Turning the motor over via the starter relay bypasses the need to keep going in and out if the cab. It also bypasses the fuel pump from being activated.
You need to stop the fuel delivery before compression testing. I pull the fuel pump fuse while the car is running and let it die before doing any compression testing. Replace the fuel pump fuse when you're done testing.
![How To Perform a Compression Test - [EASY]](http://i.ytimg.com/vi/3VmmL0YAO14/mqdefault.jpg)
![How To Perform a Compression Test - [EASY]](/img/tr.png)
Turning the motor over via the starter relay bypasses the need to keep going in and out if the cab. It also bypasses the fuel pump from being activated.
sounds good thanks
Your compression gauge may be wrong. I've had 2 harbor freight ones neither one read right.
Well mine works fairly accurate not everything harbor freight is going to work accurate when you purchase it cheap Chinese tools
Do a dry and wet test, wet test add a little bit of oil into the cylinder to seal microscopic leaks.
I did a wet test as well just had enough time to film this
Video is over 2 years old
You need to stop the fuel delivery before compression testing.
I pull the fuel pump fuse while the car is running and let it die before doing any compression testing. Replace the fuel pump fuse when you're done testing.
Did that thanks
Do I need to disconnect the fuel? Wouldn't the fuel melt/clog the catalytic converters?
I would just disconnect disconnect the injectors that way you're not getting any excess fuel into the cylinders