Strange miss problem

[OLDIE]

Went to the drags and ended the run on 2/3 cyls Oil& water temps ok on drive home no smoke, so pulled plugs comp test all 165-170 psi, installed different plugs had dinner started up on all 4 so went 4 a drive and app 3 k 's it started intermittently and got worse so changed leads ,swapped over coils & leads, same result So installed new #1 LS1 coil still no fix can hear injectors clicking and have spark @ plugs so pulled injectors and tested & cleaned and a cold comp test still 165-170 an all 4 while inj's were out and still no fix
Have an E6X on waste spark and if it was playing up then #4 cyl should be miss firing as well ???
Now after doing all of the above it starts missing on start up which leads me to think that it may be a faulty hyd lifter that is ok @ cranking speeds but not when there is oil pressure ?????

 

[4piknup]

Gap your plugs down more and see if different.

What cylinder is missing? Swap leads around and see if miss follows.

Just yesterday my ute was missing on cylinder 2. It was the coil even though 3 was fine and the coil ht posts had continuity. I thought a dead coil on a waste spark would be dead on 2 cylinders too...

 

[OLDIE]

Gap your plugs down more and see if different.

What cylinder is missing? Swap leads around and see if miss follows.

Just yesterday my ute was missing on cylinder 2. It was the coil even though 3 was fine and the coil ht posts had continuity. I thought a dead coil on a waste spark would be dead on 2 cylinders too...

Jack I have 4 LS1 coils and have swapped leads and coils around as noted in my post and it still is #1 cylinder so the miss does not follow the coil or lead. plug gap .8 mm have been running that gap without probs 4 many years. have spark at plugs and have swapped a new coil in and no difference ( I got 2 new coils just in case so i can plug another in without pulling one out 4 a quick check Have tried both new coils and miss remains)

 

[4piknup]

Ok. Sorry just glanced at your first post. My bad.

 

[OLDIE]

No probs Jack thanks 4 trying to help.

 

[CLuTZ]

Have you ruled out any boost leaks yet??

 

[BMGTZ]

will throw some weird possibilities.

injector seals leaking?
as you said a lifter that pumps up solid
maybe...broken valve spring? I had one that was quiet as a mouse but missed off idle and above. compression test didnt show as it held the valve shut as the compression built

 

[OLDIE]

No boost leaks or no injector seal leaks before or after new seals fitted (sprayed soapy water around them)
Valve cover comes off today to change all lifters to Gen 3 type and fingers xxxed hopefully no broken springs.

 

[OLDIE]

Rocker cover off springs look to be ok.

 

[OLDIE]

Tracked it down to a break in the injector wiring