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When the cylinder seems to be misfiring (on quick way to know this is by putting your hand on the exhaust, if is not blowing steadily a misfire is the most likely cause) a power balance [http://www.balanceofpowers.com Power Balance] test could tell us which is the cylinder misfiring.

Difficulty: Easy
Instructions

Things You'll Need:
Basic Tools
1
When the cylinder seems to be misfiring (on quick way to know this is by putting your hand on the exhaust, if is not blowing steadily a misfire is the most likely cause) a [http://www.powerbalanceforsale.com Power Balance] test could tell us which is the cylinder misfiring. Proceed with the following steps.
2
With the engine running, start disabling each cylinder. To disable a cylinder, either disconnect a coil, or an injector. The most professional way to do this is with a scan tool.
3
Each time you disable a cylinder you should see a drop in the RPM. If there is not a drop in RPM with a cylinder, then that's the cylinder at fault.