How Do You Perform a Compression Test on the 2.2 Ecotec Motors? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 5 (permalink) Old 07-30-2013, 02:05 PM Thread Starter
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How Do You Perform a Compression Test on the 2.2 Ecotec Motors?



Unplug the spark plugs, and unplug the ignition coils
start the car with the compression kit while stepping on the gas??

what are normal numbers for the cobalts?? Thanks in advance!!!!
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post #2 of 5 (permalink) Old 07-30-2013, 06:41 PM
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For ls/na remove coil and pull first spark plug out. Ss has multiple coil packs.
Its a good idea to remove fuel pump fuse, start it, let it sputter and shut it off.

You need a compression tester. Has a gauge and hose with threaded bit. This hose goes in and screws into plug hole just slightly hand tight.

Have someone jump in and let it crank over a few times and watch the gauge. Usually like 6 cranks. Then disconnect hose from first cylinder and reinstall spark plug. Then move to the next.
For ls, 120+ is good. For ss, 180+ is good

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post #3 of 5 (permalink) Old 07-31-2013, 10:50 PM
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Would you have to do anything different for an LNF? Would it be bad to starve the high pressure fuel pump while doing this? I'm assuming there is no fuse for it since it is cam driven.
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post #4 of 5 (permalink) Old 08-02-2013, 04:48 AM
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The lnf pump is cam driven??

---------- Post added at 07:48 AM ---------- Previous post was at 07:46 AM ----------

You don't wanna keep flooding cylinders as you check for compression either

07 LSJ turbo swap
-to4e 50 trim .63 a/r @ 19psi
-2.5" intercooler system with zzp bov
-2.5" exhaust
-turbonetics deltagate II w/voodoo boost controller
-3" intake
-siemens #60s
-aem uego wideband afr
-HP custom tune


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post #5 of 5 (permalink) Old 08-02-2013, 05:09 AM
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The high pressure one yes. Disconnect fuel pump fuse and/or relay

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