Most petrol engine run 145psi ( low compression engines) to around 165 psi (high compression engines) regardless of the compression read there should not be any more that 10% difference between adjacent cylinders Hugh differences in cylinders indicates valve problems
SOURCE: what should the valve timing be on a 1990 daihatsu charade 1990 3 cylinder
Ignition timing should be checked and adjusted whenever spark plugs are replaced or any distributor maintenance is performed. Ignition timing at 1000 RPM or less should be as follows: on 1989 1.3L/4-79 engines, 3-7°BTDC; on 1990-92 1.3L/4-79 engines, 0-2°; on 1.6L/4-97 engines, 1-5°.
SOURCE: what is the cylinder compression psi fpr the 2.0 liter engine
usual on 4 cylinder around 175psi.225psi is very high for your car,150psi seems ok,you may have two problems.A leaking head gasket and high compression due to carbon build up on the pistons.Check your Hyundai Dealer to see is this problem is covered under their 100,000 mile warranty,it should be.IF not then
the head needs to come off and had gasket replaced along with clean the top of pistons since they are right there,sounds like and easy fix.also check condition of radiator,and I would rec. replacing thermostat since some Hyundai models had problems with their thermostats
SOURCE: one cylinder has zero compression. took head off
OK!... did you do a cylinder 'leak down test'?.. .if not, do it! If any 'unacceptable' leakage, have the head REDONE! NOW!.. you must BE SURE the valve timing is accurate!... Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
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