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Holden viva 2005 wagon auto electrician said there is no compression in number 4 cylinder and not much in number 1 and maybe the valve could have been damaged? Advice appreciated please.

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  • Holden Master
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Have an accredited shop do a compression test, first dry then wet to determine why the compressions are not as should be
it will reveal such conditions as burnt valves , loose seat inserts , head gaskets, cracks and worn rings
If the auto electrician made the statement with out testing then it is a guess and you nee to get a proper diagnosis of the condition of the engine

Posted on Apr 20, 2015

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  • Master
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The valves allow air and gasoline to enter the combustion chamber, to be ignited by the spark plug, and to allow the burned gases to be exhausted from the chamber.

When the valves do not work, a mechanic needs to remove parts of the engine, to see what's wrong, and to make repairs.
It could cost you $500 to $1000 US dollars.

Maybe, time to "junk" the TEN-YEAR-OLD vehicle, and buy another one ???

Posted on Apr 20, 2015

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  • Holden Master
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A cylinder efficiency test would pinpoint the problem so you could get a rough idea of the cost before having the repair shop perform the necessary surgery.

This test is more effective than a compression test and injects compressed air into each cylinder so the amount of escaping air and the path it takes will indicate the fault fairly accurately.

Burned valves and seats are very unusual these days and when they happen it is usually because of poor maintenance.

Posted on Apr 20, 2015

  • Kirsty Dawson
    Kirsty Dawson Apr 20, 2015

    How does one do a cylinder compression test? Thanks too for the info

  • Vernon Taylor Apr 20, 2015

    Both tests use an adaptor into the spark plug hole - a compression test connects an air pressure gauge to the adapter so when the engine is cranked using the starter motor a pressure will be registered, or not as the case might be. The compression test is simple to perform and needs little skill or special equipment to perform but is limited in its use. The cylinder efficiency test requires the engine to be positioned for each cylinder before performing the test and then locking in that position. This is much easier and quicker with manual transmission.

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  • Holden Master
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According to the How Stuff Works site, these might be the cause for no compression:

"Lack of compression - If the charge of air and fuel cannot be compressed properly, the combustion process will not work like it should. Lack of compression might occur for these reasons:
  • Your piston rings are worn (allowing air/fuel to leak past the piston during compression).
  • The intake or exhaust valves are not sealing properly, again allowing a leak during compression.
  • There is a hole in the cylinder.
The most common "hole" in a cylinder occurs where the top of the cylinder (holding the valves and spark plug and also known as the cylinder head) attaches to the cylinder itself. Generally, the cylinder and the cylinder head bolt together with a thin gasket pressed between them to ensure a good seal. If the gasket breaks down, small holes develop between the cylinder and the cylinder head, and these holes cause leaks."
Other possible problems causing low compression:
IF it is low possible causes:

Leaking head gasket

Worn cylinder bore

Broken piston rings

worn valve

Dirty valve seat

Carbon build up on the valve stem preventing it closing.

Hole in the piston - sounds unusual but i have seen it.

Cracked cylinder bore.
-----------------------
Assuming you want to know what do do about it, well, if the rings are worn, your engine may need a ring job and that is not cheap. Unless it is some problem with your timing belt, most solutions involve taking the head off your engine to inspect it and figure out what the problem is.

Posted on Apr 20, 2015

  • Kirsty Dawson
    Kirsty Dawson Apr 20, 2015

    I'm guessing taking the head off will be a costly job. Lots of options thank you..

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