I read some articles on adjusting the carb at idle, and I turn it in until the rpm drops and then turn it out, but the rpms never seem to drop .I turned it 13 1/4 turns and still no rpm drop. I am using my timing light , which shows rpm also, it kind of jumps arund alittle. I am not sure if it is suppose to or not, but still by listening to the engine it doesn't drop in rpms.
Thanks for any replies
Dave

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81 Dodge D150
It looked easier in the book .

Many carburetors made after 1967 have idle circuits designed such that they cannot be richened beyond a certain degree by means of the idle needle. With those, you have to do a one-sided adjustment by reference only to the lean drop-off point. Carburetor operation and repair manuals (and some training movies) as well as adjustment procedures are posted here for free download.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks Dan , have you used the Colortune , it looks like something to get.
I have also noticed when reving up the engine some ,the rpms drops kind of slowly, I will have to figure that out also. would dropping the gap on my plugs a little below .45 help.


Dave

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81 Dodge D150
It looked easier in the book .

Changing spark plug gap won't alter the speed at which the engine returns to idle. Perhaps your carburetor is equipped with a dashpot.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

My carb is a Holley 1920 #7585 , and have you used the colortune before.



Dave

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81 Dodge D150
It looked easier in the book .

So no dashpot on the carb. Fortunately for you, that 1920#7585 is highly tweakable to get it to work just the way you want. See the 1920-specific threads linked off the topic I linked above.

Colortune: Yes. It's a good way to dial in the adjustment, and to check cylinder-to-cylinder mixture distribution.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I have a R7585 EconoMaster also and it idles great at 1 7/8 turns on the mixture screw with a #56 jet up to a #612 jet.

You may have a pretty bad vacuum leak throwing it off. Be sure you have the correct carb to manifold gasket.

Take a look at my plugs on the red link below. That picture is with the #56 jet.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I did find that one of the bolts that hold on the carb was not all of the way tightened down,I guess it works its way loose over time. I am not sure if that is the problem , but was a problem.
Thanks for the replies
Dave

_________________
81 Dodge D150
It looked easier in the book .

Get a grade 8 lock washer or even a star washer and put it under the hold down nuts. The base gasket will shrink over time. Makes for a nice little vacuum leak and rough idle so you tend to richen up the mix over time. Just keep the 9/16 box end wrench handy and check it now and then.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG