We just got back from a week long tour in our T and midweek the car started running really bad. I checked the plugs, 1 and 2 were heavily carbon fouled, 3 and 4 looked great [champion 25].
I changed the front 2 plugs and the car ran OK. When I got home I checked 1 and 2 again and they were carbon fouled again. I remember reading somewhere that not running a hot air pipe is a likely cause. What are your thoughts and maybe some other thing to check. Thanks, Steve
You have a vacuum leak on the rear cylinders. Might be a bad copper gland or a cracked intake. You have richened the mixture to get rid of the lean condition on the rear two, causing fouled plugs on the front.
Squirt some WD40 around the intake to find the leak with the engine running.
Yup. Concur. 2 cylinders 1 port feeding both.