Question about 1991 Ford F150

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5.8L just started will not idle, black smoke

5.8L just started problem is truck will not will not idle, I can make it run, but black smoke, fuel rich at idle and runs rough.

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Possibly a fuel pressure regulator letting too much fuel in the engine

Posted on Oct 03, 2009

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I just bought a 91 5.8L and its not the fuel pressure regulator (just replaced it) its either fuel injectors a clogged Catalytic converter I'm in the process on mine and got it running way better than before when it wouldnt even start. I hope this helps.

Posted on Oct 11, 2009

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1 Answer

Black smoke is coming out from the exhaust it starts right up but the idle is up and down


Black smoke means it's running rich, which could be leaky injector(s), bad coolant temps sensor, poor spark, bad plugs, bad fuel pressure regulator, and many others.

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STARTING PROBLEM, WONT IDLE,BLACK SMOKE, ONCE STARTED IT SOUNDS ROGUTH


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.

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Bad carb or fuel injection issues- the system is fuel rich (black smoke) and also fuel rich system can make the idle low. Many things can cause this but thses are just a few.

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Check the fuel pressure regulator. It may be bad. Pull off the vacuum hose to it and check for any sign of gas in the hose. A busted diaphragm in the regulator could let extra gas into the intake through the vacuum hose. The black smoke indicates it is getting too much gas-running rich.

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Going on the information you have provided it sounds to me like the fuel pressure regulator.It is located unthe intake manifold and is a lenghty job to do and is exspensive to have done.If you have a good mechanical ability it can be done by yourself in about 4-5 hours.and cost about $100 bucks.

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Black smoke means buring rich. Have the vehicle's ECU scanned for codes and do the repair the codes describe. I'm gonna take a stab in the dark and say Mass Air Flow Sensor.(MAF)

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