Cylinder problems?

[Kegracing]

What else on the ignition system for this hole? Wires, coil?
I had a plug boot with a crack that did a plug like this one time. Not a dead miss, but not full burn either.
Just guessing.
Good luck.
Ken

[art leong]

Originally Posted by Kegracing

What else on the ignition system for this hole? Wires, coil?
I had a plug boot with a crack that did a plug like this one time. Not a dead miss, but not full burn either.
Just guessing.
Good luck.
Ken

Changed plug wire when I changed plugs.
I'm going to switch injectors and see if I can change cylinders. If not. The coil is the next thing to change.
I don't want to pull the head just yet. Once I do if it is something else I'll have to find it after it goes back together. Want to try the easy stuff first.

[Ed Wright]

Artie, I would swap the front two injectors, and if that isn't it, and if it has individual coils you might swap those too.

Good luck!

[art leong]

Originally Posted by Ed Wright

Artie, I would swap the front two injectors, and if that isn't it, and if it has individual coils you might swap those too.

Good luck!

That is on my adgenda for tomorrow. I've already swapped the injectors. If that isn't it I'll swap coils. They are stock GT Cruiser injectors and stock LS1 coils.

[Phillip marvetz]

Antisieze will foul a plug, You might be better off putting some grease on the threads. That's how it was done at the last import shop I worked at anyhow.

[Mike Taylor 3601]

Art,
If ignition,fuel OK, I would check for valve leakage w/ rockers removed and header,use shop air full pressure and cover intake and ex ports w/hand to feel for leakage,this will show problems that a normal leak down or compression test will not show.
We have even went as far as spraying soap in runners to find valve leaks,it sounds like overkill,but I have found LOTS of guys problems that way after they have changed every thing in ign.and fuel system and have ran out of parts to change and gave up,when they had valve leaking slightly.
A compression issue will cause rich cylinder.
Another ideal is if computer had problem causing injector to spray too much or wrong time.
Have seen computer cause one injector to act up.
Could've damaged lifter if lost oil to lifter during oil filter problem

[art leong]

Originally Posted by Mike Taylor 3601

Art,
If ignition,fuel OK, I would check for valve leakage w/ rockers removed and header,use shop air full pressure and cover intake and ex ports w/hand to feel for leakage,this will show problems that a normal leak down or compression test will not show.
We have even went as far as spraying soap in runners to find valve leaks,it sounds like overkill,but I have found LOTS of guys problems that way after they have changed every thing in ign.and fuel system and have ran out of parts to change and gave up,when they had valve leaking slightly.
A compression issue will cause rich cylinder.
Another ideal is if computer had problem causing injector to spray too much or wrong time.
Have seen computer cause one injector to act up.
Could've damaged lifter if lost oil to lifter during oil filter problem

When I did the leakdown test. The air that leaked seemed to be leaking past the rings. opening the oil fill cap changed the sound.
I'll double check the fuel and ignition functions in the ECU. The fuel is sequential so I could have had a glitch.
I can also adjust the timing in each individual cylinder. I had a spare ECU but didn't ever use it so I sold it a couple of months ago.
If the next few things don't locate the problem. I'll pull the head, and do a cleanup on the valves and seats.