Engine Compression Test

Mobile engine compression test at your home or office, to establish the real internal condition before spending on repairs.

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Service Info

Typical Duration 1.5 hours

We bring the engine to operating temperature, disable fuel and ignition, remove all spark or glow plugs, measure cranking compression on each cylinder, carry out a wet test and a leak down test where indicated, then interpret the results.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Mobile Engine Compression Test

A compression test measures how well each cylinder seals, which is the most direct indication of an engine internal health available without dismantling it. It identifies worn rings, burnt valves, a failed head gasket between cylinders, and damage from a timing failure. It is also the test that should come before any large repair decision. Michanic carries out compression testing at your home or office.

Why Choose Our Mobile Engine Compression Test Services?

  1. Evidence Before Spending:
    Before an expensive repair or buying a used car, this is the test that establishes whether the engine is genuinely sound.
  2. Misfires Explained:
    A misfire that persists after plugs, coils and injectors points at compression, and this is the test that proves it.
  3. Rings Versus Valves:
    A wet test, adding a little oil to the cylinder, distinguishes worn rings from a valve sealing problem, and those differ hugely in repair scope.
  4. At Your Home or Office:
    No workshop booking to find out whether an engine is worth repairing.

Why We are the Best Choice for Mobile Engine Compression Test

  • Correct Procedure:
    Engine at operating temperature, throttle open, all plugs removed and fuel and ignition disabled. Skipping any of those gives misleading figures.
  • Relative Values Compared:
    Variation between cylinders matters more than absolute numbers. A consistent set is good news even at modest readings.
  • Leak Down Where Needed:
    Where compression is low, a leak down test identifies exactly where the pressure is escaping, which compression alone cannot.
  • Honest Interpretation:
    You are told what the figures mean for your engine and your decision, without dressing them up in either direction.

Compression testing matters most at decision points. Before committing to a head gasket, a turbo or an expensive diagnostic chase, it establishes whether the engine underneath is worth the money. Before buying a used car, it reveals wear that no test drive shows. The pattern is as informative as the numbers: two adjacent cylinders both low usually indicates a head gasket failed between them, one cylinder low points at a valve or a ring problem, and all cylinders evenly low suggests general wear or a timing issue.

Frequently Asked Questions

  • What does a compression test tell you?
    How well each cylinder seals, which reflects the condition of the piston rings, valves and head gasket. It is the most direct measure of internal engine health available without taking the engine apart.
  • What is the difference between a wet and dry test?
    A dry test measures compression as found. A wet test repeats it with a little oil added to the cylinder. If the reading improves substantially, the rings are worn; if it does not, the valves or gasket are at fault.
  • Do the numbers or the differences matter more?
    The differences. A set of cylinders within a modest range of each other indicates an even, healthy engine. One cylinder well below the others is significant even if the absolute figures look acceptable.
  • What is a leak down test?
    It pressurises each cylinder with the piston at the top of its stroke and measures where the air escapes. Hearing it at the intake, the exhaust or the oil filler identifies the failure precisely.
  • Should I do this before buying a used car?
    It is one of the most informative checks available. A test drive reveals nothing about ring or valve wear, and compression figures tell you whether the engine has the life the seller implies.