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When first started, it runs rough if you step in the gas. It almost floods itself out. You can really smell the gas! Once warmed up in about 5 minutes it run fine.
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This problem is a bit more difficult to diagnose because half of your symptoms rule out half of the solutions. I would think the ISC control could be dirty or not working or your fuel injectors are sticking open.
With black exhaust smoke you are running rich. Often the "Cold start sequence" is at fault for poor starts making the engine too lean when the sequence fails. An intake air leak can cause the engine to run Rich, causing the black smoke, rough idle, rough running conditions. This is still a possibility, but the on-board computer usually sets a Code saying you are running "Lean" and then enriches the fuel ratio and floods the engine by itself.
Now the fuel injectors can cause several of your problems. For start-up problems, the remaining fuel pressure can dump fuel into the engine as the car sits because the injectors are sticking open. Someone would need to perform a fuel pressure bleed-down test to see if you have this problem.
Another way to verify this problem is to capture the oil during an oil change and smell it for gasoline fumes. The dilution of the oil will destroy the engine. If the injectors are found to be the problem, a new oil filter and change are needed.
you need to adjust your idle screw on your carb i could tell ya how on that type of car but your running to high of an idle and flooding your cylinders thats y it is idleing rough and you can smell the gas, adjust your idle screw back a little and then you might want to check your plugs and make sure you didnt fowl and of them with it running rich
For the RPM's jumping up and down i would replace the throttle position sensor. If it smells like bad gas or rotten eggs these are signs that the cat. converter is going bad. For the poor gas mileage replace the fuel filter.
Check the fuel/air sensor and air filter. When you first start the car only press the accelerator pedal once. If while turning the ignition switch you here a grinding noise that would be your starter going out. The smell of fuel signals that your car is either flooded from pressing pedal or fuel mixture is incorrect. Hope this helps.
1. Could be changing the fuel filter
2. Leaking injector
3. The gas cap (tank gas input) is clogged - Gas tank does need some air
4. Pressure check you gas line - should be in the 20s and hold steady for hours. Could be slow leak
maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?
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