Hello everyone, looking for any suggestions. 76 highboy 460 engine. Everything under the hood has been replaced. I don’t drive it much but I start it at least once a week and let run about 15-minutes.

Problem, the last time and today it was difficult to start. Acted like it wasn’t getting fuel. I pump away and nothing, just crank. Take my foot off the accelerator and crank and finally starts. Today same thing, but when it acted like it was going to start I gave it a little throttle and just cranked. I took my foot off and it started.

Few days ago drove it around the block and it was dying coming to a stop, I stopped and it dies. Turn the ignition and nothing. Moved ignition wires and it started.

today same thing, but I had to put into neutral to start, but each time slowing down to make a turn it wanted to die, tried keeping foot on the accelerator n it worked a couple times but the 3rd time it died. Turn key nothing. Messed with shifter n moved wires, not sure which worked but I had to get out of the road.

got back home and rough idle had to put in neutral to keep it running. turned idle up a bit and idles okay, put into gear and it’s rough. Carb was rebuilt months ago for the second time and it has plenty of gas.

don’t know if I have one or two issues. Any ideas I’m all ears. After this it’s going up for sale, I just do have the time that’s required for it and kills me to see it sit there.

thanks

 

With just that to go on any diagnosis is basically a guess. it sounds like when you're coming off the idle circuit you're going dead. this would be a carb problem of course, being rebuilt doesn't mean much.

Might do a thorough check for vacuum leaks.

 

Check for vacume leaks, with it running CAREFULLY spray a very little amount of carb cleaner around the outside of the carb. If the idle jumps when you do it, gasket/vacume leak. What kind of carb? Is the choke connected elec/vacume or manual? And connected correctly?

Sounds like the Nutral Safety Switch is loose or out of adjustment. The NSS is on top of the steering column. Could have back bleed from the carb. https://www.siliconeintakes.com/liqu...d--p-9581.html

Idealy let it idle/run/take for a spin until the thermostate opens fully. Cycle the heater switchs to get the antifreeze flowing thru the heater core.

 

Thanks for the replies, I’ll try n answer some suggestions. I didn’t check for vacuum leaks, the neutral safety switch seems to be fine, this is a 4barrel edlebrock, I do get it to temp before driving. I’m going to check the shifter, I do have to make sure its way up when I put in park however, unless I’m wrong, and some of you may know better, I don’t think the neutral safety switch will cause the dying issue or will it. I took it on the hwy cruises at 60 for a few miles no issue but it did act up when I slowed to make a u turn without stopping to make the turn. Thoughts?

 

Personally, I would start with at least 2 oz. of Seafoam per gal. start it up and let it run, I've had that issue with one of mine that I didn't drive a lot, carb was slowly getting gummed up, gave it a good dose of the foam and let it run and it slowly got better until it was running good. If that doesn't help it, then I would probably pull it for a rebuild, the gas nowadays, goes to crap pretty quickly IME, I now try to remember to add Seafoam to all my rigs.

 

Thnx. I use HELIX fuel treatment. Awesome stuff. I also use non ethanol fuel and I keep it fresh. Thnx for the response

 

when someone says Edelbrock bells go off. if you have another carb put it on and see if your problems go away. or if you just want a huge upgrade get a 4160.

Rule out vacuum leaks and everything else but don't be surprised if it's the carburetor.

 

My luck it will be. It’s been rebuilt twice.

 

I have an Eddy 750; on a 460...also running non ethanol. Edelbrocks don't just go out of tune from sitting. (Mine doesnt).Keep the Edelbrock it's probably fine. Look for vacuum leaks.

 

No the NSS should only prevents the truck from starting, unless it is in Park or Neutral. I have never seen a NSS being out of adjustment shut off a truck while it was running or going down the road.