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Author Topic:   Timing Problems
12modracer
Member
posted April 28, 2004 09:47 PM
I have a 406 with roller cam. Timing is set at 36 deg locked in. As you rev the motor up the timing starts retarding gets around 20 deg at 4000 rpm. Put in a new MSD Distributor and box. Still didnt fix problem so i called MSD they said it was interference problem. So we started unhooking tach and lights. Still no fix. So i jerked off timing cover today and cam button was installed and everything looked ok. Replaced stock dampner with silicone dampner and still no fix. I am about to pull my hair out with this one. Even tried a MSD timing light today. Any ideas would be appreciated. Thanks.


sdhnc29
Member
posted April 28, 2004 10:54 PM
It's probably the cam walking forward, even though you have a cam button. If you do not have to button positively locked into place so that cam will not move forward, this will cause your problem. Are you sure you don't have too short of a cam button? There are two different length button's available. Do you have a positive stop outside the timing cover on the water pump to prevent the cover from flexing? Make sure you have a bronze distributor gear as well.

The only other thing that I can think of would be if you have the mag pick-up wire's and the coil wires coming from the MSD running parallel in the same loom, or crossing at any point in your ignition system. Either of these problems will cause false triggering of the MSD.

Steve

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