67 L79 hesitating

[Keith B.]

On my dads 67 L79 that’s all restored and top flight. Got it out the other day to warm the motor up to change the oil. He got on it and on the left side exhaust you could here it popping and the motor was hesitating. On the right side exhaust it sounded fine. When we got home we pulled the left side plugs and they were a little fouled. Cleaned them up and went out again. It was fine for a little bit. Then started to do it again. The car has T.I. where else should we look the car only has 1200 mile since it was completed over 5 years ago.

[John H.]

Re: 67 L79 hesitating

What spark plugs are you using?

[Keith B.]

Re: 67 L79 hesitating

What spark plugs are you using?

AC N 44
AC Declo 44

[John H.]

Re: 67 L79 hesitating

I can't help you with T.I. issues, but I've been using AC R45S plugs in all of my small-blocks ('57 270, '67 300, '69 Z/28) for many years with no fouling issues; did have fouling issues around town with 44's.

[Clem Z.]

Re: 67 L79 hesitating

check the plug wires with a ohm meter to make sure you do not have a open.