Vintage Mustang Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
678 Posts
Discussion Starter #1
I know when lead was in the mix you could tell buy the color of the plugs. How do you tell with unleaded gas if you are running lean. Without an oxygen sensor. I want to be sure jet size is correct in the carb.
 

·
Registered
Joined
·
4,670 Posts
Best way is to take car out were you can run it wide open and shut engine off and put in neutral at speed. Pull over and pull a plug and see how it looks.


69 Mach 1 427 Windsor
 

·
Registered
Joined
·
10,587 Posts
Best way to tell is to pick up a service manual which has a plug reading chart (the Hayne's manual does and likely there are others) and then proceed to test the engine as outlined by the other posters...

In the interim, perhaps this chart will do.

If you have any questions after performing the procedure, post...
 
1 - 4 of 4 Posts
Top