lost compression cylinder 3

[diablogst176]

had just rebuilt my head, started the motor and it was running choppy, tried to drive it and it has no power and every time i hit the gas it starts to stutter. had a guy do a compression test and said there was no compression for cylinder 3. i took the head apart again and expected to find a burnt valve but everything was ok. before this i checked my timing, plugs, plug wires, coil packs. bottom end is fresh has less than 7k miles on it.

 

[BogusSVO]

did you fluid test the valve seats?

 

[diablogst176]

seats are good

 

[BogusSVO]

did you do a valve job on the head? were the seats cut? if so ### the tip height of the valve reset?

 

[diablogst176]

have not done a valve job, but seats on head and valves are clean

 

[BogusSVO]

well there is only so many reasons why you have O compression.....

(1) bent valves
(2) hole in the piston
(3) valves not closing fully
(a) HLAs not bleed properly
(b) incorrect valve stem tip height

 

[diablogst176]

lifters are only thing that have gone unchecked so far, get back to you on that one.

 

[donniekak]

Bleed the lifters. Did you actually fluid test the ports for valve leakage?

 

[BogusSVO]

what have you found out?

 

[agedog2gT]

how are your injectors? this happened to me because an injector went out! let me know.

 

[diablogst176]

yup, didn't do the lifters correctly, she is running great now thank you bogus

 

[BogusSVO]

cool beans. glad to hear.....