1985 Chevy Pick Up Problem???Need Help!!!

[Lynxh]

Hello all,
this is my first post on this board, several days ago I bought a restored 1985 Chevrolet Pick Up. It is a short wheel base truck with a 3" lift in the front and a 4" lift in the rear anyways the truck starts excellently and idles real well when I put it in gear and apply the fuel the motor "bogs" or dies down and then shuts off. The firing order is correctly hooked up, the trucks exhaust smells of unburnt fuel. Do you think this is a carb problem???? I was thinking it may be but figured I'd ask someone here with more knowledge then myself in carbs. Thanks for any help you can give me.


Gerald

[Chevy-SS]

Wow, there are so many dang things this could be. I would start by looking at the stupidly small stuff. For instance, do you have a fuel leak? How about a plugged fuel filter? That will give sypmtoms as you describe. Also, look very carefully at all vacuum hoses, as a big vacuum leak will also casue problems like that.

Are all your tune-up items good? Air filter, spark plugs, wires, cap, rotor, etc?????

You will typically get gassy smell out exhaust, especially on these older vehicles.

[J-Ri]

does it only do that when it's cold? If it does, the simple answer is let it warm up first (that's what I do). The more complicated answer is check the choke components until you find why the choke isn't coming/staying on.

[Chevy-SS]

Mybad, forgot about sticking/broken choke. That could easily be the whole problem. Make sure that choke is opening up after warm. There is also a choke pull-off diaphragm which partially opens the choke right after the engine starts. On a real cold morning the bi-metallic choke spring could be so tight that it won't allow hardly any air into the engine. The choke pull-off assures that the engine will be able to get some air. Easy way to test is start engine cold, you should see choke open up immediately after starting, about 1/4 inch or so. If the choke is shut tight then it is probably the pull-off. Usually available at any parts store for a few bucks.

[J-Ri]

Yea, pretty cheap... I think I paid with a $5 bill and got change back. Also make sure there's no leak in the vacuum line going to the pulloff. To test the pulloff, depress it fully and put your finger over the vacuum line fitting and let go of the linkage. It should move out just a bit, then stay in the same spot.