Fuel On Spark Plug

[bogey99]

Just replaced Cylinder heads and its running rough. Figured out that number six isnt burning. Plug is sparking. But is fuel soaked when I pull it. Im thinking injector but it worked fine before the tear down. Any Ideas?

 

[fleck]

Wouldn't the fuel be leaking in through a valve?

 

[bogey99]

Going in when valve opens but not burning. Im thinking that number six injector is dumping fuel. Its the only thing I can come up with.

 

[fleck]

Going in when valve opens but not burning. Im thinking that number six injector is dumping fuel. Its the only thing I can come up with.

That is what I have heard on the subject, that the respective injector is leaking.

 

[bogey99]

Time to tear it back down. The fuel rail on 456 is convienently located under the upper intake manifold.

 

[Viper Command]

do a leak down test as well as a compression test, just to be shure your valves are seated.

 

[Wicked_Sludge]

+1, a compression test is in order to make sure there isnt a problem with the new head.

if you have good squeeze, swap that injector to another cylinder and see if the problem follows the injector.

 

[bogey99]

Fixed

Intake valve push rod not on the lifter. Rocker was loose when I took the valve cover off.
no real guides for those pushrods.

 

[Wicked_Sludge]

the rockers are torqued with both valves closed. IIRC, something like 15ft-lbs.

truthfully, i torqued mine with some valves open (didnt bother spinning the engine over) and they are fine.