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post #841 of 2220 Old 02-14-2011, 06:07 PM Thread Starter
SplitNail
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I put a can of restore in it to see what happens. I wonder if this issue could be in the heads..


1999 WJ 4.7L V8, 242 TC, Front Aussie Locker, 4 Inch RC X-Series lift, 17x8 w/ 4.5BS Black Rock Vipers, 285/70/R17 BFG KM2's, All AMSOIL Synthetic Fluids

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post #842 of 2220 Old 02-14-2011, 06:23 PM
sherker55
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did you do the compression test yourself? you should put those plugs in the order of the cylinders with bad compression and see if there is any correlation ( i don't know if it matters) only two looked f'd up though, such as discolored, scorched etc...

hopefully that restore **** will work out for you, good luck man

oh, and the platnium plugs are mandatory for the 4.7 HO, but not the 4.7...
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post #843 of 2220 Old 02-14-2011, 06:34 PM Thread Starter
SplitNail
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Quote:
Originally Posted by sherker55
did you do the compression test yourself? you should put those plugs in the order of the cylinders with bad compression and see if there is any correlation ( i don't know if it matters) only two looked f'd up though, such as discolored, scorched etc...

hopefully that restore **** will work out for you, good luck man

oh, and the platnium plugs are mandatory for the 4.7 HO, but not the 4.7...
I tossed the plugs. I also did the comp test myself with the help of my mechanic neighbor.

1999 WJ 4.7L V8, 242 TC, Front Aussie Locker, 4 Inch RC X-Series lift, 17x8 w/ 4.5BS Black Rock Vipers, 285/70/R17 BFG KM2's, All AMSOIL Synthetic Fluids

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post #844 of 2220 Old 02-15-2011, 10:06 AM Thread Starter
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So could this problem be in the heads? I don't have time/money to put a new motor in.

1999 WJ 4.7L V8, 242 TC, Front Aussie Locker, 4 Inch RC X-Series lift, 17x8 w/ 4.5BS Black Rock Vipers, 285/70/R17 BFG KM2's, All AMSOIL Synthetic Fluids

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post #845 of 2220 Old 02-15-2011, 10:24 AM
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you should put a table spoon of motor oil into the plug holes of the cylinders that are low and repeat the test. If the compression comes up to the level of the others then you have worn rings, if not then it is a head gasket or valves or a crack.

When you did the compression check did you have all the plugs out and the throttle wide open?

A leak down check would also help to diagnose. If the oil in the cylinder has no effect then pressurize the cylinder to 150 psi with the piton at TDC and see if it hold pressure. If it doesn't listen/look for where it is loosing it at. If you have air coming out the oil filler or dipstick then it is rings or a crack that goes into a oil passage, if you hear it out the exhaust it is a bad exhaust valve, out the air cleaner it is a bad intake valve, if you see bubbles or fluid is pushed out the radiator fill cap then it is a bad head gasket or a cracked head.

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post #846 of 2220 Old 02-15-2011, 10:30 AM Thread Starter
SplitNail
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Quote:
Originally Posted by tsconver
you should put a table spoon of motor oil into the plug holes of the cylinders that are low and repeat the test. If the compression comes up to the level of the others then you have worn rings, if not then it is a head gasket or valves or a crack.

When you did the compression check did you have all the plugs out and the throttle wide open?
Yes all plugs out, but I did not have the throttle wide open. I just turned it over as let it idle for a few seconds.

Quote:
Originally Posted by tsconver
A leak down check would also help to diagnose. If the oil in the cylinder has no effect then pressurize the cylinder to 150 psi with the piton at TDC and see if it hold pressure. If it doesn't listen/look for where it is loosing it at. If you have air coming out the oil filler or dipstick then it is rings or a crack that goes into a oil passage, if you hear it out the exhaust it is a bad exhaust valve, out the air cleaner it is a bad intake valve, if you see bubbles or fluid is pushed out the radiator fill cap then it is a bad head gasket or a cracked head.
Okay, I'll try that test Saturday as see if it is in the heads. I really hope it's a gasket/cracked head/ or valves.

1999 WJ 4.7L V8, 242 TC, Front Aussie Locker, 4 Inch RC X-Series lift, 17x8 w/ 4.5BS Black Rock Vipers, 285/70/R17 BFG KM2's, All AMSOIL Synthetic Fluids

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post #847 of 2220 Old 02-15-2011, 10:37 AM
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Quote:
Originally Posted by SplitNail View Post
Yes all plugs out, but I did not have the throttle wide open. I just turned it over as let it idle for a few seconds.



Okay, I'll try that test Saturday as see if it is in the heads. I really hope it's a gasket/cracked head/ or valves.
you normally want to open the throttle and then crank it until the gauge stabilizes. Repeat it three times and take the average. Try the oil in the cylinder trick too, to see if the rings are worn really bad.

Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

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My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

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post #848 of 2220 Old 02-15-2011, 10:48 AM Thread Starter
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Quote:
Originally Posted by tsconver

you normally want to open the throttle and then crank it until the gauge stabilizes. Repeat it three times and take the average. Try the oil in the cylinder trick too, to see if the rings are worn really bad.
Okay, I'm debating about wether I should just pay a mechanic to figure it out then I'll decide what to do. It would only be $75 to have them figure it out.

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post #849 of 2220 Old 02-15-2011, 10:07 PM
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Or one hour of your time. Pay yourself $75 an hour by doing the test yourself.

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post #850 of 2220 Old 02-15-2011, 10:18 PM Thread Starter
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Originally Posted by 85IrocZ-28
Or one hour of your time. Pay yourself $75 an hour by doing the test yourself.
Okay, sounds good. I just dont have time. And these things don't take an hour.

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post #851 of 2220 Old 02-17-2011, 07:56 AM Thread Starter
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So... If my problems are in the heads what is the most cost efficient way of fixing it? Remanned heads, new heads, machine the heads? Any ideas?

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post #852 of 2220 Old 02-17-2011, 08:02 AM
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Quote:
Originally Posted by SplitNail View Post
I have always heard use the champion copper cores...
i would stay away from those on a 4.7.

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post #853 of 2220 Old 02-17-2011, 08:05 AM Thread Starter
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Quote:
Originally Posted by TOW_HOOK

i would stay away from those on a 4.7.
That's odd. That's what it came with.

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post #854 of 2220 Old 02-17-2011, 08:09 AM
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Originally Posted by SplitNail View Post
I put a can of restore in it to see what happens. I wonder if this issue could be in the heads..
Do a leak down test, and listen to the valves, might need to remove the valve covers. the valves could need a valve job? have fun with that. it took me 3 months to do my wife's head gaskets... working full time and, have 3 others can be time consuming....

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post #855 of 2220 Old 02-17-2011, 08:09 AM
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Quote:
Originally Posted by TOW_HOOK View Post
i would stay away from those on a 4.7.


Quote:
Originally Posted by SplitNail View Post
That's odd. That's what it came with.
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