Cylinder compression test, what are the optimal numbers for is300?
#1
Driver School Candidate
Thread Starter
Cylinder compression test, what are the optimal numbers for is300?
I did the compression today, when i was changing the coil pack. Numbers I got:
Dry test
1 160 psi
2 160 psi
3 179 psi
4 180 psi
5 170 psi
6 160 psi
Wet test
1 193 psi
2 200 psi
3 200 psi
4 190 psi
5 190 psi
6 200 psi
I remember searching a while back, shouldn't dry test be 150 across all the cylinders? For wet test rule of thumb, I'm familiar with is 20-30% increase. Is that right?
Dry test
1 160 psi
2 160 psi
3 179 psi
4 180 psi
5 170 psi
6 160 psi
Wet test
1 193 psi
2 200 psi
3 200 psi
4 190 psi
5 190 psi
6 200 psi
I remember searching a while back, shouldn't dry test be 150 across all the cylinders? For wet test rule of thumb, I'm familiar with is 20-30% increase. Is that right?
#3
Maintenance Moderator
iTrader: (2)
define dry and wet test...
warm or cold?
fully warmed up compression test "dry" should be from 180-200 given the 10.5:1 compression ratio
add oil (if thats what you mean by "wet" test) and numbers should go up a ton, as yours did, but that is a false reading as the engine oil is sealing the rings much better than when dry... On my GTE pistons / headgasket GE motor, I get 160 across the board... it should be 8.8:1 give or take...
warm or cold?
fully warmed up compression test "dry" should be from 180-200 given the 10.5:1 compression ratio
add oil (if thats what you mean by "wet" test) and numbers should go up a ton, as yours did, but that is a false reading as the engine oil is sealing the rings much better than when dry... On my GTE pistons / headgasket GE motor, I get 160 across the board... it should be 8.8:1 give or take...
#4
Driver School Candidate
Thread Starter
Yeah engine was warm, when doing the test. Everything's stock, and has 150K miles. Seems like numbers are accurate. I'm convinced the head gasket must be going bad, since I'm blowing a white/grayish smoke, when reving high.
#6
Driver School Candidate
Thread Starter
Happened just now, rough idle, smell of unburned gas for about a minute. Grayinsh/white smoke. Reved the engine, got back to normal. Happens occasionally, Changed the plugs and wires, coil before. No change. Doesnt seem like a head gasket in that case.
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#8
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define dry and wet test...
warm or cold?
fully warmed up compression test "dry" should be from 180-200 given the 10.5:1 compression ratio
add oil (if thats what you mean by "wet" test) and numbers should go up a ton, as yours did, but that is a false reading as the engine oil is sealing the rings much better than when dry... On my GTE pistons / headgasket GE motor, I get 160 across the board... it should be 8.8:1 give or take...
warm or cold?
fully warmed up compression test "dry" should be from 180-200 given the 10.5:1 compression ratio
add oil (if thats what you mean by "wet" test) and numbers should go up a ton, as yours did, but that is a false reading as the engine oil is sealing the rings much better than when dry... On my GTE pistons / headgasket GE motor, I get 160 across the board... it should be 8.8:1 give or take...
#9
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Spec from the manual:
1,324 kPa (13.5 kgf/cm2, 192 psi) or more
Minimum pressure: 1,079 kPa (11.0 kgf/cm2, 156 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm2, 14 psi) or less
1,324 kPa (13.5 kgf/cm2, 192 psi) or more
Minimum pressure: 1,079 kPa (11.0 kgf/cm2, 156 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm2, 14 psi) or less
#10
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kumar
hi all, I'm new in this forum and needing an urgent help. I just baught an used 1mzfe for my es300 year 2002. its been almost 20 days and havent been able to start. at begining we thaught it was an electric problem but today we did compressio test and found out that a cylinder has 100 psi rest were between 100-145. Im in panama and unfortunately there are very few mechanics with experience of these engines. engine is still under warrenty, should I bay it or not????. what is the minimum according to service manual? the guy who sold me the engine, they buy them in US and they dont have any info about them. please help. my whatsapp is +50761302926. ill be so gratefull
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