[Actnaturally]

Hey!

Ive got this unusual problem with my Deville that is when i first start it when its cold it runs and revs as normal.

But after 10-15 minutes it idles a bit rougher and goes really rough when i press down the gas peddal.

It just goes rougher and rougher until it stalls on idles.

Still the same when i start it up again But if i wait a couple of hours its normal again for about 15min.

Ive changed spark plugs, spark wires and the spark coil.

Ive also tried with my buddys Holley carburetor but it was the same problem.

Any ideas and suggestions are welcome.

Excuse my bad english.

 

[drmenard]

The first thing I would check would be mechanical timing weights and springs in the distributor. Make sure they are not frozen or broken. If you set the timing with them stuck it will run like $hit.

 

[Actnaturally]

Thanks for the reply drmenard.

I solved it by checking the Contact Breakers who were far too close! Put em to 0,4 and now it runs normal.

I wonder what could have made them suddenly change their space inbetween.

 

[Submariner409]

Over time distributor points transfer metal due to sparking (which the capacitor ["condenser"] controls to some degree). One point develops a pit, the other develops a small hump. That causes the gap to change.

The best solution is a new set of points and capacitor every 5,000 miles or so. Second best is a points file.

1969 CADILLAC DEVILLE 7.7L 472cid V8 Ignition Breaker Points | RockAuto

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distributor points file images - Google Search

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Actually, the BEST solution is to install a Pertronix Ignitor - a solid-state ignition trigger. No more points.

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