remove upper or bottom plugs for compression check

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Mar 12, 2005 | 11:47 AM

RoTa7

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From: San Francisco

remove upper or bottom plugs for compression check

haynes says upper
http://www.rotaryresurrection.com/ says bottom

Mar 12, 2005 | 11:54 AM

Dan H

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From: San Francisco, CA

Its bottom. The top trailing plugs holes are very tiny and won't give much of a reading.

Mar 12, 2005 | 12:55 PM

HAILERS

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From: FORT WORTH, TEXAS,USA

FSM says.......upper or Trail plugs.

Mar 12, 2005 | 08:48 PM

RETed

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From: n

Both upper...
If you use the leadings, the compression is *slightly* lower.

-Ted

Mar 12, 2005 | 10:40 PM

NZConvertible

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From: Auckland, New Zealand

It really doesn't matter which holes give you higher or lower readings. If you're comparing your readings to Mazda's specs then you need to use Mazda's method. So you should use the upper (trailing) plug holes.

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