7.4L Bravo intermittent misfiring, & sometimes starts and runs fine?!?!?

[alldodge]

There are two Merc bulletins out in prior years about bad distributer modules. They can check good but cause issues. One is they won't start and the other is an intermittent spark issue.

 

[syuhas85]

There are two Merc bulletins out in prior years about bad distributer modules. They can check good but cause issues. One is they won't start and the other is an intermittent spark issue.

So allDodge I decided i was gonna do Compression and fuel pressure today.......Picture below explained all my troubles.... 30 first test/ 0 second test / 40 third test / 0 4th...... Im guessing broke spring.

 

[alldodge]

Could be, and also maybe damaged valve. In any case the motor is showing it's tired

 

[syuhas85]

Could be, and also maybe damaged valve. In ant case the motor is showing it's tired

Yea, definitely could be its either a valve or valve spring I'm hoping just spring I can change that fairly fast. I wont know till I get the Valve cover off, Once I get the Valve Cover off Ill do a leak down test will see who's not doing there job..... its almost like a spring is weak for example.... The very instant u turn the key that cylinder starts to build pressure gets up to 30-40psi and that's it after that you can hear there is no more pressure so the valve is staying open or its broken Ill post updates once I tear her down....