Not firing correctly

[Her1970]

I have a problem with #1 and #3 not firing correctly. To hear the car run you really cant tell and there is no backfiring or bogging down. Its a 360 with stock everything except cam and Mildon gear drive. I did install a Comp 268H cam. The gear drive was installed by the previous owner. It has new plugs, wires and cap. All the other plugs are nice and golden brown, but #1 and #3 are BLACK? Any suggestions.

 

[Burntorange70]

Check the fiering order. See if #1 and 3 are crossed. If that ant it try installing new plugs in to the #1 and #3 holes. Some times you just get a bad plug.

 

[Her1970]

This will be the 2nd set of plugs. I will check the wires again to make sure they are not crossed, but I think they are correct.

 

[fishy68]

Run a compression test. It's possible you have a head gasket leaking or blown between the cylinders. If both cylinders are equally low that's the problem.

 

[3404spdvaliant]

Do you get any kind of smoke?
What ever you do if, it is a blown head gasket, DON'T run it anymore after finding out or you could burn up/cause lil cracks between the chambers.

 

[Her1970]

No smoke. I will run a compression test just to make sure. I will let you know my findings.

 

[3404spdvaliant]

No smoke. I will run a compression test just to make sure. I will let you know my findings.

make sure to have #1 plug out while testing #3 as you will also wanna have # 3 out while testing #1.

After this say you don't find a problem with the compression then pull the cover and see if the cam lobes are wasted by watching for valve lift thats less then the rest.

 

[C130 Chief]

You could be pulling oil from the lifter valley. Try retorquing the intake.