engine compression low???
engine compression low???
Member
Joined: Dec 2007
Posts: 40
Likes: 0
From: idleyld Park , oregon
That figure is low .
You need to do things to make the right test .
Start engine , run till operating temp .(heat coming out the heater , and defrost )
Remove all 6 plugs .
Then start on either side of the engine , and block the throttle all the way open .
You Need To see the needle of the gauge leap 4 to 5 times for each cylinder .
As I said record this reading on a piece of masking tape attached to your hood .
Now note which of the figures are low .
then determine who low they are compared to the highest ones .
should be no more than 10-15% difference.
Next add 1 teaspoon of oil to the cylinder that is low , If you have more than one tht is low , do them one at a time . now record your readings
THis is where it get's hard .
The cylinders that were low , and you added oil to , should have come up in reading , IF THE compression ring ,is bad , the oil helps to seal .
If nothing happens , it may be a valve not sealing in the seat .
You can also use a vaccum gauge to " READ the engine" http://sbftech.com/index.php/topic,3020.0.html
I
You need to do things to make the right test .
Start engine , run till operating temp .(heat coming out the heater , and defrost )
Remove all 6 plugs .
Then start on either side of the engine , and block the throttle all the way open .
You Need To see the needle of the gauge leap 4 to 5 times for each cylinder .
As I said record this reading on a piece of masking tape attached to your hood .
Now note which of the figures are low .
then determine who low they are compared to the highest ones .
should be no more than 10-15% difference.
Next add 1 teaspoon of oil to the cylinder that is low , If you have more than one tht is low , do them one at a time . now record your readings
THis is where it get's hard .
The cylinders that were low , and you added oil to , should have come up in reading , IF THE compression ring ,is bad , the oil helps to seal .
If nothing happens , it may be a valve not sealing in the seat .
You can also use a vaccum gauge to " READ the engine" http://sbftech.com/index.php/topic,3020.0.html
I
Member
Joined: Dec 2007
Posts: 293
Likes: 2
From: Taylorsville Ky
When they get to about 50-60 psi it probably won't start and it don't have to be all of them either.
It depends on the comp ratio of your engine as to what the engine will pump when new or rebuilt.
When I sold my '93 3.0L last summer it had 220,000 miles on it and it still runs fine. I can't remember what the last comp check was. A friend owns it now.
It depends on the comp ratio of your engine as to what the engine will pump when new or rebuilt.
When I sold my '93 3.0L last summer it had 220,000 miles on it and it still runs fine. I can't remember what the last comp check was. A friend owns it now.
Member
Joined: Jun 2004
Posts: 13
Likes: 3
From: Parma Ohio
eh I got about 115k out of my 98's 3.0 before it locked itself up and I always properly maintained it and never ragged on it.
the cam syncronizer gear ate itself up starved the engine of oil and locked itself up.
common prob on the 3.0's might want to replace it if its a higher milage 3.0
the cam syncronizer gear ate itself up starved the engine of oil and locked itself up.
common prob on the 3.0's might want to replace it if its a higher milage 3.0
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