when I first shut my 84 s-10 off, it spits and sputters?

Question

it's an 84 s-10, carburator,could it be the idle set to high or the starter?

Answer 1

I don't think it has to do with the idle being set to high. Since it is starting to be summer, you could probably turn the idle down if you think it is too high. (save some gas). It also wouldn't be the starter, because once you turn off the ignition the starter should be disengaged.
You might want to check your fuel pump.
It is possible that you have blown a seal and gas is mixing with the oil, causing your truck to "cough" after you have shut it off. I wouldn't spend a lot of time and money on this problem. If it runs okay otherwise, just live with it. ( did you leave your vehicle on empty most of the winter?) It could be condensation in your gas tank.

Answer 2

Easiest solution is to shut the truck off in gear rather than park position of the shifter....this will usually stop the problem until you can have it fixed. The condition you have is called run-on or dieseling and can be corrected by adjusting the throttle stop idle speed or the anti-dieseling solenoid if equipped with one. The solenoid may also be bad and need to be replaced.
Basically, the throttle plate is open too far and not allowing the motor to turn off because there is just enough air getting past the plate to allow it to run-on even with the ignition off.
Good luck, Paul

Answer 3

I am assuming that you are talking about "dieseling". That is where you shut off the ignition switch but it continues to "run" for a few seconds anyway. Usually you can press the accelerator and flood it out to get it to stop but it is kind of an embarrassing and annoying thing. Seems alomst like the engine won't just shut off quietly. It's like it is choking and gasping for air to contine to run.

I would look into three possibilities for your problem. I would look into the possibility of carbon build up in your combustion chambers that are a possible cause of your issue theough increase in compression and pieces of carbon that glow red hot and cause detonation. These can be removed by a professional cleaning or if you know how, by adding water through the intake via spray bottle of using an intake vacuum sourse and a piece of narrow tubing to siphon water from a bottle as the engine is running. If you choose to clean it yourself make sure to keep the engine speed up a couple of hundred RPM above Idle, maybe 800-1000 RPM and just suck little bits of water up at a time, you do not want to hydro lock the engine. If you are unsure of what I am talking about don't even try it, take it to a professional or at least consult one before you try this.

Next I would make sure you are using the proper fuel. If your truck is in it'sstock configuration it should be running regualr 87 octane unleaded.

I would also make sure that your ignition timing is set properly. In fact, it might even be time for a tune up. While you are in the make a note of what the spark plugs look like. Is there carbon build up on the plugs? Refer to my first suggestion.

Answer 4

The carbed s-10 has an anti-dieseling solinoid on the throttle linkage, this may be the problem, you didnt say the mileage,but I suspect the timing is off, probably the timing chain or belt is stretched. Check the timing with a timing light.

Answer 5

Not the starter for sure, usually htis is what is called dieseling, clean the fuel system out and run some good gas through it.

Answer 6

It needs a tune-up, very common.

Easy 1 HR under 100.00 most states.

I got a 85 with a 305 . LOL

Answer 7

Check your timing, a tunre -up wouldn't hurt either

Answer 8

this could be bad timing cheap gas vacuum line not on or split open

Answer 9

change oil