What do you make of this timing issue? - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 01-06-2018, 05:51 PM Thread Starter
 
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What do you make of this timing issue?

A couple months ago I got rid of the Holley carb that was on my 68 and replaced with a QJet. When I did that, I checked my timing to make sure all was dialed in, and it was about where I wanted it - 36 all in and ~15 at idle. I had made a big timing adjustment to 36/15 a few weeks before the new carb.

Last week, I did an oil change, replaced plugs and did a compression check - 185-190 all around.

I put a timing light back on just to see make sure all was dialed in, and when I get the engine to around 2500, the light goes intermittent. I get a nice steady flash at idle and on up through 1000's, but then somewhere just north of 2k, the light starts going intermittent.

I put the light on another car (68 chevelle 383 stroker) and I get a nice steady flash all the way up through the RPM range.

The engine doesn't sound unusual and runs pretty dang good. But now I'm thinking something is a miss.

Am I losing a cylinder at higher RPMS? I'm thinking I must not be firing right - should I be looking at a new distributor?

Also - I'm running an HEI distributor now...

What do you think??

Thanks for any insight...
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post #2 of 2 (permalink) Old 01-14-2018, 08:25 PM
 
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Sounds like it is the timing light, since the engine is running fine. It could either be a pickup or power / ground specific to your car (since the other car worked). Have you tried a different timing light ?

1965 GTO Convertible 3 speed tri-power drum brakes originally

Current setup:
400 cu in with tri-power
4 speed Muncie
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

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