Last two mechanical issues (so far)

[Jfwh1tt]

Howdy! Been working on getting my truck running right so I can move into it as my daily driver. So far, I've set the timing, rebuilt the carb, tightened my belts, filled my fluids, and fixed my leaks. From what I've identified so far, I only have two mechanical problems left.

First, when I get on the gas very hard, it hesitates and sometimes dies. If I'm gentle with it, it runs great, but when I goose the throttle I have the hesitation. If I back off a little when it happens, it will hesitate then take off. Originally it attributed it to the timing being off, and the vacuum advance was not hooked up. I've fixed, or so i think, both of those issues. I can not get on it a little more before I have the problem. Any thoughts?

The second issue is the, kick down cable. It was not hooked up when I bought the truck. I attached it, but quickly found it hold the throttle open. That's likely to cause a bad day when the throttle sticks.

[truckster]

Your hesitation issue sounds like the accelerator pump in the carb isn't working.

The kick down cable should return on its own when released. Does it slide in the cable housing?

[Jfwh1tt]

I would expect the accelerator pump to work just fine, It was replaced when I rebuilt the carb. When it's just sitting there idling and I get on it, it works fine. Under load is when it's an issue.

[Jfwh1tt]

Along with these issues, I need a new oil pan. Mine leaks, but has been patched temporarily. I've been on Summit racing, and see there are two styles or rear main seal styles. What's the difference between 1-piece and 2-piece, besides the number of pieces? Does it matter which one I get?

[Longhorn 70]

IF yours is like mine it is the 2 piece. It goes in the rear main bearing housing. The one piece actually is on newer engines 86 and up I believe, and is behind a bolted on flange behind the flywheel.

[domeier]

Your vacuum advance diagram might be leaking. Could be why it was disconnected.

[Jfwh1tt]

Thanks. You guys are awesome!

The hesitation was indeed caused by the accelerator pump. It was replace when rebuilding the carb, and works just fine. However, it was not properly adjusted. After a little tweaking, it runs great. Once I hunt down a little electrical gremlin, so my brake lights and running lights quit popping fuses, I'll have me a new daily driver!

Any idea what kind of mileage these things get with mostly stock motor?

[tinsoldier]

The only way to know what type of rear main seal is for you to drop the tranny and take a look at your crank. A counterweight at the end of the crank will indicate you need a 2 pieces and a completely round crank means you have a 1 piece.