Quote:
Originally Posted by 68gmsee
The dieseling could be the timing or it could be carbon deposits in the cylinders. My 68 with a 250 six would diesel also and I cleared it up with fuel additive every time I filled it up. I think it took three tanks full and three cans or more of Techron fuel additive to finally clear it up.
Re. choke cable. If you're sure it's not a mechanical bind, WD40 on the cable wouldn't hurt it. I'd try it. Shouldn't hurt to spray some on the carb choke shaft also.
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Thank you for the info. That’s funny my old 63’ had a 1967 250 also and it would diesel but went away when I raised the timing to 8• BTDC. I did sea foam in the gas ones as well and went away. I gotta try additive in the gas in this one too, maybe it’ll help