Had compression test done - numbers...
Sep 11, 2006, 04:46 PM
#17
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Originally Posted by Jeff_Jeske
There are several threads on this topic. Many EVO's have one cyl that reads low yet still make very good power. The boost tapering thing is normal. The gauge you use to read boost may not be accurate.
I've also contacted a few well known shops in my area and they all agree that it's not really nothing to worry about. One shop even said that as long as they are within 20% of each other then I should be fine.
The boost tapering was discovered by using a MAP sensor so it wasn't only noticed by using my boost gauge.
My next step is going to be installing a Forge WGA to see if this helps the taper. It just may very well be because of my changed VE that the stock turbo can't keep up with the engine.
Apr 14, 2007, 02:02 AM
#18
Sorry to bring this back up, but I too did a compression check and had similar results to Kapolani.
cyl 1---185
cyl 2---180
cyl 3---165
cyl 4---185
The reason I did a check is becuase I have a coolant leak that I cannot find. I pressurized the coolant system and their is no leak. But when I drive the car and rev it to redline, then the coolant leaks. I put screw clamps on all the hoses that enter into the thermostat housing and the water assembly pipe, but there is still a leak. The coolant residue is located below the thermostat housing and on top of the temperature sensor.
I am wondering if the coolant leak is related to the low compression on number 3?
cyl 1---185
cyl 2---180
cyl 3---165
cyl 4---185
The reason I did a check is becuase I have a coolant leak that I cannot find. I pressurized the coolant system and their is no leak. But when I drive the car and rev it to redline, then the coolant leaks. I put screw clamps on all the hoses that enter into the thermostat housing and the water assembly pipe, but there is still a leak. The coolant residue is located below the thermostat housing and on top of the temperature sensor.
I am wondering if the coolant leak is related to the low compression on number 3?
Apr 14, 2007, 09:00 AM
#21
Sorry to bring this back up, but I too did a compression check and had similar results to Kapolani.
cyl 1---185
cyl 2---180
cyl 3---165
cyl 4---185
The reason I did a check is becuase I have a coolant leak that I cannot find. I pressurized the coolant system and their is no leak. But when I drive the car and rev it to redline, then the coolant leaks. I put screw clamps on all the hoses that enter into the thermostat housing and the water assembly pipe, but there is still a leak. The coolant residue is located below the thermostat housing and on top of the temperature sensor.
I am wondering if the coolant leak is related to the low compression on number 3?
cyl 1---185
cyl 2---180
cyl 3---165
cyl 4---185
The reason I did a check is becuase I have a coolant leak that I cannot find. I pressurized the coolant system and their is no leak. But when I drive the car and rev it to redline, then the coolant leaks. I put screw clamps on all the hoses that enter into the thermostat housing and the water assembly pipe, but there is still a leak. The coolant residue is located below the thermostat housing and on top of the temperature sensor.
I am wondering if the coolant leak is related to the low compression on number 3?
Apr 14, 2007, 09:43 AM
#22
05's have a recall on the hoses from the turbo leaking. Mine had this problem as well. When I would drive the car hard I would smell coolant and the thermo housing always had tell-tell signs of leakage. I replaced the hoses and the problem was solved. You should try this before anything.
Apr 14, 2007, 02:17 PM
#25
Finding out the trouble is due to a defective hose would be welcomed news. Even if the VIN check revealed nothing, I'd still consider replacing it. I don't see how that would explain the slightly different pressure in #3, but if it fixes the coolant leak, it's worth something.
Apr 17, 2007, 10:32 PM
#27
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When I did a compression test mine was 145 all the way across the board.. Seemed fine, and I have/had the coolant problem from the leaking hose's too, just got some good clamps, and wala, it was fixed.
Apr 18, 2007, 04:11 AM
#28
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05's have a recall on the hoses from the turbo leaking. Mine had this problem as well. When I would drive the car hard I would smell coolant and the thermo housing always had tell-tell signs of leakage. I replaced the hoses and the problem was solved. You should try this before anything.
Apr 18, 2007, 04:19 AM
#29
05's have a recall on the hoses from the turbo leaking. Mine had this problem as well. When I would drive the car hard I would smell coolant and the thermo housing always had tell-tell signs of leakage. I replaced the hoses and the problem was solved. You should try this before anything.
Apr 18, 2007, 05:53 AM
#30
Low cylinder pressure in one whole is common. Guy I was adressing was not original poster. He was complaining of losing coolant when pushing the car hard and stated were leak appeared to be. I've experienced this as well as others in this thread and it stems from bad turbo coolant hoses. Your right it has nothing to do with low cylinder pressure