79 jeep cj5 spark knock. - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Engines & Drivetrain > 79 jeep cj5 spark knock.

Baseline 4x4 Lifetime Warranty 4340 Chromoly Axle Shaft KiClayton Off Road WJ Long Arm Kits!Clayton Off Road - JK Prototype Gas Tank Skid

Unread 09-29-2013, 10:16 PM   #1
Registered User
Join Date: Sep 2013
Posts: 9
79 jeep cj5 spark knock.

I have a cj5 with a 258. Bbd carb. 3 speed trans.
I blew the radiator one day and overheated to prolly 250?? . Since then I have noticed a very loud knock from the motor once a operating temp, but only while revving up. Nothing at idle. Un hook the vacuum advance. Noise goes away. Maybe its advancing the timing too far. ?? What is the tollerance on vacuum advance? ?

BrandonG89 is offline   Reply With Quote

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.