Starting issues

[J30001970]

Hello all.

I have a puzzle I can't seem to figure out. I have recently purchased a 1970 J-3000. It needs quite a bit of TLC which I am giving it whole heartedly, slowly but surely. I'm not very mechanically inclined so I don't go to far into tearing into engines, transmission, and wiring. Mostly I just replace and adjust where I can. After getting the pickup I found out that the alternator and the battery had to be replaced. Not a problem, I did that. Now I'm finding that when I take the Jeep for a drive around town (which is once a week, on the weekend) every time I stop and turn off the engine it takes longer to get started with every stop until it just won't start at all (usually after after the 3rd stop). But if I just drive around without stopping, until I get home, I can turn it off and it starts right up again. While I'm driving there is no loss of power like there would be from a low battery or a bad alternator. I'm at a loss and could really use some words of wisdom. Any help would be appreciated.

Thanks in advance!

[deckroid]

I had a similar issue when I first bought my 1984 Grand Wagoneer. I replaced both fuel filters and found a vacuum leak from a hose behind the carb. Now she only is a little temperamental on starting when it is really cold.

I am sure others more mechanically inclined than me can also give some pointers.

[tgreese]

Certainly as the engine sits and retains heat (no cooling flow, no fan air) it may become harder to start due to excessive ignition advance. Does it take a long time to fire or does it simply crank hard? The engine will always be harder to crank when its hot. If you create the effect and the engine cranks slow, then remove the coil wire and it cranks like it's cold, that's your problem.

If so, I would first make sure the battery, wires and starter were in top shape. The normal harder-cranking from the engine heat might only be problematic when the wires/battery/starter are below par.

Another problem that could be heat related is the coil or plug wires. A spare coil is a good part to keep in the Jeep, and handy to see if that's an issue. Plug wires are often long-neglected on cars that people sell. I would advise replacing all the consumable ignition parts, belts and hoses (especially heater hoses!) on any new-old car.

[Herk]

Crank with half throttle when hot starting an engine with a carburetor. What happens, especially with today's E10 gas blends is the fuel in the carb is boiling (or has boiled away). Aluminum carbs are worse than zinc. Cranking at half throttle pulls more air through the carb and cools it down a bit.

[J30001970]

Thanks for all the input. I'm looking into some of the suggestions that were given here. I appreciate your time and advise. I was hoping to find the issue today but it's raining hard and unfortunately the truck is parked out in the weather. I will post and let you know what I find out.

Thanks again.

[J20Hunter1]

Just curious where you located ? I have a 1969 J3000 barn find all original non molested

[J30001970]

J20hunter1, You have an 69 J3000 barn?

[J30001970]

Just curious where you located ? I have a 1969 J3000 barn find all original non molested

What do you mean you have 1969 J3000 barn?

[J20Hunter1]

Barn Find sorry about that .If you need any references on wiring or anything ,My truck has not had wiring hacked .Just thought I would offer

[J30001970]

That's a great barn find. I would love to take a look. Don't suppose you live anywhere near Oregon do you?
Does your truck have a bench seat? Mine came with bucket seats and I'd love to find a bench instead. I believe they originally came with bench seats. Plus a bench is a lot less expensive to have upholstered than 2 buckets.

[J30001970]

Barn Find sorry about that .If you need any references on wiring or anything ,My truck has not had wiring hacked .Just thought I would offer

Thanks for the offer!