LT5 Misfiring at All Speeds

[Paul Workman]

Food for thought...

After I first got my Z, it had a slight "miss" on one cylinder that wasn't so apparent under heavier throttle - if much at all. Turned out to be a burnt valve, stemming from a weak primary injector!

Just sayin.....

[Johnny5]

I replaces my injectors when i first bought it, all coil packs, wires, and 6 spark plugs. The bog is iccasionally only under slight throttle. Hopefully its a plug i havent changed.

[Johnny5]

Originally Posted by Paul Workman

Food for thought...

After I first got my Z, it had a slight "miss" on one cylinder that wasn't so apparent under heavier throttle - if much at all. Turned out to be a burnt valve, stemming from a weak primary injector!

Just sayin.....

That's scaring me. I have to get some universals together to change the back 2 plugs and pray that it was an old plug causing it.

[XfireZ51]

Watch this video (go to 5:06). Some things sound familiar, maybe?

Also, very interesting comments below the video regarding the effect of oil in the throttle body.

How to Install the RX Oil Separating Catch Can System for a 2014-Corvette

[Johnny5]

Originally Posted by Paul Workman

Food for thought...

After I first got my Z, it had a slight "miss" on one cylinder that wasn't so apparent under heavier throttle - if much at all. Turned out to be a burnt valve, stemming from a weak primary injector!

Just sayin.....

Hey Paul it turns out it was just my plugs, but what did you do to fix your valves. Were you able to buy a single valve? did you have to buy a whole head? and where could you even purchase valves or a head?

[A26B]

Originally Posted by Johnny5

Hey Paul it turns out it was just my plugs, but what did you do to fix your valves. Were you able to buy a single valve? did you have to buy a whole head? and where could you even purchase valves or a head?

Pay us a visit & see what we have.
www.jerrysgaskets.com

[Paul Workman]

Originally Posted by Johnny5

Hey Paul it turns out it was just my plugs, but what did you do to fix your valves. Were you able to buy a single valve? did you have to buy a whole head? and where could you even purchase valves or a head?

Replacing a valve in an LT5 requires the motor to be pulled to facilitate the cam phasing, etc., after the valve(s) are serviced/replaced. So, I opted to complete my porting at that time as well.

As it happens, I had a porting mishap resulting in replacing one head out of convenience; a "do-over", if you will.