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79 coupe deville hesitation


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is anyone an expert on the 425s? just completely tuned up my 79 and still have a slight hesitation on accerleration. any suggestions?

Rebuild the carb. If that's what it has :D

Lou

94 Seville STS

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The disqualifier is I have no experience with your engine.

My memory of carbs and distributors is fading fast. But what you describe would lead me to suspect the accelerator pump in the carb as a first item to eliminate. Float level and needle valves are the next logical suspects.

After all that is checked and confirmed would be the total advance mechanism in the distributor; as in initial timing, vacuum advance, and centrifigal advance weights and springs for freedom of movement.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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In your carburator is an accelerator pump. Sometimes they have a rubber plunger and sometimes a leather plunger. When that plunger goes bad, you don't get the SHOT of gas you need and you BOG... Replace the accelerator pump it comes in a carburator rebuilding kit.

GMTA Jim

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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We are showing our age guys..

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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We are showing our age guys..

Yes we are. But as we approach that time when we will be able to hide our own Easter eggs, let's not overlook the possibility of a vacuum leak. It's just something to consider even though I'd be inclined to go with the accelerator pump.

BTW, those '79s really hauled a$$.

Regards,

Warren

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