86 Cherokee appears to have one dead cylinder
01-20-2004, 12:28 AM
#21
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
It's unlikely that you would do any damage driving it. You need a
compression tester to check it out any further and if you're not likely to
be doing the repair yourself you may as well have the shop that's doing the
repair confirm the diagnosis. Not a good policy to go into a shop and tell
them what's wrong, but it is good to know enough to keep from being strung
along. If it's your diagnosis and it turns out incorreft, you're liable.
If they make a mistake on the diagnosis they own part of the problem.
BTW, a bad valve spring can be hard to diagnose. The ywill often still have
enough pressure to keep the valve closed at the cranking speeds that the
comp test is done at but not when actually running. You'll show good
compression on the test but will actually be a compression problem. Almost
have to do a visual on the springs, but again, I am doubtfull about that
being your problem. Just very rare for that to occur.
Steve
<Skip> wrote in message news:bui6420246@enews4.newsguy.com...
> Is a compression test something I can do or should I just get the shop to
do
> that?
> And is it ok to drive it in this condition?
> Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> far as I can tell.
> Could hold hand on radiator for about 5 seconds no problem.
> I drove it about 50 miles roundtrip today for the muffler...
> May be burning a bit of oil today but not sure since new muffler.
> (maybe smoking from new muff)
> Dipstick showed full a few days ago and it hasn't used any oil since last
> change sometime back
> It was garaged for about 9 months after the last oil change.
>
> --
> Skip
>
>
> "Steve G" <NospamforSteve@Steve-Garner.com> wrote in message
> news:xJ0Pb.178810$X%5.123608@pd7tw2no...
> > Collapsed lifter won't cause it to miss. It will cause the valve train
to
> > clatter away but will still open the valve enough for the cyl to
> contribute.
> > Hydraulic lifter just takes up the slack, doesn't contribute to the
> opening.
> > Collapsed lifter first complaint would have been the noise. Broken valve
> > spring will cause a miss, but it's pretty uncommon. Comp test first
order
> of
> > business.
> > Steve
> > "DougW" <post.replies@invalid.address> wrote in message
> > news:fE0Pb.8609$zy3.4571@okepread01...
> > > Skip did pass the time by typing:
> > >
> > > > So it looks as though the third cylinder from front is basically
doing
> > > > nothing.
> > >
> > > Correct
> > >
> > > > Any ideas on what's up?
> > > > Mech mentioned valves, piston, and rings.
> > >
> > > Newer and I'd say stuck injector or bad harness, but an
> > > 86 is gonna be good ol Mr. Carburetor.
> > >
> > > If your piston was holed you would be getting exhaust out the
> > > dipstick tube.
> > >
> > > Collapsed lifter on the intake side of #3 would do that. If
> > > the valve isn't opening fuel isn't goin in.
> > >
> > > First up is a compression check across all cylinders. If the
> > > compression is low, squirt in some oil and run the test again.
> > > If compression picks up it's rings, if not it's valves. I doubt
> > > it's the rings, that usually results in a rough condition with
> > > lots of blowby and real dirty oil.
> > >
> > > Your probably going to have to pull the valve cover and watch
> > > as the engine turns. With luck it's just a collapsed lifter.
> > > Or maby a broken return spring on the exhaust valve..
> > >
> > > --
> > > DougW
> > >
> > >
> >
> >
>
>
compression tester to check it out any further and if you're not likely to
be doing the repair yourself you may as well have the shop that's doing the
repair confirm the diagnosis. Not a good policy to go into a shop and tell
them what's wrong, but it is good to know enough to keep from being strung
along. If it's your diagnosis and it turns out incorreft, you're liable.
If they make a mistake on the diagnosis they own part of the problem.
BTW, a bad valve spring can be hard to diagnose. The ywill often still have
enough pressure to keep the valve closed at the cranking speeds that the
comp test is done at but not when actually running. You'll show good
compression on the test but will actually be a compression problem. Almost
have to do a visual on the springs, but again, I am doubtfull about that
being your problem. Just very rare for that to occur.
Steve
<Skip> wrote in message news:bui6420246@enews4.newsguy.com...
> Is a compression test something I can do or should I just get the shop to
do
> that?
> And is it ok to drive it in this condition?
> Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> far as I can tell.
> Could hold hand on radiator for about 5 seconds no problem.
> I drove it about 50 miles roundtrip today for the muffler...
> May be burning a bit of oil today but not sure since new muffler.
> (maybe smoking from new muff)
> Dipstick showed full a few days ago and it hasn't used any oil since last
> change sometime back
> It was garaged for about 9 months after the last oil change.
>
> --
> Skip
>
>
> "Steve G" <NospamforSteve@Steve-Garner.com> wrote in message
> news:xJ0Pb.178810$X%5.123608@pd7tw2no...
> > Collapsed lifter won't cause it to miss. It will cause the valve train
to
> > clatter away but will still open the valve enough for the cyl to
> contribute.
> > Hydraulic lifter just takes up the slack, doesn't contribute to the
> opening.
> > Collapsed lifter first complaint would have been the noise. Broken valve
> > spring will cause a miss, but it's pretty uncommon. Comp test first
order
> of
> > business.
> > Steve
> > "DougW" <post.replies@invalid.address> wrote in message
> > news:fE0Pb.8609$zy3.4571@okepread01...
> > > Skip did pass the time by typing:
> > >
> > > > So it looks as though the third cylinder from front is basically
doing
> > > > nothing.
> > >
> > > Correct
> > >
> > > > Any ideas on what's up?
> > > > Mech mentioned valves, piston, and rings.
> > >
> > > Newer and I'd say stuck injector or bad harness, but an
> > > 86 is gonna be good ol Mr. Carburetor.
> > >
> > > If your piston was holed you would be getting exhaust out the
> > > dipstick tube.
> > >
> > > Collapsed lifter on the intake side of #3 would do that. If
> > > the valve isn't opening fuel isn't goin in.
> > >
> > > First up is a compression check across all cylinders. If the
> > > compression is low, squirt in some oil and run the test again.
> > > If compression picks up it's rings, if not it's valves. I doubt
> > > it's the rings, that usually results in a rough condition with
> > > lots of blowby and real dirty oil.
> > >
> > > Your probably going to have to pull the valve cover and watch
> > > as the engine turns. With luck it's just a collapsed lifter.
> > > Or maby a broken return spring on the exhaust valve..
> > >
> > > --
> > > DougW
> > >
> > >
> >
> >
>
>
01-20-2004, 12:28 AM
#22
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
It's unlikely that you would do any damage driving it. You need a
compression tester to check it out any further and if you're not likely to
be doing the repair yourself you may as well have the shop that's doing the
repair confirm the diagnosis. Not a good policy to go into a shop and tell
them what's wrong, but it is good to know enough to keep from being strung
along. If it's your diagnosis and it turns out incorreft, you're liable.
If they make a mistake on the diagnosis they own part of the problem.
BTW, a bad valve spring can be hard to diagnose. The ywill often still have
enough pressure to keep the valve closed at the cranking speeds that the
comp test is done at but not when actually running. You'll show good
compression on the test but will actually be a compression problem. Almost
have to do a visual on the springs, but again, I am doubtfull about that
being your problem. Just very rare for that to occur.
Steve
<Skip> wrote in message news:bui6420246@enews4.newsguy.com...
> Is a compression test something I can do or should I just get the shop to
do
> that?
> And is it ok to drive it in this condition?
> Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> far as I can tell.
> Could hold hand on radiator for about 5 seconds no problem.
> I drove it about 50 miles roundtrip today for the muffler...
> May be burning a bit of oil today but not sure since new muffler.
> (maybe smoking from new muff)
> Dipstick showed full a few days ago and it hasn't used any oil since last
> change sometime back
> It was garaged for about 9 months after the last oil change.
>
> --
> Skip
>
>
> "Steve G" <NospamforSteve@Steve-Garner.com> wrote in message
> news:xJ0Pb.178810$X%5.123608@pd7tw2no...
> > Collapsed lifter won't cause it to miss. It will cause the valve train
to
> > clatter away but will still open the valve enough for the cyl to
> contribute.
> > Hydraulic lifter just takes up the slack, doesn't contribute to the
> opening.
> > Collapsed lifter first complaint would have been the noise. Broken valve
> > spring will cause a miss, but it's pretty uncommon. Comp test first
order
> of
> > business.
> > Steve
> > "DougW" <post.replies@invalid.address> wrote in message
> > news:fE0Pb.8609$zy3.4571@okepread01...
> > > Skip did pass the time by typing:
> > >
> > > > So it looks as though the third cylinder from front is basically
doing
> > > > nothing.
> > >
> > > Correct
> > >
> > > > Any ideas on what's up?
> > > > Mech mentioned valves, piston, and rings.
> > >
> > > Newer and I'd say stuck injector or bad harness, but an
> > > 86 is gonna be good ol Mr. Carburetor.
> > >
> > > If your piston was holed you would be getting exhaust out the
> > > dipstick tube.
> > >
> > > Collapsed lifter on the intake side of #3 would do that. If
> > > the valve isn't opening fuel isn't goin in.
> > >
> > > First up is a compression check across all cylinders. If the
> > > compression is low, squirt in some oil and run the test again.
> > > If compression picks up it's rings, if not it's valves. I doubt
> > > it's the rings, that usually results in a rough condition with
> > > lots of blowby and real dirty oil.
> > >
> > > Your probably going to have to pull the valve cover and watch
> > > as the engine turns. With luck it's just a collapsed lifter.
> > > Or maby a broken return spring on the exhaust valve..
> > >
> > > --
> > > DougW
> > >
> > >
> >
> >
>
>
compression tester to check it out any further and if you're not likely to
be doing the repair yourself you may as well have the shop that's doing the
repair confirm the diagnosis. Not a good policy to go into a shop and tell
them what's wrong, but it is good to know enough to keep from being strung
along. If it's your diagnosis and it turns out incorreft, you're liable.
If they make a mistake on the diagnosis they own part of the problem.
BTW, a bad valve spring can be hard to diagnose. The ywill often still have
enough pressure to keep the valve closed at the cranking speeds that the
comp test is done at but not when actually running. You'll show good
compression on the test but will actually be a compression problem. Almost
have to do a visual on the springs, but again, I am doubtfull about that
being your problem. Just very rare for that to occur.
Steve
<Skip> wrote in message news:bui6420246@enews4.newsguy.com...
> Is a compression test something I can do or should I just get the shop to
do
> that?
> And is it ok to drive it in this condition?
> Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> far as I can tell.
> Could hold hand on radiator for about 5 seconds no problem.
> I drove it about 50 miles roundtrip today for the muffler...
> May be burning a bit of oil today but not sure since new muffler.
> (maybe smoking from new muff)
> Dipstick showed full a few days ago and it hasn't used any oil since last
> change sometime back
> It was garaged for about 9 months after the last oil change.
>
> --
> Skip
>
>
> "Steve G" <NospamforSteve@Steve-Garner.com> wrote in message
> news:xJ0Pb.178810$X%5.123608@pd7tw2no...
> > Collapsed lifter won't cause it to miss. It will cause the valve train
to
> > clatter away but will still open the valve enough for the cyl to
> contribute.
> > Hydraulic lifter just takes up the slack, doesn't contribute to the
> opening.
> > Collapsed lifter first complaint would have been the noise. Broken valve
> > spring will cause a miss, but it's pretty uncommon. Comp test first
order
> of
> > business.
> > Steve
> > "DougW" <post.replies@invalid.address> wrote in message
> > news:fE0Pb.8609$zy3.4571@okepread01...
> > > Skip did pass the time by typing:
> > >
> > > > So it looks as though the third cylinder from front is basically
doing
> > > > nothing.
> > >
> > > Correct
> > >
> > > > Any ideas on what's up?
> > > > Mech mentioned valves, piston, and rings.
> > >
> > > Newer and I'd say stuck injector or bad harness, but an
> > > 86 is gonna be good ol Mr. Carburetor.
> > >
> > > If your piston was holed you would be getting exhaust out the
> > > dipstick tube.
> > >
> > > Collapsed lifter on the intake side of #3 would do that. If
> > > the valve isn't opening fuel isn't goin in.
> > >
> > > First up is a compression check across all cylinders. If the
> > > compression is low, squirt in some oil and run the test again.
> > > If compression picks up it's rings, if not it's valves. I doubt
> > > it's the rings, that usually results in a rough condition with
> > > lots of blowby and real dirty oil.
> > >
> > > Your probably going to have to pull the valve cover and watch
> > > as the engine turns. With luck it's just a collapsed lifter.
> > > Or maby a broken return spring on the exhaust valve..
> > >
> > > --
> > > DougW
> > >
> > >
> >
> >
>
>
01-20-2004, 01:45 AM
#23
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>Is a compression test something I can do or should I just get the shop to do
>that?
>And is it ok to drive it in this condition?
No. You'll kill your new cat converter.
>Bucking a headwind, it struggles to break 60mph, but it's not running hot as
>far as I can tell.
>Could hold hand on radiator for about 5 seconds no problem.
>I drove it about 50 miles roundtrip today for the muffler...
>May be burning a bit of oil today but not sure since new muffler.
>(maybe smoking from new muff)
>Dipstick showed full a few days ago and it hasn't used any oil since last
>change sometime back
>It was garaged for about 9 months after the last oil change.
>Is a compression test something I can do or should I just get the shop to do
>that?
>And is it ok to drive it in this condition?
No. You'll kill your new cat converter.
>Bucking a headwind, it struggles to break 60mph, but it's not running hot as
>far as I can tell.
>Could hold hand on radiator for about 5 seconds no problem.
>I drove it about 50 miles roundtrip today for the muffler...
>May be burning a bit of oil today but not sure since new muffler.
>(maybe smoking from new muff)
>Dipstick showed full a few days ago and it hasn't used any oil since last
>change sometime back
>It was garaged for about 9 months after the last oil change.
01-20-2004, 01:45 AM
#24
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>Is a compression test something I can do or should I just get the shop to do
>that?
>And is it ok to drive it in this condition?
No. You'll kill your new cat converter.
>Bucking a headwind, it struggles to break 60mph, but it's not running hot as
>far as I can tell.
>Could hold hand on radiator for about 5 seconds no problem.
>I drove it about 50 miles roundtrip today for the muffler...
>May be burning a bit of oil today but not sure since new muffler.
>(maybe smoking from new muff)
>Dipstick showed full a few days ago and it hasn't used any oil since last
>change sometime back
>It was garaged for about 9 months after the last oil change.
>Is a compression test something I can do or should I just get the shop to do
>that?
>And is it ok to drive it in this condition?
No. You'll kill your new cat converter.
>Bucking a headwind, it struggles to break 60mph, but it's not running hot as
>far as I can tell.
>Could hold hand on radiator for about 5 seconds no problem.
>I drove it about 50 miles roundtrip today for the muffler...
>May be burning a bit of oil today but not sure since new muffler.
>(maybe smoking from new muff)
>Dipstick showed full a few days ago and it hasn't used any oil since last
>change sometime back
>It was garaged for about 9 months after the last oil change.
01-20-2004, 01:45 AM
#25
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>Is a compression test something I can do or should I just get the shop to do
>that?
>And is it ok to drive it in this condition?
No. You'll kill your new cat converter.
>Bucking a headwind, it struggles to break 60mph, but it's not running hot as
>far as I can tell.
>Could hold hand on radiator for about 5 seconds no problem.
>I drove it about 50 miles roundtrip today for the muffler...
>May be burning a bit of oil today but not sure since new muffler.
>(maybe smoking from new muff)
>Dipstick showed full a few days ago and it hasn't used any oil since last
>change sometime back
>It was garaged for about 9 months after the last oil change.
>Is a compression test something I can do or should I just get the shop to do
>that?
>And is it ok to drive it in this condition?
No. You'll kill your new cat converter.
>Bucking a headwind, it struggles to break 60mph, but it's not running hot as
>far as I can tell.
>Could hold hand on radiator for about 5 seconds no problem.
>I drove it about 50 miles roundtrip today for the muffler...
>May be burning a bit of oil today but not sure since new muffler.
>(maybe smoking from new muff)
>Dipstick showed full a few days ago and it hasn't used any oil since last
>change sometime back
>It was garaged for about 9 months after the last oil change.
01-20-2004, 12:09 PM
#26
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
Absolutely right, my error. Was focused on internal engine damage and
didn't think about raw HC's.
"bllsht" <nospam@invaliddot.net> wrote in message
news:rt7s009vvh7ks6vprmvcc6nh24ignvp4kb@4ax.com...
> In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>
> >Is a compression test something I can do or should I just get the shop to
do
> >that?
> >And is it ok to drive it in this condition?
>
> No. You'll kill your new cat converter.
>
> >Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> >far as I can tell.
> >Could hold hand on radiator for about 5 seconds no problem.
> >I drove it about 50 miles roundtrip today for the muffler...
> >May be burning a bit of oil today but not sure since new muffler.
> >(maybe smoking from new muff)
> >Dipstick showed full a few days ago and it hasn't used any oil since last
> >change sometime back
> >It was garaged for about 9 months after the last oil change.
>
didn't think about raw HC's.
"bllsht" <nospam@invaliddot.net> wrote in message
news:rt7s009vvh7ks6vprmvcc6nh24ignvp4kb@4ax.com...
> In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>
> >Is a compression test something I can do or should I just get the shop to
do
> >that?
> >And is it ok to drive it in this condition?
>
> No. You'll kill your new cat converter.
>
> >Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> >far as I can tell.
> >Could hold hand on radiator for about 5 seconds no problem.
> >I drove it about 50 miles roundtrip today for the muffler...
> >May be burning a bit of oil today but not sure since new muffler.
> >(maybe smoking from new muff)
> >Dipstick showed full a few days ago and it hasn't used any oil since last
> >change sometime back
> >It was garaged for about 9 months after the last oil change.
>
01-20-2004, 12:09 PM
#27
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
Absolutely right, my error. Was focused on internal engine damage and
didn't think about raw HC's.
"bllsht" <nospam@invaliddot.net> wrote in message
news:rt7s009vvh7ks6vprmvcc6nh24ignvp4kb@4ax.com...
> In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>
> >Is a compression test something I can do or should I just get the shop to
do
> >that?
> >And is it ok to drive it in this condition?
>
> No. You'll kill your new cat converter.
>
> >Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> >far as I can tell.
> >Could hold hand on radiator for about 5 seconds no problem.
> >I drove it about 50 miles roundtrip today for the muffler...
> >May be burning a bit of oil today but not sure since new muffler.
> >(maybe smoking from new muff)
> >Dipstick showed full a few days ago and it hasn't used any oil since last
> >change sometime back
> >It was garaged for about 9 months after the last oil change.
>
didn't think about raw HC's.
"bllsht" <nospam@invaliddot.net> wrote in message
news:rt7s009vvh7ks6vprmvcc6nh24ignvp4kb@4ax.com...
> In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>
> >Is a compression test something I can do or should I just get the shop to
do
> >that?
> >And is it ok to drive it in this condition?
>
> No. You'll kill your new cat converter.
>
> >Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> >far as I can tell.
> >Could hold hand on radiator for about 5 seconds no problem.
> >I drove it about 50 miles roundtrip today for the muffler...
> >May be burning a bit of oil today but not sure since new muffler.
> >(maybe smoking from new muff)
> >Dipstick showed full a few days ago and it hasn't used any oil since last
> >change sometime back
> >It was garaged for about 9 months after the last oil change.
>
01-20-2004, 12:09 PM
#28
Guest
Posts: n/a
Re: 86 Cherokee appears to have one dead cylinder
Absolutely right, my error. Was focused on internal engine damage and
didn't think about raw HC's.
"bllsht" <nospam@invaliddot.net> wrote in message
news:rt7s009vvh7ks6vprmvcc6nh24ignvp4kb@4ax.com...
> In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>
> >Is a compression test something I can do or should I just get the shop to
do
> >that?
> >And is it ok to drive it in this condition?
>
> No. You'll kill your new cat converter.
>
> >Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> >far as I can tell.
> >Could hold hand on radiator for about 5 seconds no problem.
> >I drove it about 50 miles roundtrip today for the muffler...
> >May be burning a bit of oil today but not sure since new muffler.
> >(maybe smoking from new muff)
> >Dipstick showed full a few days ago and it hasn't used any oil since last
> >change sometime back
> >It was garaged for about 9 months after the last oil change.
>
didn't think about raw HC's.
"bllsht" <nospam@invaliddot.net> wrote in message
news:rt7s009vvh7ks6vprmvcc6nh24ignvp4kb@4ax.com...
> In message <bui6420246@enews4.newsguy.com>, "<Skip>" wrote:
>
> >Is a compression test something I can do or should I just get the shop to
do
> >that?
> >And is it ok to drive it in this condition?
>
> No. You'll kill your new cat converter.
>
> >Bucking a headwind, it struggles to break 60mph, but it's not running hot
as
> >far as I can tell.
> >Could hold hand on radiator for about 5 seconds no problem.
> >I drove it about 50 miles roundtrip today for the muffler...
> >May be burning a bit of oil today but not sure since new muffler.
> >(maybe smoking from new muff)
> >Dipstick showed full a few days ago and it hasn't used any oil since last
> >change sometime back
> >It was garaged for about 9 months after the last oil change.
>
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