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Cylinder compression @ 400RPM:
Standard 199psi
Minimum 170psi
Max. Allowable Variance Between Each Cylinder: 14.2psi
If any cylinder is below the Minimum, check the Valves first, then check the rings & head gasket.
No cylinder should be below/above 14.2psi of the next cylinder tested. If cylinder 1=199psi, and cylinder 2=170psi, the varaince is over 14.2psi. Check intake valve for effected cylinder.
However, if Cylinder One is 190psi, Two is 170psi, Three is 182psi, and four is 184psi, then Cylinder one is above the variance. Although Cylinder one is almost at the ceiling and in the best repair, the rest are within specification, even though number two is at the floor. Check the intake & exhaust valves for the effected cylinders, and adjust where necessary. If the intake valve or exhaust valve is not seating properly (closed) during the compression stroke, then air is releaced, reducing compression.
If one or more cylinders are below the floor, and it is determined the
valves are adjusted within specification, as well as the head gasket being
in sound condition, then you need to rebuld or replace the engine.
The compression rings are no longer within specifications.
Do not fool with oil pressure, and say "ehh, it's ok." That can
lead to your engine wearing prematurely. Proper oil pressure
is needed to reduce all metal wear within the engine.
If the cap is opening prematurley, you will loose coolant into the over-flow tank at an accelerated rate. If it continues, you can loose coolant, because the tank can't hold the coolant.
If the cap does not relase, or releases at a greater rate, you risk
blowing hoses, and/or the head gasket.
MPFI Fuel Pressure:
At idle: 29-37psi
Fuel pressure is necessary for proper fuel/air mixtures. If the fuel pressure is lacking, you can so little ot no difference, depending on how low is actually is. Low fuel pressure can cause rough idle, lack of pickup, and low to no up-hill acceleration.
Higher fuel pressure will change the fuel mixture, but also effect leakage
rate (which is 1 drop per minute or less when the engine is off). Higher
presure also puts you at risk of bursting the fuel lines, which can cause
fire, or other hazard.
Tire pressures can cause a multitude of tire wear problems. If
too under inflated, you get shoulder wear (sides of the tire).
If overinflated, you get centerwear (down the middle of the tire).
Although improper allignment causes shoulder wear (on one side) of the
tire, underinflating will wear both sides. This is how you tell the
difference between the two. Or, if underinflated, and out of alignment,
one side will wear heavier than the other.
32-34-psi is the standard inflation rates of most tires, for 1-ton or
heavier vehicles. I have found, that with the low weight of the Tracker,
a lower pressure can be set to help soften the ride a bit, without compromising
integreity of the tires..