Timing marks jumping around too much - can't set timing
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Joined: Jul 2002
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From: Orlando
Timing marks jumping around too much - can't set timing
I can't set timing on my 466 because the timing mark is not steady (jumps back and forth so much I'm not sure what timing is set to). Engine has MSD 6AL with spark retard box. Mallory Unilite distributor with vacuum advance. Cam is 226* @.050 and .510 lift. Idle is lopy and contributes to timing mark movement I believe.
I have a Snap-on timing light with push button advance/retard and built in tach function (has display window on timing light). It does not display RPM correctly with the MSD ignition and may also be responsible for the jumping timing marks (works fine on non-MSD ingintions).
MSD web site for troubleshooting on timing fluctuation says "do not use an advance type timing light" (use their brand MSD light). I don't mind buying their light but I would also like to check timing advance and my damper marks don't go high enough.
What brand timing lights are you guys runing MSD ingnitions using? If a new timing light does not cure the jumping timing mark - what should I look for? Engine has about 500 miles on it.
Thanks
Mike
I have a Snap-on timing light with push button advance/retard and built in tach function (has display window on timing light). It does not display RPM correctly with the MSD ignition and may also be responsible for the jumping timing marks (works fine on non-MSD ingintions).
MSD web site for troubleshooting on timing fluctuation says "do not use an advance type timing light" (use their brand MSD light). I don't mind buying their light but I would also like to check timing advance and my damper marks don't go high enough.
What brand timing lights are you guys runing MSD ingnitions using? If a new timing light does not cure the jumping timing mark - what should I look for? Engine has about 500 miles on it.
Thanks
Mike
Thread Starter
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Senior User
Joined: Jul 2002
Posts: 313
Likes: 0
From: Orlando
Timing marks jumping around too much - can't set timing
It was my Snap-on Timing light. I couldn't read the MSD ignition spark pattern. Bought new MSD timing light and all is fine now. Still can't get my stock tach to work with MSD.
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