
>> mailto:-------------------- http://www.----------.com/
>LOL I guess I am another one. I ended up with this combination from an
>auction. I was able to get almost 200,000 miles out of it until it finally
>gave up the ghost two weeks ago.
I had an '84 S-10 4x4 2.8, 5 sp.
Got 350,000 miles out of the rig and would still be driving it if I
hadn't wrecked the poor thing.
--
Old Crow
'82 Shovelhead FLT 92" 'Pearl'
'95 Jeep YJ Rio Grande
ASE Certified Master Auto Tech + L1
TOMKAT, BS#133, SENS, MAMBM, DOF#51
wrote:
>
>
>"L.W. (ßill) ------ III" <----------@***.net> wrote in message
>news:40046B04.C03AD94C@***.net...
>> You mean there's another person with the 2.8L GM engine, Chevrolet
>> won't even put it in their cars?
>> God Bless America, ßill O|||||||O
>> mailto:-------------------- http://www.----------.com/
>LOL I guess I am another one. I ended up with this combination from an
>auction. I was able to get almost 200,000 miles out of it until it finally
>gave up the ghost two weeks ago.
I had an '84 S-10 4x4 2.8, 5 sp.
Got 350,000 miles out of the rig and would still be driving it if I
hadn't wrecked the poor thing.
--
Old Crow
'82 Shovelhead FLT 92" 'Pearl'
'95 Jeep YJ Rio Grande
ASE Certified Master Auto Tech + L1
TOMKAT, BS#133, SENS, MAMBM, DOF#51
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
On Tue, 13 Jan 2004 17:50:11 -0600, "gosling1" <jduchock@bellsout.net>
wrote:
>
>
>"L.W. (ßill) ------ III" <----------@***.net> wrote in message
>news:40046B04.C03AD94C@***.net...
>> You mean there's another person with the 2.8L GM engine, Chevrolet
>> won't even put it in their cars?
>> God Bless America, ßill O|||||||O
>> mailto:-------------------- http://www.----------.com/
>LOL I guess I am another one. I ended up with this combination from an
>auction. I was able to get almost 200,000 miles out of it until it finally
>gave up the ghost two weeks ago.
I had an '84 S-10 4x4 2.8, 5 sp.
Got 350,000 miles out of the rig and would still be driving it if I
hadn't wrecked the poor thing.
--
Old Crow
'82 Shovelhead FLT 92" 'Pearl'
'95 Jeep YJ Rio Grande
ASE Certified Master Auto Tech + L1
TOMKAT, BS#133, SENS, MAMBM, DOF#51
wrote:
>
>
>"L.W. (ßill) ------ III" <----------@***.net> wrote in message
>news:40046B04.C03AD94C@***.net...
>> You mean there's another person with the 2.8L GM engine, Chevrolet
>> won't even put it in their cars?
>> God Bless America, ßill O|||||||O
>> mailto:-------------------- http://www.----------.com/
>LOL I guess I am another one. I ended up with this combination from an
>auction. I was able to get almost 200,000 miles out of it until it finally
>gave up the ghost two weeks ago.
I had an '84 S-10 4x4 2.8, 5 sp.
Got 350,000 miles out of the rig and would still be driving it if I
hadn't wrecked the poor thing.
--
Old Crow
'82 Shovelhead FLT 92" 'Pearl'
'95 Jeep YJ Rio Grande
ASE Certified Master Auto Tech + L1
TOMKAT, BS#133, SENS, MAMBM, DOF#51
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
The engine isnt bad at all (for what it is) its just that it needs to
be precisely set up because of all the extra emissions controls.
Hell, the reason I went with the 2.8 was that until recently you could
get an out of the box new target engine for $1600.
In article <40046B04.C03AD94C@***.net>, ßill <----------@***.net> wrote:
> You mean there's another person with the 2.8L GM engine, Chevrolet
> won't even put it in their cars?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich Hampel wrote:
> >
> > Found the cause of the paradox of rich mixture and low vacuum on my
> > 2.8L.
> > Eventually I located a teeny pin hole in the deceleration valve which
> > caused the diaphragm not to uncover the orfice plate at high vacuum.
> > The decel valve only opens at normal to high vacuum. With the valve
> > malfunctioning the engine was trying to aspirate (into the 'E' port on
> > the Rochester vari-jet) carb solely through the pcv valve ---- not
> > enough air yielded rich burn, but with the valve not working: low
> > vacuum .... thus the paradox.
> >
> > Other:
> > Stalling on left turn does NOT involve the carb float !!!!!!!!!!
> > Another anomaly also solved in the step by step search of the vacuum
> > problem (and a problem that has been posted here many many times):
> > Engine would stall when turning left (not right). The 'usual'
> > suggestion is to increase the float height in the carb ..... WRONG
> > WRONG WRONG as that will only cause the carb to dump gas into the
> > intake manifold when you shut down and totally flood it and you still
> > stall when turning left.
> > The solution is a freakin teeny pressure switch on the high pressure
> > side of power steering pump .... when the pump goes over pressure the
> > switch (also) energizes the throttle kicker. $30.00 new switch and I
> > can turn to left again!!!! You might want to remember this info for
> > those who have 2.8L engines that stall when turning left (not right).
> >
> > Anyway thanks to all who posted suggestions even that your suggestions
> > didnt work, I thank all of you for your help...... At least the
> > discussions here are extremely helpful in sorting things out. At
> > least I learned that after 300K miles you should replace the *entire*
> > emissions control system components ... its a BIG PITA if you dont. Im
> > now back to full power and 23+ mpg for long haul runs at speed.
> > Im now planning to make at least 500,000 miles on this XJ Cherokee
> > beast (- currently doing a semi-frame-off restoration). Too bad
> > DaimlerC cant build a vehicle to that standard, or without costing
> > $100,000 across the parts counter !!!!!!!!
be precisely set up because of all the extra emissions controls.
Hell, the reason I went with the 2.8 was that until recently you could
get an out of the box new target engine for $1600.
In article <40046B04.C03AD94C@***.net>, ßill <----------@***.net> wrote:
> You mean there's another person with the 2.8L GM engine, Chevrolet
> won't even put it in their cars?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich Hampel wrote:
> >
> > Found the cause of the paradox of rich mixture and low vacuum on my
> > 2.8L.
> > Eventually I located a teeny pin hole in the deceleration valve which
> > caused the diaphragm not to uncover the orfice plate at high vacuum.
> > The decel valve only opens at normal to high vacuum. With the valve
> > malfunctioning the engine was trying to aspirate (into the 'E' port on
> > the Rochester vari-jet) carb solely through the pcv valve ---- not
> > enough air yielded rich burn, but with the valve not working: low
> > vacuum .... thus the paradox.
> >
> > Other:
> > Stalling on left turn does NOT involve the carb float !!!!!!!!!!
> > Another anomaly also solved in the step by step search of the vacuum
> > problem (and a problem that has been posted here many many times):
> > Engine would stall when turning left (not right). The 'usual'
> > suggestion is to increase the float height in the carb ..... WRONG
> > WRONG WRONG as that will only cause the carb to dump gas into the
> > intake manifold when you shut down and totally flood it and you still
> > stall when turning left.
> > The solution is a freakin teeny pressure switch on the high pressure
> > side of power steering pump .... when the pump goes over pressure the
> > switch (also) energizes the throttle kicker. $30.00 new switch and I
> > can turn to left again!!!! You might want to remember this info for
> > those who have 2.8L engines that stall when turning left (not right).
> >
> > Anyway thanks to all who posted suggestions even that your suggestions
> > didnt work, I thank all of you for your help...... At least the
> > discussions here are extremely helpful in sorting things out. At
> > least I learned that after 300K miles you should replace the *entire*
> > emissions control system components ... its a BIG PITA if you dont. Im
> > now back to full power and 23+ mpg for long haul runs at speed.
> > Im now planning to make at least 500,000 miles on this XJ Cherokee
> > beast (- currently doing a semi-frame-off restoration). Too bad
> > DaimlerC cant build a vehicle to that standard, or without costing
> > $100,000 across the parts counter !!!!!!!!
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
The engine isnt bad at all (for what it is) its just that it needs to
be precisely set up because of all the extra emissions controls.
Hell, the reason I went with the 2.8 was that until recently you could
get an out of the box new target engine for $1600.
In article <40046B04.C03AD94C@***.net>, ßill <----------@***.net> wrote:
> You mean there's another person with the 2.8L GM engine, Chevrolet
> won't even put it in their cars?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich Hampel wrote:
> >
> > Found the cause of the paradox of rich mixture and low vacuum on my
> > 2.8L.
> > Eventually I located a teeny pin hole in the deceleration valve which
> > caused the diaphragm not to uncover the orfice plate at high vacuum.
> > The decel valve only opens at normal to high vacuum. With the valve
> > malfunctioning the engine was trying to aspirate (into the 'E' port on
> > the Rochester vari-jet) carb solely through the pcv valve ---- not
> > enough air yielded rich burn, but with the valve not working: low
> > vacuum .... thus the paradox.
> >
> > Other:
> > Stalling on left turn does NOT involve the carb float !!!!!!!!!!
> > Another anomaly also solved in the step by step search of the vacuum
> > problem (and a problem that has been posted here many many times):
> > Engine would stall when turning left (not right). The 'usual'
> > suggestion is to increase the float height in the carb ..... WRONG
> > WRONG WRONG as that will only cause the carb to dump gas into the
> > intake manifold when you shut down and totally flood it and you still
> > stall when turning left.
> > The solution is a freakin teeny pressure switch on the high pressure
> > side of power steering pump .... when the pump goes over pressure the
> > switch (also) energizes the throttle kicker. $30.00 new switch and I
> > can turn to left again!!!! You might want to remember this info for
> > those who have 2.8L engines that stall when turning left (not right).
> >
> > Anyway thanks to all who posted suggestions even that your suggestions
> > didnt work, I thank all of you for your help...... At least the
> > discussions here are extremely helpful in sorting things out. At
> > least I learned that after 300K miles you should replace the *entire*
> > emissions control system components ... its a BIG PITA if you dont. Im
> > now back to full power and 23+ mpg for long haul runs at speed.
> > Im now planning to make at least 500,000 miles on this XJ Cherokee
> > beast (- currently doing a semi-frame-off restoration). Too bad
> > DaimlerC cant build a vehicle to that standard, or without costing
> > $100,000 across the parts counter !!!!!!!!
be precisely set up because of all the extra emissions controls.
Hell, the reason I went with the 2.8 was that until recently you could
get an out of the box new target engine for $1600.
In article <40046B04.C03AD94C@***.net>, ßill <----------@***.net> wrote:
> You mean there's another person with the 2.8L GM engine, Chevrolet
> won't even put it in their cars?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich Hampel wrote:
> >
> > Found the cause of the paradox of rich mixture and low vacuum on my
> > 2.8L.
> > Eventually I located a teeny pin hole in the deceleration valve which
> > caused the diaphragm not to uncover the orfice plate at high vacuum.
> > The decel valve only opens at normal to high vacuum. With the valve
> > malfunctioning the engine was trying to aspirate (into the 'E' port on
> > the Rochester vari-jet) carb solely through the pcv valve ---- not
> > enough air yielded rich burn, but with the valve not working: low
> > vacuum .... thus the paradox.
> >
> > Other:
> > Stalling on left turn does NOT involve the carb float !!!!!!!!!!
> > Another anomaly also solved in the step by step search of the vacuum
> > problem (and a problem that has been posted here many many times):
> > Engine would stall when turning left (not right). The 'usual'
> > suggestion is to increase the float height in the carb ..... WRONG
> > WRONG WRONG as that will only cause the carb to dump gas into the
> > intake manifold when you shut down and totally flood it and you still
> > stall when turning left.
> > The solution is a freakin teeny pressure switch on the high pressure
> > side of power steering pump .... when the pump goes over pressure the
> > switch (also) energizes the throttle kicker. $30.00 new switch and I
> > can turn to left again!!!! You might want to remember this info for
> > those who have 2.8L engines that stall when turning left (not right).
> >
> > Anyway thanks to all who posted suggestions even that your suggestions
> > didnt work, I thank all of you for your help...... At least the
> > discussions here are extremely helpful in sorting things out. At
> > least I learned that after 300K miles you should replace the *entire*
> > emissions control system components ... its a BIG PITA if you dont. Im
> > now back to full power and 23+ mpg for long haul runs at speed.
> > Im now planning to make at least 500,000 miles on this XJ Cherokee
> > beast (- currently doing a semi-frame-off restoration). Too bad
> > DaimlerC cant build a vehicle to that standard, or without costing
> > $100,000 across the parts counter !!!!!!!!
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
The engine isnt bad at all (for what it is) its just that it needs to
be precisely set up because of all the extra emissions controls.
Hell, the reason I went with the 2.8 was that until recently you could
get an out of the box new target engine for $1600.
In article <40046B04.C03AD94C@***.net>, ßill <----------@***.net> wrote:
> You mean there's another person with the 2.8L GM engine, Chevrolet
> won't even put it in their cars?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich Hampel wrote:
> >
> > Found the cause of the paradox of rich mixture and low vacuum on my
> > 2.8L.
> > Eventually I located a teeny pin hole in the deceleration valve which
> > caused the diaphragm not to uncover the orfice plate at high vacuum.
> > The decel valve only opens at normal to high vacuum. With the valve
> > malfunctioning the engine was trying to aspirate (into the 'E' port on
> > the Rochester vari-jet) carb solely through the pcv valve ---- not
> > enough air yielded rich burn, but with the valve not working: low
> > vacuum .... thus the paradox.
> >
> > Other:
> > Stalling on left turn does NOT involve the carb float !!!!!!!!!!
> > Another anomaly also solved in the step by step search of the vacuum
> > problem (and a problem that has been posted here many many times):
> > Engine would stall when turning left (not right). The 'usual'
> > suggestion is to increase the float height in the carb ..... WRONG
> > WRONG WRONG as that will only cause the carb to dump gas into the
> > intake manifold when you shut down and totally flood it and you still
> > stall when turning left.
> > The solution is a freakin teeny pressure switch on the high pressure
> > side of power steering pump .... when the pump goes over pressure the
> > switch (also) energizes the throttle kicker. $30.00 new switch and I
> > can turn to left again!!!! You might want to remember this info for
> > those who have 2.8L engines that stall when turning left (not right).
> >
> > Anyway thanks to all who posted suggestions even that your suggestions
> > didnt work, I thank all of you for your help...... At least the
> > discussions here are extremely helpful in sorting things out. At
> > least I learned that after 300K miles you should replace the *entire*
> > emissions control system components ... its a BIG PITA if you dont. Im
> > now back to full power and 23+ mpg for long haul runs at speed.
> > Im now planning to make at least 500,000 miles on this XJ Cherokee
> > beast (- currently doing a semi-frame-off restoration). Too bad
> > DaimlerC cant build a vehicle to that standard, or without costing
> > $100,000 across the parts counter !!!!!!!!
be precisely set up because of all the extra emissions controls.
Hell, the reason I went with the 2.8 was that until recently you could
get an out of the box new target engine for $1600.
In article <40046B04.C03AD94C@***.net>, ßill <----------@***.net> wrote:
> You mean there's another person with the 2.8L GM engine, Chevrolet
> won't even put it in their cars?
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich Hampel wrote:
> >
> > Found the cause of the paradox of rich mixture and low vacuum on my
> > 2.8L.
> > Eventually I located a teeny pin hole in the deceleration valve which
> > caused the diaphragm not to uncover the orfice plate at high vacuum.
> > The decel valve only opens at normal to high vacuum. With the valve
> > malfunctioning the engine was trying to aspirate (into the 'E' port on
> > the Rochester vari-jet) carb solely through the pcv valve ---- not
> > enough air yielded rich burn, but with the valve not working: low
> > vacuum .... thus the paradox.
> >
> > Other:
> > Stalling on left turn does NOT involve the carb float !!!!!!!!!!
> > Another anomaly also solved in the step by step search of the vacuum
> > problem (and a problem that has been posted here many many times):
> > Engine would stall when turning left (not right). The 'usual'
> > suggestion is to increase the float height in the carb ..... WRONG
> > WRONG WRONG as that will only cause the carb to dump gas into the
> > intake manifold when you shut down and totally flood it and you still
> > stall when turning left.
> > The solution is a freakin teeny pressure switch on the high pressure
> > side of power steering pump .... when the pump goes over pressure the
> > switch (also) energizes the throttle kicker. $30.00 new switch and I
> > can turn to left again!!!! You might want to remember this info for
> > those who have 2.8L engines that stall when turning left (not right).
> >
> > Anyway thanks to all who posted suggestions even that your suggestions
> > didnt work, I thank all of you for your help...... At least the
> > discussions here are extremely helpful in sorting things out. At
> > least I learned that after 300K miles you should replace the *entire*
> > emissions control system components ... its a BIG PITA if you dont. Im
> > now back to full power and 23+ mpg for long haul runs at speed.
> > Im now planning to make at least 500,000 miles on this XJ Cherokee
> > beast (- currently doing a semi-frame-off restoration). Too bad
> > DaimlerC cant build a vehicle to that standard, or without costing
> > $100,000 across the parts counter !!!!!!!!
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
That's because your Chevy had the Buick V6:
http://www.tacreationsusa.com/images...s/38engine.JPG
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Old Crow wrote:
>
> I had an '84 S-10 4x4 2.8, 5 sp.
> Got 350,000 miles out of the rig and would still be driving it if I
> hadn't wrecked the poor thing.
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
http://www.tacreationsusa.com/images...s/38engine.JPG
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Old Crow wrote:
>
> I had an '84 S-10 4x4 2.8, 5 sp.
> Got 350,000 miles out of the rig and would still be driving it if I
> hadn't wrecked the poor thing.
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
That's because your Chevy had the Buick V6:
http://www.tacreationsusa.com/images...s/38engine.JPG
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Old Crow wrote:
>
> I had an '84 S-10 4x4 2.8, 5 sp.
> Got 350,000 miles out of the rig and would still be driving it if I
> hadn't wrecked the poor thing.
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
http://www.tacreationsusa.com/images...s/38engine.JPG
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Old Crow wrote:
>
> I had an '84 S-10 4x4 2.8, 5 sp.
> Got 350,000 miles out of the rig and would still be driving it if I
> hadn't wrecked the poor thing.
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
Guest
Posts: n/a
Re: Low vacuum rich mixture on 2.8L 86 XJ Cherokee--- solved
That's because your Chevy had the Buick V6:
http://www.tacreationsusa.com/images...s/38engine.JPG
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Old Crow wrote:
>
> I had an '84 S-10 4x4 2.8, 5 sp.
> Got 350,000 miles out of the rig and would still be driving it if I
> hadn't wrecked the poor thing.
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
http://www.tacreationsusa.com/images...s/38engine.JPG
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Old Crow wrote:
>
> I had an '84 S-10 4x4 2.8, 5 sp.
> Got 350,000 miles out of the rig and would still be driving it if I
> hadn't wrecked the poor thing.
> --
> Old Crow
> '82 Shovelhead FLT 92" 'Pearl'
> '95 Jeep YJ Rio Grande
> ASE Certified Master Auto Tech + L1
> TOMKAT, BS#133, SENS, MAMBM, DOF#51
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