Don Smith

Hi Dave Just went through and did a valve job and head shave to ensure it
is not warped. New plugs, 160 lbs compression on all cylinders, good wires,
etc. When I checked the Throttle Body Injection system I found that the
large "O" ring was missing. I installed a teflon one around the injector
body below the centering ring. ( Should it be above the ring???)

Getting ready to install a new fuel filter but do not expect that to help
much. Starting to suspect something in the Injection system or its parts.
Thanks again Don

"dave AKA vwdoc1" <NO_vwdoc1_SPAM_@hotmail.com_PLEASE> wrote in message
news:VIdVc.3473$ZC7.550@newssvr19.news.prodigy.com ...
> Did you check on the basics?
> How is the compression of the engine?
> How is the tune and what do the plugs look like?
>
> I had an '87 XJ with the 2.5 engine with the 4 speed manual transmission
and
> it was slow. Even after a good tune up and a tight engine, it was still
> weak on power and just plain slow.
> It would get up to speed but if I was even towing an almost empty trailer
it
> would slow down going up a slight incline. :-( I had to downshift to
keep
> the engine in a good 'powerband'.
>
> Of course your problem may be weak spark, too much or too little fuel, or
a
> tired engine. :-(
> I sold my 87 XJ when I got my 88 XJ running. ;-)
>
> good luck!
> --
> later,
> dave AKA vwdoc1
> 88 XJ 4.0 auto
> 82 Wag Ltd. 360 auto (parts truck)
> 88 FSJ-GW 360 auto (GRAND 88)
> Chicago
>
> "Don Smith" <desmith@innercite.com> wrote in message
> news:10i9ttv1899s814@corp.supernews.com...
> >
> >
> > Hi all Back again. I am still having problems getting my 1986 Cherokee
> > Pioneer with 2.46L engine and Throttle Body Injection, to give a smooth
> > acceleration under load. Seems to be more pronounced during the lower
> part
> > of the power curve. Downhill it seems to have great acceleration. (No
> > Jokes Please) When it starts up a hill it slows down and depressing the
> > accelerator pedal seems to make it bog down worse. Depressing the pedal
> to
> > the floor seems to really cause it to bog down. If I downshift to a
lower
> > gear and get the RPMs up it seems to be better. But with many hills I
have
> > to go down two or more gears to even get it over the hill. The hills
are
> > not all that great. Have tried changing the Map Sensor, checking the
> hose
> > connections around the TBI for vacuum leaks, all hoses for good
> connections
> > and proper placement. When I remove the injector from the Throttle Body
I
> > found only one small O Ring at the bottom. (My manual shows two. One
near
> > the top of the body) I tried replacing it but still have same results.
> Any
> > suggestions of something I might check and/or have missed? Is there any
> > computer codes used on this model that might give me some clues as to
the
> > problem? One again thanks for all of your help. Don Smith
> >
>
>


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Mike Romain

The fact that the TB is put together wrong means someone has already had
the problems you are experiencing and has tried messing around. Running
way too lean will burn out valves.

That gas filter might just be the ticket.

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

Don Smith wrote:
>
> Hi Dave Just went through and did a valve job and head shave to ensure it
> is not warped. New plugs, 160 lbs compression on all cylinders, good wires,
> etc. When I checked the Throttle Body Injection system I found that the
> large "O" ring was missing. I installed a teflon one around the injector
> body below the centering ring. ( Should it be above the ring???)
>
> Getting ready to install a new fuel filter but do not expect that to help
> much. Starting to suspect something in the Injection system or its parts.
> Thanks again Don
>
> "dave AKA vwdoc1" <NO_vwdoc1_SPAM_@hotmail.com_PLEASE> wrote in message
> news:VIdVc.3473$ZC7.550@newssvr19.news.prodigy.com ...
> > Did you check on the basics?
> > How is the compression of the engine?
> > How is the tune and what do the plugs look like?
> >
> > I had an '87 XJ with the 2.5 engine with the 4 speed manual transmission
> and
> > it was slow. Even after a good tune up and a tight engine, it was still
> > weak on power and just plain slow.
> > It would get up to speed but if I was even towing an almost empty trailer
> it
> > would slow down going up a slight incline. :-( I had to downshift to
> keep
> > the engine in a good 'powerband'.
> >
> > Of course your problem may be weak spark, too much or too little fuel, or
> a
> > tired engine. :-(
> > I sold my 87 XJ when I got my 88 XJ running. ;-)
> >
> > good luck!
> > --
> > later,
> > dave AKA vwdoc1
> > 88 XJ 4.0 auto
> > 82 Wag Ltd. 360 auto (parts truck)
> > 88 FSJ-GW 360 auto (GRAND 88)
> > Chicago
> >
> > "Don Smith" <desmith@innercite.com> wrote in message
> > news:10i9ttv1899s814@corp.supernews.com...
> > >
> > >
> > > Hi all Back again. I am still having problems getting my 1986 Cherokee
> > > Pioneer with 2.46L engine and Throttle Body Injection, to give a smooth
> > > acceleration under load. Seems to be more pronounced during the lower
> > part
> > > of the power curve. Downhill it seems to have great acceleration. (No
> > > Jokes Please) When it starts up a hill it slows down and depressing the
> > > accelerator pedal seems to make it bog down worse. Depressing the pedal
> > to
> > > the floor seems to really cause it to bog down. If I downshift to a
> lower
> > > gear and get the RPMs up it seems to be better. But with many hills I
> have
> > > to go down two or more gears to even get it over the hill. The hills
> are
> > > not all that great. Have tried changing the Map Sensor, checking the
> > hose
> > > connections around the TBI for vacuum leaks, all hoses for good
> > connections
> > > and proper placement. When I remove the injector from the Throttle Body
> I
> > > found only one small O Ring at the bottom. (My manual shows two. One
> near
> > > the top of the body) I tried replacing it but still have same results.
> > Any
> > > suggestions of something I might check and/or have missed? Is there any
> > > computer codes used on this model that might give me some clues as to
> the
> > > problem? One again thanks for all of your help. Don Smith
> > >
> >
> >
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.740 / Virus Database: 494 - Release Date: 8/16/04

Mike Romain

The fact that the TB is put together wrong means someone has already had
the problems you are experiencing and has tried messing around. Running
way too lean will burn out valves.

That gas filter might just be the ticket.

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

Don Smith wrote:
>
> Hi Dave Just went through and did a valve job and head shave to ensure it
> is not warped. New plugs, 160 lbs compression on all cylinders, good wires,
> etc. When I checked the Throttle Body Injection system I found that the
> large "O" ring was missing. I installed a teflon one around the injector
> body below the centering ring. ( Should it be above the ring???)
>
> Getting ready to install a new fuel filter but do not expect that to help
> much. Starting to suspect something in the Injection system or its parts.
> Thanks again Don
>
> "dave AKA vwdoc1" <NO_vwdoc1_SPAM_@hotmail.com_PLEASE> wrote in message
> news:VIdVc.3473$ZC7.550@newssvr19.news.prodigy.com ...
> > Did you check on the basics?
> > How is the compression of the engine?
> > How is the tune and what do the plugs look like?
> >
> > I had an '87 XJ with the 2.5 engine with the 4 speed manual transmission
> and
> > it was slow. Even after a good tune up and a tight engine, it was still
> > weak on power and just plain slow.
> > It would get up to speed but if I was even towing an almost empty trailer
> it
> > would slow down going up a slight incline. :-( I had to downshift to
> keep
> > the engine in a good 'powerband'.
> >
> > Of course your problem may be weak spark, too much or too little fuel, or
> a
> > tired engine. :-(
> > I sold my 87 XJ when I got my 88 XJ running. ;-)
> >
> > good luck!
> > --
> > later,
> > dave AKA vwdoc1
> > 88 XJ 4.0 auto
> > 82 Wag Ltd. 360 auto (parts truck)
> > 88 FSJ-GW 360 auto (GRAND 88)
> > Chicago
> >
> > "Don Smith" <desmith@innercite.com> wrote in message
> > news:10i9ttv1899s814@corp.supernews.com...
> > >
> > >
> > > Hi all Back again. I am still having problems getting my 1986 Cherokee
> > > Pioneer with 2.46L engine and Throttle Body Injection, to give a smooth
> > > acceleration under load. Seems to be more pronounced during the lower
> > part
> > > of the power curve. Downhill it seems to have great acceleration. (No
> > > Jokes Please) When it starts up a hill it slows down and depressing the
> > > accelerator pedal seems to make it bog down worse. Depressing the pedal
> > to
> > > the floor seems to really cause it to bog down. If I downshift to a
> lower
> > > gear and get the RPMs up it seems to be better. But with many hills I
> have
> > > to go down two or more gears to even get it over the hill. The hills
> are
> > > not all that great. Have tried changing the Map Sensor, checking the
> > hose
> > > connections around the TBI for vacuum leaks, all hoses for good
> > connections
> > > and proper placement. When I remove the injector from the Throttle Body
> I
> > > found only one small O Ring at the bottom. (My manual shows two. One
> near
> > > the top of the body) I tried replacing it but still have same results.
> > Any
> > > suggestions of something I might check and/or have missed? Is there any
> > > computer codes used on this model that might give me some clues as to
> the
> > > problem? One again thanks for all of your help. Don Smith
> > >
> >
> >
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.740 / Virus Database: 494 - Release Date: 8/16/04

Mike Romain

The fact that the TB is put together wrong means someone has already had
the problems you are experiencing and has tried messing around. Running
way too lean will burn out valves.

That gas filter might just be the ticket.

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

Don Smith wrote:
>
> Hi Dave Just went through and did a valve job and head shave to ensure it
> is not warped. New plugs, 160 lbs compression on all cylinders, good wires,
> etc. When I checked the Throttle Body Injection system I found that the
> large "O" ring was missing. I installed a teflon one around the injector
> body below the centering ring. ( Should it be above the ring???)
>
> Getting ready to install a new fuel filter but do not expect that to help
> much. Starting to suspect something in the Injection system or its parts.
> Thanks again Don
>
> "dave AKA vwdoc1" <NO_vwdoc1_SPAM_@hotmail.com_PLEASE> wrote in message
> news:VIdVc.3473$ZC7.550@newssvr19.news.prodigy.com ...
> > Did you check on the basics?
> > How is the compression of the engine?
> > How is the tune and what do the plugs look like?
> >
> > I had an '87 XJ with the 2.5 engine with the 4 speed manual transmission
> and
> > it was slow. Even after a good tune up and a tight engine, it was still
> > weak on power and just plain slow.
> > It would get up to speed but if I was even towing an almost empty trailer
> it
> > would slow down going up a slight incline. :-( I had to downshift to
> keep
> > the engine in a good 'powerband'.
> >
> > Of course your problem may be weak spark, too much or too little fuel, or
> a
> > tired engine. :-(
> > I sold my 87 XJ when I got my 88 XJ running. ;-)
> >
> > good luck!
> > --
> > later,
> > dave AKA vwdoc1
> > 88 XJ 4.0 auto
> > 82 Wag Ltd. 360 auto (parts truck)
> > 88 FSJ-GW 360 auto (GRAND 88)
> > Chicago
> >
> > "Don Smith" <desmith@innercite.com> wrote in message
> > news:10i9ttv1899s814@corp.supernews.com...
> > >
> > >
> > > Hi all Back again. I am still having problems getting my 1986 Cherokee
> > > Pioneer with 2.46L engine and Throttle Body Injection, to give a smooth
> > > acceleration under load. Seems to be more pronounced during the lower
> > part
> > > of the power curve. Downhill it seems to have great acceleration. (No
> > > Jokes Please) When it starts up a hill it slows down and depressing the
> > > accelerator pedal seems to make it bog down worse. Depressing the pedal
> > to
> > > the floor seems to really cause it to bog down. If I downshift to a
> lower
> > > gear and get the RPMs up it seems to be better. But with many hills I
> have
> > > to go down two or more gears to even get it over the hill. The hills
> are
> > > not all that great. Have tried changing the Map Sensor, checking the
> > hose
> > > connections around the TBI for vacuum leaks, all hoses for good
> > connections
> > > and proper placement. When I remove the injector from the Throttle Body
> I
> > > found only one small O Ring at the bottom. (My manual shows two. One
> near
> > > the top of the body) I tried replacing it but still have same results.
> > Any
> > > suggestions of something I might check and/or have missed? Is there any
> > > computer codes used on this model that might give me some clues as to
> the
> > > problem? One again thanks for all of your help. Don Smith
> > >
> >
> >
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.740 / Virus Database: 494 - Release Date: 8/16/04

Mike Romain

The fact that the TB is put together wrong means someone has already had
the problems you are experiencing and has tried messing around. Running
way too lean will burn out valves.

That gas filter might just be the ticket.

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

Don Smith wrote:
>
> Hi Dave Just went through and did a valve job and head shave to ensure it
> is not warped. New plugs, 160 lbs compression on all cylinders, good wires,
> etc. When I checked the Throttle Body Injection system I found that the
> large "O" ring was missing. I installed a teflon one around the injector
> body below the centering ring. ( Should it be above the ring???)
>
> Getting ready to install a new fuel filter but do not expect that to help
> much. Starting to suspect something in the Injection system or its parts.
> Thanks again Don
>
> "dave AKA vwdoc1" <NO_vwdoc1_SPAM_@hotmail.com_PLEASE> wrote in message
> news:VIdVc.3473$ZC7.550@newssvr19.news.prodigy.com ...
> > Did you check on the basics?
> > How is the compression of the engine?
> > How is the tune and what do the plugs look like?
> >
> > I had an '87 XJ with the 2.5 engine with the 4 speed manual transmission
> and
> > it was slow. Even after a good tune up and a tight engine, it was still
> > weak on power and just plain slow.
> > It would get up to speed but if I was even towing an almost empty trailer
> it
> > would slow down going up a slight incline. :-( I had to downshift to
> keep
> > the engine in a good 'powerband'.
> >
> > Of course your problem may be weak spark, too much or too little fuel, or
> a
> > tired engine. :-(
> > I sold my 87 XJ when I got my 88 XJ running. ;-)
> >
> > good luck!
> > --
> > later,
> > dave AKA vwdoc1
> > 88 XJ 4.0 auto
> > 82 Wag Ltd. 360 auto (parts truck)
> > 88 FSJ-GW 360 auto (GRAND 88)
> > Chicago
> >
> > "Don Smith" <desmith@innercite.com> wrote in message
> > news:10i9ttv1899s814@corp.supernews.com...
> > >
> > >
> > > Hi all Back again. I am still having problems getting my 1986 Cherokee
> > > Pioneer with 2.46L engine and Throttle Body Injection, to give a smooth
> > > acceleration under load. Seems to be more pronounced during the lower
> > part
> > > of the power curve. Downhill it seems to have great acceleration. (No
> > > Jokes Please) When it starts up a hill it slows down and depressing the
> > > accelerator pedal seems to make it bog down worse. Depressing the pedal
> > to
> > > the floor seems to really cause it to bog down. If I downshift to a
> lower
> > > gear and get the RPMs up it seems to be better. But with many hills I
> have
> > > to go down two or more gears to even get it over the hill. The hills
> are
> > > not all that great. Have tried changing the Map Sensor, checking the
> > hose
> > > connections around the TBI for vacuum leaks, all hoses for good
> > connections
> > > and proper placement. When I remove the injector from the Throttle Body
> I
> > > found only one small O Ring at the bottom. (My manual shows two. One
> near
> > > the top of the body) I tried replacing it but still have same results.
> > Any
> > > suggestions of something I might check and/or have missed? Is there any
> > > computer codes used on this model that might give me some clues as to
> the
> > > problem? One again thanks for all of your help. Don Smith
> > >
> >
> >
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.740 / Virus Database: 494 - Release Date: 8/16/04