The Stovebolt Site Forums The Shop Area General Truck Talk 216 CARB ADJUSTING

I just rebuilt my leaky rochester on my 216 and cured all the spitting and slobering of fuel all over my intake,but it has no throttle response what so ever!it idles good and starts good,but when I hit the gas it stumbles real bad and if I dont get off the gas it will go dead,if I bring the rpm's up slow then mash on it it does allright,I've try'd adjusting the air/fuel mix. screw and it did a little better,what else do I need to try,am I just miss'n that sweet spot in the air/fuel mix when I'm adjusting?I know the mighty 216 is not no quick rev'n performance motor anyway but it used to do a whole lot better than it does now,maybe I should have just wrapped some rags around it and kept on get'n it :rolleyes:

is this after she's warmed up a little, or is it right after you've fired her up?

-Brendan

this is after she's all warm and toasty,after I set the idle I let it run for a good 15 min. before adjusting on the a/f mix,I just came back inside from try'n to adjust on it some more,no luck!the kit had 235 listed on it but every thing was there for this carb,the jet in the kit was the same as the jet I pulled out of the carb,maybey a smaller jet instead of the one in it?

Is the vacuum advance on your distributor working?

Bob

Accelerator pump.

vacuum,mmm didnt think of that,guess I'll start checking on that and my fire to see if thats all up to par,thanx

Check the carb spacer to be sure that it is on right, if the notch is not in line with notch in the carb base you will never get it to run correctly. Search the site this is a ongoing problem with these carbs.

Don't use the base gasket that came with the kit unless you drill out the holes to match the base. It sounds like your power valve is being starved for a vacuum signal. If you have the hard rubber spacer on the manifold you don't need a gasket anyway.

I agree with Ted. With the engine off look down the carb throat & work the throttle. Each time you open the throttle a squirt of gas should go in the throat. Also check your float level. If it is too low it will cause this problem. Notice what size main metering jet is in it. It should be stamped on it. It is usually is 53-55. Sometimes these rebuilders put in any part that happens to be handy.

checked vac. advance,working,took the base gasket that came with the kit off and threw it across the yard,put carb back on let it run a good 15-20 min.,had to re idle it,was idleing to low,got in and stomped on it,slight hessitation/stumble,adjusted a/f mix,got in and stomped on it again;2,346.5 times better,barely any hessitation at all,If I can get that little bit out I'm ready to light the tires up all the way down the driveway(it's pretty short and gravel)thanx fellas!

Burntclutch,
there is only one mixture adjustment and it is the idle mixture adjustment. It has very little to do with anything above idle.

The accelerator pump is the first place to look. Like the man said, with the engine off, giving the throttle a twist should cause a little sqirt of gas to come out. This must work or you will get those symptoms.

Ted & Wrenchbender are right. You have classic lean condition symptoms. I'd bet it's the accelerator pump.

I'm on it,thanx fellas