Compression testing
01-08-2004, 05:57 PM
#1
Guest
Posts: n/a
Compression testing
Ok, I have a compression gauge but haven't used it yet.
Can someone outline the steps and what the correct compression on a 258
should be?
1. Should I remove all spark plugs when testing compression?
2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
doesn't go in the cylinder when testing?
3. I hook the compression gauge into the spark plug hole. How many times do
I turn the engine?
Thanks for any details.
Bill
Can someone outline the steps and what the correct compression on a 258
should be?
1. Should I remove all spark plugs when testing compression?
2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
doesn't go in the cylinder when testing?
3. I hook the compression gauge into the spark plug hole. How many times do
I turn the engine?
Thanks for any details.
Bill
01-08-2004, 06:34 PM
#2
Guest
Posts: n/a
Re: Compression testing
William Oliveri did pass the time by typing:
> Ok, I have a compression gauge but haven't used it yet.
>
> Can someone outline the steps and what the correct compression on a 258
> should be?
Dunno
> 1. Should I remove all spark plugs when testing compression?
You could. I usually do a quick comression test when changing plugs.
Removing the plugs lets the engine crank easier.
> 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> doesn't go in the cylinder when testing?
Pull the fuse for your fuel pump.
Don't forget to disconnect the coil signal. :)
> 3. I hook the compression gauge into the spark plug hole. How many times do
> I turn the engine?
Till the numbers stop climbing (4-5 compression strokes)
http://www.georgiazclub.com/tips/ztech/comptest.htm
is fairly good although I'm not so sure about step3
(running the engine with plugs loose)
--
DougW
> Ok, I have a compression gauge but haven't used it yet.
>
> Can someone outline the steps and what the correct compression on a 258
> should be?
Dunno
> 1. Should I remove all spark plugs when testing compression?
You could. I usually do a quick comression test when changing plugs.
Removing the plugs lets the engine crank easier.
> 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> doesn't go in the cylinder when testing?
Pull the fuse for your fuel pump.
Don't forget to disconnect the coil signal. :)
> 3. I hook the compression gauge into the spark plug hole. How many times do
> I turn the engine?
Till the numbers stop climbing (4-5 compression strokes)
http://www.georgiazclub.com/tips/ztech/comptest.htm
is fairly good although I'm not so sure about step3
(running the engine with plugs loose)
--
DougW
01-08-2004, 06:34 PM
#3
Guest
Posts: n/a
Re: Compression testing
William Oliveri did pass the time by typing:
> Ok, I have a compression gauge but haven't used it yet.
>
> Can someone outline the steps and what the correct compression on a 258
> should be?
Dunno
> 1. Should I remove all spark plugs when testing compression?
You could. I usually do a quick comression test when changing plugs.
Removing the plugs lets the engine crank easier.
> 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> doesn't go in the cylinder when testing?
Pull the fuse for your fuel pump.
Don't forget to disconnect the coil signal. :)
> 3. I hook the compression gauge into the spark plug hole. How many times do
> I turn the engine?
Till the numbers stop climbing (4-5 compression strokes)
http://www.georgiazclub.com/tips/ztech/comptest.htm
is fairly good although I'm not so sure about step3
(running the engine with plugs loose)
--
DougW
> Ok, I have a compression gauge but haven't used it yet.
>
> Can someone outline the steps and what the correct compression on a 258
> should be?
Dunno
> 1. Should I remove all spark plugs when testing compression?
You could. I usually do a quick comression test when changing plugs.
Removing the plugs lets the engine crank easier.
> 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> doesn't go in the cylinder when testing?
Pull the fuse for your fuel pump.
Don't forget to disconnect the coil signal. :)
> 3. I hook the compression gauge into the spark plug hole. How many times do
> I turn the engine?
Till the numbers stop climbing (4-5 compression strokes)
http://www.georgiazclub.com/tips/ztech/comptest.htm
is fairly good although I'm not so sure about step3
(running the engine with plugs loose)
--
DougW
01-08-2004, 06:34 PM
#4
Guest
Posts: n/a
Re: Compression testing
William Oliveri did pass the time by typing:
> Ok, I have a compression gauge but haven't used it yet.
>
> Can someone outline the steps and what the correct compression on a 258
> should be?
Dunno
> 1. Should I remove all spark plugs when testing compression?
You could. I usually do a quick comression test when changing plugs.
Removing the plugs lets the engine crank easier.
> 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> doesn't go in the cylinder when testing?
Pull the fuse for your fuel pump.
Don't forget to disconnect the coil signal. :)
> 3. I hook the compression gauge into the spark plug hole. How many times do
> I turn the engine?
Till the numbers stop climbing (4-5 compression strokes)
http://www.georgiazclub.com/tips/ztech/comptest.htm
is fairly good although I'm not so sure about step3
(running the engine with plugs loose)
--
DougW
> Ok, I have a compression gauge but haven't used it yet.
>
> Can someone outline the steps and what the correct compression on a 258
> should be?
Dunno
> 1. Should I remove all spark plugs when testing compression?
You could. I usually do a quick comression test when changing plugs.
Removing the plugs lets the engine crank easier.
> 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> doesn't go in the cylinder when testing?
Pull the fuse for your fuel pump.
Don't forget to disconnect the coil signal. :)
> 3. I hook the compression gauge into the spark plug hole. How many times do
> I turn the engine?
Till the numbers stop climbing (4-5 compression strokes)
http://www.georgiazclub.com/tips/ztech/comptest.htm
is fairly good although I'm not so sure about step3
(running the engine with plugs loose)
--
DougW
01-09-2004, 02:40 AM
#5
Guest
Posts: n/a
Re: Compression testing
Thanks,
I found in my FSM that the pressure for a 6 cylinder should be between 120
and 140 psi.
One thing I don't understand is why should the throttle be wide open
position when fuel pump and coil are dis-engaged?
What does the throttle have to do with anything when testing cylinder
compression?
Thanks,
Bill
"DougW" <post.replies@invalid.address> wrote in message
news:0OlLb.57344$PK3.46808@okepread01...
> William Oliveri did pass the time by typing:
> > Ok, I have a compression gauge but haven't used it yet.
> >
> > Can someone outline the steps and what the correct compression on a 258
> > should be?
>
> Dunno
>
> > 1. Should I remove all spark plugs when testing compression?
>
> You could. I usually do a quick comression test when changing plugs.
> Removing the plugs lets the engine crank easier.
>
> > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > doesn't go in the cylinder when testing?
>
> Pull the fuse for your fuel pump.
>
> Don't forget to disconnect the coil signal. :)
>
> > 3. I hook the compression gauge into the spark plug hole. How many
times do
> > I turn the engine?
>
> Till the numbers stop climbing (4-5 compression strokes)
>
> http://www.georgiazclub.com/tips/ztech/comptest.htm
> is fairly good although I'm not so sure about step3
> (running the engine with plugs loose)
>
> --
> DougW
>
>
>
I found in my FSM that the pressure for a 6 cylinder should be between 120
and 140 psi.
One thing I don't understand is why should the throttle be wide open
position when fuel pump and coil are dis-engaged?
What does the throttle have to do with anything when testing cylinder
compression?
Thanks,
Bill
"DougW" <post.replies@invalid.address> wrote in message
news:0OlLb.57344$PK3.46808@okepread01...
> William Oliveri did pass the time by typing:
> > Ok, I have a compression gauge but haven't used it yet.
> >
> > Can someone outline the steps and what the correct compression on a 258
> > should be?
>
> Dunno
>
> > 1. Should I remove all spark plugs when testing compression?
>
> You could. I usually do a quick comression test when changing plugs.
> Removing the plugs lets the engine crank easier.
>
> > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > doesn't go in the cylinder when testing?
>
> Pull the fuse for your fuel pump.
>
> Don't forget to disconnect the coil signal. :)
>
> > 3. I hook the compression gauge into the spark plug hole. How many
times do
> > I turn the engine?
>
> Till the numbers stop climbing (4-5 compression strokes)
>
> http://www.georgiazclub.com/tips/ztech/comptest.htm
> is fairly good although I'm not so sure about step3
> (running the engine with plugs loose)
>
> --
> DougW
>
>
>
01-09-2004, 02:40 AM
#6
Guest
Posts: n/a
Re: Compression testing
Thanks,
I found in my FSM that the pressure for a 6 cylinder should be between 120
and 140 psi.
One thing I don't understand is why should the throttle be wide open
position when fuel pump and coil are dis-engaged?
What does the throttle have to do with anything when testing cylinder
compression?
Thanks,
Bill
"DougW" <post.replies@invalid.address> wrote in message
news:0OlLb.57344$PK3.46808@okepread01...
> William Oliveri did pass the time by typing:
> > Ok, I have a compression gauge but haven't used it yet.
> >
> > Can someone outline the steps and what the correct compression on a 258
> > should be?
>
> Dunno
>
> > 1. Should I remove all spark plugs when testing compression?
>
> You could. I usually do a quick comression test when changing plugs.
> Removing the plugs lets the engine crank easier.
>
> > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > doesn't go in the cylinder when testing?
>
> Pull the fuse for your fuel pump.
>
> Don't forget to disconnect the coil signal. :)
>
> > 3. I hook the compression gauge into the spark plug hole. How many
times do
> > I turn the engine?
>
> Till the numbers stop climbing (4-5 compression strokes)
>
> http://www.georgiazclub.com/tips/ztech/comptest.htm
> is fairly good although I'm not so sure about step3
> (running the engine with plugs loose)
>
> --
> DougW
>
>
>
I found in my FSM that the pressure for a 6 cylinder should be between 120
and 140 psi.
One thing I don't understand is why should the throttle be wide open
position when fuel pump and coil are dis-engaged?
What does the throttle have to do with anything when testing cylinder
compression?
Thanks,
Bill
"DougW" <post.replies@invalid.address> wrote in message
news:0OlLb.57344$PK3.46808@okepread01...
> William Oliveri did pass the time by typing:
> > Ok, I have a compression gauge but haven't used it yet.
> >
> > Can someone outline the steps and what the correct compression on a 258
> > should be?
>
> Dunno
>
> > 1. Should I remove all spark plugs when testing compression?
>
> You could. I usually do a quick comression test when changing plugs.
> Removing the plugs lets the engine crank easier.
>
> > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > doesn't go in the cylinder when testing?
>
> Pull the fuse for your fuel pump.
>
> Don't forget to disconnect the coil signal. :)
>
> > 3. I hook the compression gauge into the spark plug hole. How many
times do
> > I turn the engine?
>
> Till the numbers stop climbing (4-5 compression strokes)
>
> http://www.georgiazclub.com/tips/ztech/comptest.htm
> is fairly good although I'm not so sure about step3
> (running the engine with plugs loose)
>
> --
> DougW
>
>
>
01-09-2004, 02:40 AM
#7
Guest
Posts: n/a
Re: Compression testing
Thanks,
I found in my FSM that the pressure for a 6 cylinder should be between 120
and 140 psi.
One thing I don't understand is why should the throttle be wide open
position when fuel pump and coil are dis-engaged?
What does the throttle have to do with anything when testing cylinder
compression?
Thanks,
Bill
"DougW" <post.replies@invalid.address> wrote in message
news:0OlLb.57344$PK3.46808@okepread01...
> William Oliveri did pass the time by typing:
> > Ok, I have a compression gauge but haven't used it yet.
> >
> > Can someone outline the steps and what the correct compression on a 258
> > should be?
>
> Dunno
>
> > 1. Should I remove all spark plugs when testing compression?
>
> You could. I usually do a quick comression test when changing plugs.
> Removing the plugs lets the engine crank easier.
>
> > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > doesn't go in the cylinder when testing?
>
> Pull the fuse for your fuel pump.
>
> Don't forget to disconnect the coil signal. :)
>
> > 3. I hook the compression gauge into the spark plug hole. How many
times do
> > I turn the engine?
>
> Till the numbers stop climbing (4-5 compression strokes)
>
> http://www.georgiazclub.com/tips/ztech/comptest.htm
> is fairly good although I'm not so sure about step3
> (running the engine with plugs loose)
>
> --
> DougW
>
>
>
I found in my FSM that the pressure for a 6 cylinder should be between 120
and 140 psi.
One thing I don't understand is why should the throttle be wide open
position when fuel pump and coil are dis-engaged?
What does the throttle have to do with anything when testing cylinder
compression?
Thanks,
Bill
"DougW" <post.replies@invalid.address> wrote in message
news:0OlLb.57344$PK3.46808@okepread01...
> William Oliveri did pass the time by typing:
> > Ok, I have a compression gauge but haven't used it yet.
> >
> > Can someone outline the steps and what the correct compression on a 258
> > should be?
>
> Dunno
>
> > 1. Should I remove all spark plugs when testing compression?
>
> You could. I usually do a quick comression test when changing plugs.
> Removing the plugs lets the engine crank easier.
>
> > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > doesn't go in the cylinder when testing?
>
> Pull the fuse for your fuel pump.
>
> Don't forget to disconnect the coil signal. :)
>
> > 3. I hook the compression gauge into the spark plug hole. How many
times do
> > I turn the engine?
>
> Till the numbers stop climbing (4-5 compression strokes)
>
> http://www.georgiazclub.com/tips/ztech/comptest.htm
> is fairly good although I'm not so sure about step3
> (running the engine with plugs loose)
>
> --
> DougW
>
>
>
01-09-2004, 05:10 AM
#8
Guest
Posts: n/a
Re: Compression testing
It really helps if you can get air into the cylinder to compress when
you measure compression...
On Fri, 9 Jan 2004 07:40:08 UTC "William Oliveri" <wuji@bigvalley.net>
wrote:
> Thanks,
>
> I found in my FSM that the pressure for a 6 cylinder should be between 120
> and 140 psi.
>
> One thing I don't understand is why should the throttle be wide open
> position when fuel pump and coil are dis-engaged?
>
> What does the throttle have to do with anything when testing cylinder
> compression?
>
> Thanks,
>
> Bill
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:0OlLb.57344$PK3.46808@okepread01...
> > William Oliveri did pass the time by typing:
> > > Ok, I have a compression gauge but haven't used it yet.
> > >
> > > Can someone outline the steps and what the correct compression on a 258
> > > should be?
> >
> > Dunno
> >
> > > 1. Should I remove all spark plugs when testing compression?
> >
> > You could. I usually do a quick comression test when changing plugs.
> > Removing the plugs lets the engine crank easier.
> >
> > > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > > doesn't go in the cylinder when testing?
> >
> > Pull the fuse for your fuel pump.
> >
> > Don't forget to disconnect the coil signal. :)
> >
> > > 3. I hook the compression gauge into the spark plug hole. How many
> times do
> > > I turn the engine?
> >
> > Till the numbers stop climbing (4-5 compression strokes)
> >
> > http://www.georgiazclub.com/tips/ztech/comptest.htm
> > is fairly good although I'm not so sure about step3
> > (running the engine with plugs loose)
> >
> > --
> > DougW
> >
> >
> >
>
>
--
Will Honea <whonea@codenet.net>
you measure compression...
On Fri, 9 Jan 2004 07:40:08 UTC "William Oliveri" <wuji@bigvalley.net>
wrote:
> Thanks,
>
> I found in my FSM that the pressure for a 6 cylinder should be between 120
> and 140 psi.
>
> One thing I don't understand is why should the throttle be wide open
> position when fuel pump and coil are dis-engaged?
>
> What does the throttle have to do with anything when testing cylinder
> compression?
>
> Thanks,
>
> Bill
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:0OlLb.57344$PK3.46808@okepread01...
> > William Oliveri did pass the time by typing:
> > > Ok, I have a compression gauge but haven't used it yet.
> > >
> > > Can someone outline the steps and what the correct compression on a 258
> > > should be?
> >
> > Dunno
> >
> > > 1. Should I remove all spark plugs when testing compression?
> >
> > You could. I usually do a quick comression test when changing plugs.
> > Removing the plugs lets the engine crank easier.
> >
> > > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > > doesn't go in the cylinder when testing?
> >
> > Pull the fuse for your fuel pump.
> >
> > Don't forget to disconnect the coil signal. :)
> >
> > > 3. I hook the compression gauge into the spark plug hole. How many
> times do
> > > I turn the engine?
> >
> > Till the numbers stop climbing (4-5 compression strokes)
> >
> > http://www.georgiazclub.com/tips/ztech/comptest.htm
> > is fairly good although I'm not so sure about step3
> > (running the engine with plugs loose)
> >
> > --
> > DougW
> >
> >
> >
>
>
--
Will Honea <whonea@codenet.net>
01-09-2004, 05:10 AM
#9
Guest
Posts: n/a
Re: Compression testing
It really helps if you can get air into the cylinder to compress when
you measure compression...
On Fri, 9 Jan 2004 07:40:08 UTC "William Oliveri" <wuji@bigvalley.net>
wrote:
> Thanks,
>
> I found in my FSM that the pressure for a 6 cylinder should be between 120
> and 140 psi.
>
> One thing I don't understand is why should the throttle be wide open
> position when fuel pump and coil are dis-engaged?
>
> What does the throttle have to do with anything when testing cylinder
> compression?
>
> Thanks,
>
> Bill
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:0OlLb.57344$PK3.46808@okepread01...
> > William Oliveri did pass the time by typing:
> > > Ok, I have a compression gauge but haven't used it yet.
> > >
> > > Can someone outline the steps and what the correct compression on a 258
> > > should be?
> >
> > Dunno
> >
> > > 1. Should I remove all spark plugs when testing compression?
> >
> > You could. I usually do a quick comression test when changing plugs.
> > Removing the plugs lets the engine crank easier.
> >
> > > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > > doesn't go in the cylinder when testing?
> >
> > Pull the fuse for your fuel pump.
> >
> > Don't forget to disconnect the coil signal. :)
> >
> > > 3. I hook the compression gauge into the spark plug hole. How many
> times do
> > > I turn the engine?
> >
> > Till the numbers stop climbing (4-5 compression strokes)
> >
> > http://www.georgiazclub.com/tips/ztech/comptest.htm
> > is fairly good although I'm not so sure about step3
> > (running the engine with plugs loose)
> >
> > --
> > DougW
> >
> >
> >
>
>
--
Will Honea <whonea@codenet.net>
you measure compression...
On Fri, 9 Jan 2004 07:40:08 UTC "William Oliveri" <wuji@bigvalley.net>
wrote:
> Thanks,
>
> I found in my FSM that the pressure for a 6 cylinder should be between 120
> and 140 psi.
>
> One thing I don't understand is why should the throttle be wide open
> position when fuel pump and coil are dis-engaged?
>
> What does the throttle have to do with anything when testing cylinder
> compression?
>
> Thanks,
>
> Bill
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:0OlLb.57344$PK3.46808@okepread01...
> > William Oliveri did pass the time by typing:
> > > Ok, I have a compression gauge but haven't used it yet.
> > >
> > > Can someone outline the steps and what the correct compression on a 258
> > > should be?
> >
> > Dunno
> >
> > > 1. Should I remove all spark plugs when testing compression?
> >
> > You could. I usually do a quick comression test when changing plugs.
> > Removing the plugs lets the engine crank easier.
> >
> > > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > > doesn't go in the cylinder when testing?
> >
> > Pull the fuse for your fuel pump.
> >
> > Don't forget to disconnect the coil signal. :)
> >
> > > 3. I hook the compression gauge into the spark plug hole. How many
> times do
> > > I turn the engine?
> >
> > Till the numbers stop climbing (4-5 compression strokes)
> >
> > http://www.georgiazclub.com/tips/ztech/comptest.htm
> > is fairly good although I'm not so sure about step3
> > (running the engine with plugs loose)
> >
> > --
> > DougW
> >
> >
> >
>
>
--
Will Honea <whonea@codenet.net>
01-09-2004, 05:10 AM
#10
Guest
Posts: n/a
Re: Compression testing
It really helps if you can get air into the cylinder to compress when
you measure compression...
On Fri, 9 Jan 2004 07:40:08 UTC "William Oliveri" <wuji@bigvalley.net>
wrote:
> Thanks,
>
> I found in my FSM that the pressure for a 6 cylinder should be between 120
> and 140 psi.
>
> One thing I don't understand is why should the throttle be wide open
> position when fuel pump and coil are dis-engaged?
>
> What does the throttle have to do with anything when testing cylinder
> compression?
>
> Thanks,
>
> Bill
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:0OlLb.57344$PK3.46808@okepread01...
> > William Oliveri did pass the time by typing:
> > > Ok, I have a compression gauge but haven't used it yet.
> > >
> > > Can someone outline the steps and what the correct compression on a 258
> > > should be?
> >
> > Dunno
> >
> > > 1. Should I remove all spark plugs when testing compression?
> >
> > You could. I usually do a quick comression test when changing plugs.
> > Removing the plugs lets the engine crank easier.
> >
> > > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > > doesn't go in the cylinder when testing?
> >
> > Pull the fuse for your fuel pump.
> >
> > Don't forget to disconnect the coil signal. :)
> >
> > > 3. I hook the compression gauge into the spark plug hole. How many
> times do
> > > I turn the engine?
> >
> > Till the numbers stop climbing (4-5 compression strokes)
> >
> > http://www.georgiazclub.com/tips/ztech/comptest.htm
> > is fairly good although I'm not so sure about step3
> > (running the engine with plugs loose)
> >
> > --
> > DougW
> >
> >
> >
>
>
--
Will Honea <whonea@codenet.net>
you measure compression...
On Fri, 9 Jan 2004 07:40:08 UTC "William Oliveri" <wuji@bigvalley.net>
wrote:
> Thanks,
>
> I found in my FSM that the pressure for a 6 cylinder should be between 120
> and 140 psi.
>
> One thing I don't understand is why should the throttle be wide open
> position when fuel pump and coil are dis-engaged?
>
> What does the throttle have to do with anything when testing cylinder
> compression?
>
> Thanks,
>
> Bill
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:0OlLb.57344$PK3.46808@okepread01...
> > William Oliveri did pass the time by typing:
> > > Ok, I have a compression gauge but haven't used it yet.
> > >
> > > Can someone outline the steps and what the correct compression on a 258
> > > should be?
> >
> > Dunno
> >
> > > 1. Should I remove all spark plugs when testing compression?
> >
> > You could. I usually do a quick comression test when changing plugs.
> > Removing the plugs lets the engine crank easier.
> >
> > > 2. I have the Mopar MPI kit on my 258. Do I need to unhook it so fuel
> > > doesn't go in the cylinder when testing?
> >
> > Pull the fuse for your fuel pump.
> >
> > Don't forget to disconnect the coil signal. :)
> >
> > > 3. I hook the compression gauge into the spark plug hole. How many
> times do
> > > I turn the engine?
> >
> > Till the numbers stop climbing (4-5 compression strokes)
> >
> > http://www.georgiazclub.com/tips/ztech/comptest.htm
> > is fairly good although I'm not so sure about step3
> > (running the engine with plugs loose)
> >
> > --
> > DougW
> >
> >
> >
>
>
--
Will Honea <whonea@codenet.net>