Compression test - OK to do without exhaust or throttle body?
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Racer
Joined: Jan 2000
Posts: 422
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From: Palatine IL
Compression test - OK to do without exhaust or throttle body?
Hydrolocked the 2000 but got it running again. Throwing a P1515 so I ordered up a throttle body. While I'm waiting for it I'd like to do a compression test and install headers. Is it OK to do a compression test without the throttle body and exhaust? I assume I'm just looking for readings within 10% on all cylinders.
Tech Contributor
Joined: Jan 2007
Posts: 19,493
Likes: 1,178
From: Dyer, IN
Hydrolocked the 2000 but got it running again. Throwing a P1515 so I ordered up a throttle body. While I'm waiting for it I'd like to do a compression test and install headers. Is it OK to do a compression test without the throttle body and exhaust? I assume I'm just looking for readings within 10% on all cylinders.
Instructor
Joined: Apr 2004
Posts: 133
Likes: 7
From: Wenatchee WA
You could always try doing a leakdown test instead of compression, no need to run the motor
I meant no need to spin the engine over with the starter. LOL
I meant no need to spin the engine over with the starter. LOL
Last edited by PDQC5; Sep 22, 2011 at 02:24 PM.
Tech Contributor
Joined: Jan 2007
Posts: 19,493
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From: Dyer, IN
Tech Contributor
Joined: May 2008
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Back in the days of carburetors, they even recommended holding the carb throttle plates open, when doing a compression test, to allow sufficient air to enter the cylinders.
