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1979 Coupe Deville
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2 Posts
Discussion Starter #1
Hey guys! I just registered to the forum today, and had a quick question. My '79 coupe deville is in great shape (garage kept), and has around 86k miles now. Iv only had a few minor problems, and my dad and I were able to fix them. However, yesterday I was commuting to college (roughly 20 mile trip there, and 20 back), and once I hit around 45-50 MPH, the car started to chug a bit. There was a very strong wind, so I thought it might have been that, but this morning I noticed the problem again, but it was much more noticeable. If I keep on the accelerator, the chugs get longer. Any advice on this would be greatly appreciated, we arent too sure why its doing this.

Thanks all, let me know if you need any more info!
 

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1979 Sedan deVille d'Elegance
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4,153 Posts
Welcome to the fun! :)

I am hardly a mechanical expert, many on this forum should have good ideas for you. Are you using ethanol-free fuel? My 79 thrives on ethanol-free premium.

Good luck and glad you are enjoying driving your Coupe deVille!
 

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1980 FBC
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3,198 Posts
There are a lot of things that could do that. One is an almost broken wire on the distributor's pick up coil. They need to flex whenever the vacuum advance moves so are very sensitive to throttle position. A gentle tug on the wire usually finishes it off as a test.
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,738 Posts
I agree. Change the fuel filter first! To do this you MUST have the proper line wrenches or you'll damage the inlet pipe at the carb. Place the two wrenches on the fittings then bang the wrench with your hand. Dont just pull on the wrench, you'll round off the inlet nut. And on your next post list the complaint in your title. Not what car you have. "My car bogs, misses at 65?" for instance.
 

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77 CDV, 06 DTS III, 69 FWB
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10,022 Posts
As stated, check for proper fuel pressure and flow under throttle. If fuel pressure is correct, move on to spark. Check plugs, wires, distributor, and coil. If all is well there, examine the carb for proper setting and operation. As a last check, be sure there are no restrictions in the exhaust.

Good luck!
 

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1979 Coupe Deville
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2 Posts
Discussion Starter #7
Thanks for all the advice guys. We changed the fuel filter, and went ahead and cleaned the carb as well (which looked really dirty). Commuted yesterday and today, no issues at all. Really appreciate the help, this was causing a lot of unneeded stress.
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,738 Posts
Thanks for posting the fix! As an added check, remove the air filer and rub your finger under the carb inlet. It should be dry! no raw fuel. Wouldn't hurt to tighten the carb bolts holding it to the intake manifold. They tend to loosen up with heat.
 
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