2007-09-27 13:38:20 · 8 answers · asked by fireater0303 1 in Cars & Transportation ➔ Maintenance & Repairs
the toyota has a 3.0 and the bad cyl. is rated at 50 psi..??
2007-09-27 13:40:43 · update #1
Most common causes:
Bad/burnt valve. Typically exhaust valve.
Bad head gasket.
Bad Rings.
Do a compression test on that cylinder and get a reading.
Squirt some oil in through the spark plug hole and repeat compression test.
If the oil causes you to get a higher compression reading , it's worn rings. Otherwise, it's either burnt valves or head gasket.
How to fix? Once you diagnose what is wrong, replace the appropriate part.
2007-09-27 13:47:20 · answer #1 · answered by hsueh010 7 · 0⤊ 0⤋
first put about 2 tablespoons of oil, trans fluid, motor oil, wd-40, doesn't matter, and redo the compression test. if the reading goes up past 100 psi, the rings are worn or being held in place by carbon(burnt oil), if this is the case (carbon on the rings) buy some gum cutter or intake cleaner and fill up the entire cylinder through the spark plug hole and let it set overnight. next morning crank the engine without the spark plug in it to blow out whats left in that cylinder, change your oil to drain cleaner from the crankcase, install new spark plug and start engine. let it warm up a little but not get hot. recheck compression. now, if adding oil to the cylinder did not get the compression up you have leakage somewhere else. to find where you will have to perform a leak-down test. you will need a special tool for this. anyhow this tool pressurizes the cylinder and wherever the air leaks out that's what you need to fix. example: if air leaks out of the intake/throttle plate you have either a bad intake valve, valve seat, sticking valve, or broken valve spring. if it leaks out of the exhaust pipe, same problems but with exhaust valve. if it leaks out of the oil filler hole- bad rings, out of the radiator-cracked block,blown head gasket, cracked head. if the leak down test shows a negligible amount of leak down, its a wiped camshaft.hope this gives a good starting point. p.s. this is a somewhat big job to fix and i'd recommend paying someone else to fix it.
2007-09-27 21:12:15 · answer #2 · answered by WMC Jr 3 · 1⤊ 0⤋
Your valve cover gasket could be the problem. That's the easy fix. Also your cam shaft could be wearing down, causing valves to open or close to slow. releasing pressure prematurely. This could also be the case if the valves do not seat properly. Due to pitting on the valve or a bent valve stem...
2007-09-27 20:47:51 · answer #3 · answered by rixparx 4 · 0⤊ 0⤋
not enough info,, such as miles on the engine.
could just be bad valve on that one cylinder, or a broken compression ring. have to remove the head and check the valves. if thats ok, then you need a lower end rebuild.
2007-09-27 20:46:03 · answer #4 · answered by Anonymous · 0⤊ 0⤋
If you have a compression problem its either your piston rings are worn down looseing thier seal. Or the valva seats are leaking in the head. One option is to switch to a heavier oil and try a additive like lucas it may help. If not tear down your engine. Good luck.
2007-09-27 20:56:33 · answer #5 · answered by Anonymous · 0⤊ 0⤋
COULD BE BURNT VALVE,OR WORN RINGS. SQUIRT OIL IN CYLINDER THEN CHECK COMPRESSION IF IT GOES UP A BUNCH PROBABLY WORN RINGS TOYOTA DO NOT REBUILD VERY GOOD ? YOU MIGHT FIND A LOW MILEAGE USED ENGINE WITH LOW MILES, IF YOU HAVE MORE THAN ONE CYLINDER WITH LOW COMPRESSION MAYBE TIMING BELT IS OFF A TOOTH ?
2007-09-27 20:52:50 · answer #6 · answered by the1autoguru 3 · 0⤊ 0⤋
You either have a bad head gasket or a burnt valve..... you need to remove the head and check for both.
2007-09-27 20:52:41 · answer #7 · answered by Stampy Skunk 6 · 0⤊ 0⤋
could need a valve job or the engine rebuilt.
2007-09-27 20:44:15 · answer #8 · answered by mister ss 7 · 0⤊ 0⤋