# (Update: Help???) Compression test

**URL:** <https://forums.speedlife.net/t/update-help-compression-test/80662>\
**Category:** SON240sx Automotive\
**Created:** [March 5, 2004, 1:54pm UTC](https://forums.speedlife.net/t/update-help-compression-test/80662 "2004-03-05T13:54:04Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![blackep3](https://avatars.discourse-cdn.com/v4/letter/b/71c47a/32.png) [@blackep3](https://forums.speedlife.net/u/blackep3)\
**Post date:** [March 5, 2004, 1:54pm UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/1 "2004-03-05T13:54:04Z")

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Hi,

How do I do a compression test on my engine? What about on an engine sitting out of the car? I heard that I can crank it with a battery hooked up to the starter… but how??

Please help! Thanks!

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**Author:** ![MRWmotorsports](https://avatars.discourse-cdn.com/v4/letter/m/f14d63/32.png) [@MRWmotorsports](https://forums.speedlife.net/u/MRWmotorsports)\
**Post date:** [March 5, 2004, 2:04pm UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/2 "2004-03-05T14:04:09Z")

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Search… I explaind this just a few weeks ago in this forum.

-Martin.

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**Author:** ![oshiet](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@oshiet](https://forums.speedlife.net/u/oshiet)\
**Post date:** [March 5, 2004, 2:11pm UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/3 "2004-03-05T14:11:37Z")

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Send a 12V signal to the starter trigger connection.

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**Author:** ![Black240Matt](https://avatars.discourse-cdn.com/v4/letter/b/4bbf92/32.png) [@Black240Matt](https://forums.speedlife.net/u/Black240Matt)\
**Post date:** [March 5, 2004, 3:21pm UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/4 "2004-03-05T15:21:07Z")

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take the spark plugs out, take the fuel pump fuse out, use a compression testor, um, dunno what else, been a while

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**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\
**Post date:** [March 5, 2004, 6:39pm UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/5 "2004-03-05T18:39:26Z")

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To get an accurate compression reading the engine has to be at optimal running temp.

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**Author:** ![blackep3](https://avatars.discourse-cdn.com/v4/letter/b/71c47a/32.png) [@blackep3](https://forums.speedlife.net/u/blackep3)\
**Post date:** [March 6, 2004, 9:55am UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/6 "2004-03-06T09:55:46Z")

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I didn’t realize the freakin’ gauge costs so much…

Is there someone near-by Standard Auto Wreckers with a compression guage? I could really use some help! Thank you!

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**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\
**Post date:** [March 6, 2004, 9:58am UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/7 "2004-03-06T09:58:12Z")

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Dude there $21.99 at CT thats not expensive.

I spent $69.99 on mine dude.

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**Author:** ![blackep3](https://avatars.discourse-cdn.com/v4/letter/b/71c47a/32.png) [@blackep3](https://forums.speedlife.net/u/blackep3)\
**Post date:** [March 6, 2004, 10:48am UTC](https://forums.speedlife.net/t/update-help-compression-test/80662/8 "2004-03-06T10:48:43Z")

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WHAT??? 21.99 at CT?? I’m going today…

Went yesterday and some dude told me $90 to start, average around 140… that’s when I said forget it… but i gotta go and check it out! Thanks!