Question about 2005 Hyundai Elantra
All four cylinders should have over 100 #'s of pressure-ideally over 150#'s-and they should be even or close to even.
You could take off the timing belt cover and check the timing, but it sounds like 2 bad cylinders-which could be a valve train problem.
Posted on Feb 13, 2014
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Posted on Jan 02, 2017
The fault may very well be with the tester itself: The compression tester should have a check or "HOLD" valve which causes the needle on the gauge to REMAIN at it's highest recorded point. For example, my 1993 Isuzu Rodeo had a compression of 160 psi. The gauge "holds" the needle at the measurement UNTIL THE VALVE IS RELEASED-(mine had a button that needed to be pressed to release the pressure) then there will be a slight discharge of the pressure contained within, the needle should drop back to zero, and THEN you should be able to remove the tester. What I am getting at is if the pressure drops that fast, I think the "HOLD" valve on it may be defective, OR the tester is not properly sealing on the combustion chamber (stripped threads?). Might be worth buying another one for 20$ just to be sure.
A four cylinder engine, you say? Very rarely will you have ALL of your cylinders exhibit the same pressure loss symptoms. How did the other three cylinders test?
Here are the components required for a running engine to fire:
1-good spark (adequate voltage, good plugs/wires)
2-dedicated fuel supply (fuel pump with adequate pressure)
3-timing (slack in timing chain/belt?)
If the timing belt broke or maybe even jumped a tooth or two, it COULD cause DAMAGE to your engine-pistons hitting valves-if it IS what they call an "INTERFERENCE" engine.
Hope this helps.
Posted on Dec 31, 2009
Testimonial: "Very helpful insight."
With regrets, Not likely, pull the vlave cover and observe the height of the valves, if it is bent it should be not quite as tall as the rest.
Posted on Aug 06, 2009
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.
Posted on Oct 04, 2009
SOURCE: 2002 Hyundai Elantra 2.0, #1
If it is only that circuit and not the parts itself, it is likely that either someone has damaged the wires going to the ECM to drive the injectors or the ECM has failed on those 2 drivers. My suspicion is that this happened shortly after the install. Find where the wires are for the device itself and see if they are in close proximatey to any wiring harnesses or has been cut. This is where you will likely find the culprit.
Posted on May 06, 2011
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