454 Vortec P0300 Multiple cylinder misfire code. Troubleshooting and solution.

[Mangonesailor]

I think those housings need to breathe to stay clean. My gear was WAY worse than yours, it was knife edged and I was physically unable to get CMPRET set better than 29 degrees. I've done a cam sensor and even run it unplugged with zero effect. My RPM logs are flawless so I have a hard time thinking it's the crank sensor.

What's your cam gear look like then?

 

[Supercharged111]

What's your cam gear look like then?

You must be registered for see images attach

This was October 2014.

 

[Mangonesailor]

dizzy gears

What's your camshaft gear look like then?

 

[Supercharged111]

What's your camshaft gear look like then?

Beautiful, cam was replaced in 2015. But the one I took out was fine.

 

[smokymtn65]

@Mangonesailor You mention Dash Command do you use it with TQpro or do you run it separate?

 

[Mangonesailor]

@Mangonesailor You mention Dash Command do you use it with TQpro or do you run it separate?

I use it separately. Because I could not get the data from the crank offset to display in torque pro.

So I used dash command just to check that and torque pro to display misfires (simpler).

 

[smokymtn65]

I use it separately. Because I could not get the data from the crank offset to display in torque pro.

So I used dash command just to check that and torque pro to display misfires (simpler).

I will have to dig in a little more to get it to display like you did, Are you using any plug ins? Been using it on my GMT900 I have a misfire issue with and Tech2 will not recognize the CANDI. Thanks Need to get one of the two running right! LOL

 

[Mangonesailor]

I will have to dig in a little more to get it to display like you did, Are you using any plug ins? Been using it on my GMT900 I have a misfire issue with and Tech2 will not recognize the CANDI. Thanks Need to get one of the two running right! LOL

You probably need the GM/Opel plug-in. I think I had to use the plugin for new PIDs when I swapped computers.