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Relative compression

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6 years 6 months ago - 6 years 6 months ago #14202 by naros812000
Dears,
I have done a relative compression test on my toyota avalon 2012 v6 3.5 engine. Here I have uploaded the picture and I want to know your opinion of this test


Thank you
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Last edit: 6 years 6 months ago by naros812000.

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6 years 6 months ago - 6 years 6 months ago #14208 by Dylan
Replied by Dylan on topic Relative compression
Aloha ;) I prefer to do a relative compression test with an amp clamp.
Moving this topic to diagnostic tools & techniques.
Last edit: 6 years 6 months ago by Dylan.

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6 years 6 months ago #14209 by Ro-longo
Replied by Ro-longo on topic Relative compression
Very difficult to make anything out with the picture provided. Can you try to upload a better image, thanks.

"Silver bullets are for killing Werewolves, not fixing Cars." -Rob Longoria-

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6 years 6 months ago #14210 by Dylan
Replied by Dylan on topic Relative compression
Check this one out from Motor Age if you want to perform a relative compression test without an amp clamp. Also notice the AC coupling.

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6 years 6 months ago #14212 by karim
Replied by karim on topic Relative compression
Thank you all.

I used Low Amp 20 .... relative compression test on Toyota avalon 2012 V6 3.5L. Photo updated.
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6 years 6 months ago #14218 by Tyler
Replied by Tyler on topic Relative compression
Can you show us the same capture, but zoomed out? 500mS or 1 second on the screen would be great.

It seems like the amp probe is struggling to measure current consistently... If you were to use the same probe on a steady draw (headlight, blower motor), does it behave the same way?

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6 years 6 months ago #14223 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Relative compression
With a 3.5 V6 the starter will take a huge current out of range of your clamp, as already suggest do a voltage relative compression instead .
When working single handed I do voltage relative compression test by just plugging into the cigar lighter socket. I first do an DC test to check the cranking voltage to check battery condition and charging then switch to ac for relative compression.

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