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