WRXYBOY

iTrader: (2)

Does anyone know how to do a compression test? As well as have tools to do them. My car idles really bad and i just wanna see if my compression ratios are off. Thanks

Imprezer

iTrader: (9)

There are two ways of doing it.

1. Compression Test
2. Leakdown Test

Both require special tools.

Compression test is a way of measuring engine's compression by cranking it and using a peak-hold gauge.

Leakdown test is a way of measuring engine's MAX compression by manually pressurising the combustion chambers through the sparkplug hole and seeing how much pressure the chamber will hold before it starts to leak.

Both tests are equally important and require special tools.

WRXYBOY

iTrader: (2)

i think i just need to do a compression test ive been running really rich lately and the idle has been getting alittle sloppy. So i just wanna see if my rings need to be replaced.

loosenut

bad rings wont make you run rich,just burn oil. id check your o2 sensors, IAC motor/valve,MAF/MAP sensor.

gpatmac

iTrader: (3)

If you suspect you're running rich, the first place I'd check is all along your intake tract...paying special attention to your uppipe then to your IC hose connections.