is the carb clean and is the accelerator pump working if carb is not clean mixture can get to lean and give engine knock 75000 miles can be enough to have a lot of carbon build up in the cill heads becouse this knock can happen Remco The netherlands ----- Original Message ----- From: "Rex Crews" <rexcrews@xxxxxxxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Sunday, March 07, 2004 11:20 PM Subject: IML: Spark Knock in my '59 > Hi, Guys and Gals, > > I would like some feedback on spark knocking or pinging on my '59. I have > changed the points, checked, set and re-set the timing, and bought different > gasolines. Still, I have a weird problem with spark knock on acceleration > and can even hear it at high speeds. The odd symptom is, though, that the > problem is not consistent. One day it doesn't ping at all, and the next day > it is terrible. My mechanic thinks the distributor shaft is worn and is > shifting the timing, but the car has only 75,000 original miles. Any > suggestions about the cause? BTW, my 60 and 61 Imperials have zero spark > knock.... Thanks in advance. > > Rex Crews '59 and '60 Crowns, '61 Custom > > >