Leo66
Member
Help!
I have a 66 Riviera with a 425. 29,000 original miles. When I accelerate slowly there is a knocking in the motor. More of a knock than a ping. I put premium through it still there. Replaced the lifters they were fine. Just happened to leave a vacuum line for the heater controls off after the start up from replacing the lifters. No knocking. Put the vacuum line back on..it knocks. Thought the vacuum advance was stuck or bad. It all checked out ok.Reset the dwell and timing to 30 degrees(dwell) 7 1/2 degrees advance timing with vacuum disconnected per my manual. Hook everything back up still knocking. The car runs great except for the knocking. The slower I accelerate the more pronounced it is.Just a touch frustrating to say the least. Any ideas would be very appreciated
I have a 66 Riviera with a 425. 29,000 original miles. When I accelerate slowly there is a knocking in the motor. More of a knock than a ping. I put premium through it still there. Replaced the lifters they were fine. Just happened to leave a vacuum line for the heater controls off after the start up from replacing the lifters. No knocking. Put the vacuum line back on..it knocks. Thought the vacuum advance was stuck or bad. It all checked out ok.Reset the dwell and timing to 30 degrees(dwell) 7 1/2 degrees advance timing with vacuum disconnected per my manual. Hook everything back up still knocking. The car runs great except for the knocking. The slower I accelerate the more pronounced it is.Just a touch frustrating to say the least. Any ideas would be very appreciated