My Compression #

#1 150

#2 155


#3 155


#4 155



What the heck is going on. I did the compression test by the book, and these #s seem very low

 

Try another gauge. Those numbers seem pretty consistent.

 

I thought the numbers were a little low. I like how consistant they were. I have used the gauge before and the numbers were diffrent. Do you guys think this is ok

 

If you had a IX. You should be higher. Normally only 1 or 2 would be low. I say faulty gauge. A new one is like $10. Double check it before you jump to any conclusions.

 

consitency is the key. Normally, if you have an issue a cylinder or possibly two might be low, but to have all 4 low, that's not normal. Probably the gauge. You did remember to do this at WOT, right? If not, the numbers will be low.

 

Did you have the throttle plate open?


-Em

 

Your fine

Was eng warm, TB open, and let it turn over enough?

 

Throttle was open. the engine was sitting for 30 min before I did the test. I cranked all the way, tell the gauge stoped moving

 

I would be more concerned if one of the numbers was way out of wack. Since they're all uniform, I'm sure it's good. I doubt every single cylinder has a leaking valve, or a worn ring.

 

That is not too low - range is 163-138 with no more than 14 psi difference.

Per the manual:

Before inspection, check that the engine oil, starter and
battery are normal. Also, set the vehicle to the following
conditions:
• Engine coolant temperature: 80 − 95°C (176 − 203°F)
• Lights, and all accessories: OFF
• Transaxle: Neutral
2. Disconnect the spark plug cables.
3. Remove all of the spark plugs.
4. Disconnect the crankshaft position sensor connector.
NOTE: Doing this will prevent the engine control module
from carrying out ignition and fuel injection.
WARNING
Keep your distance from the spark plug hole when
cranking. Oil, fuel, etc., may spray out from the spark
plug hole and may cause serious injury.
5. Cover the spark plug holes with a shop towel etc. Crank the
engine for a few seconds to clear debris from a round the
spark plug holes. After the engine has been cranked, check
for foreign material adhering to the shop towel.
Install the compression gauge to one of the spark plug
holes.
7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min): 1,128
kPa (163 psi)
Minimum limit (at engine speed of 250 r/min): 951 kPa
(138 psi)
8. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: 98 kPa (14 psi)
9. If there is a cylinder with compression difference or a
compression difference that is outside the limit, pour a small
amount of engine oil through the spark plug hole, and repeat
the operations in steps 6 to 8.
(1) If the compression increases after oil is added, the cause
of the malfunction is a worn or damaged piston ring
and/or cylinder inner surface.
(2) If the compression does not rise after oil is added, the
cause is a burnt or defective valve seat, or pressure is
leaking from the gasket.
10.Connect the crankshaft position sensor connector.
11.Install the spark plugs and spark plug cables