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The mkiv Supra Owners Club

compression test


supraman382
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Just wondering how an engine compression test is done nowadays. Was speaking to my dad the other day and when he used to work on cars (30 years or so ago) it was a case of removing the spark plug one at a time and placing a guage over the cavity and taking a reading (then again with the remaining plugs)

 

Still the case or is it like everything else, just plug in a scart! :)

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Yep, DIY. Guage £15.... easy job (just watch out for the coil pack connectors if they're a bit old).

 

Also you may want a leak down test done while you're in there. This gives a better indication of the condition of the rings as it uses compressed air to check the sealing of the rings against the bore. This is something for a garage to do though.

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Is the cheapy gauge from Halfords good enough?

 

Any guage is ok as its not the actual numbers (accuracy) thats important, but what each cylinder is compared to the others. As long as it works and has a scale that can read 5 or 10psi increments then its going to be fine.

 

Draper do one for £18 and Screwfix for £16.50

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