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2006 F150 5.4L Starting Problems
I have a 2006 F150 5.4L xlt with some starting issues. what happens is the vehicle will not start the first time and will have a drawn out crank time. then when I turn the key on a second time it will start but have sort of growl like it doesn't want too. once running though the truck runs great except I get the codes p1071 and p1074. those codes used to show up either one at a time sometimes they would never show up but not they are both showing up almost instantly after starting the vehicle. now when for in the winter time the vehicle will start no problems at all and hardly any crank time. so basically the vehicle will not start correctly in the summer but will start really good in the cold. and help would be greatly appreciated and I am new to the site and couldn't really find anything with my exact problem. thanks for any help.
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Did you mean p 0171 and p 0174? These are lean codes R&L banks. Sounds like a fuel pressure/delivery issue. Plugged fuel filter, bad fuel pump or a bad injector bleeding down the fuel pressure when you shut it off. This would account for the long cranking on startup.
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Originally Posted by Marc D
(Post 2724051)
Did you mean p 0171 and p 0174? These are lean codes R&L banks. Sounds like a fuel pressure/delivery issue. Plugged fuel filter, bad fuel pump or a bad injector bleeding down the fuel pressure when you shut it off. This would account for the long cranking on startup.
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like any engine they like to be choked when it's cold. An injector that's bad can be flooding fuel instead of the fine mist it's supposed to. Unpluging each one won't tell the real story since it will spray a small amount of fuel all the time if it's bad, power or not. The computer sends a pulse to each injector at the right time and opens it to the fuel in the rail (that is under pressure all the time). The true test of the bad injector(s) is to test the fuel pressure at the rail test port after the motor is off. You may need someone to do this since it takes special equipment. No or low pressure means it's bleeding down through one or more injectors. Fortunately new injectors are only $35 to $40 each (diesel inj. are $300 to $500 each) Try looking on a web site called Parts Train.com
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Originally Posted by Marc D
(Post 2725435)
like any engine they like to be choked when it's cold. An injector that's bad can be flooding fuel instead of the fine mist it's supposed to. Unpluging each one won't tell the real story since it will spray a small amount of fuel all the time if it's bad, power or not. The computer sends a pulse to each injector at the right time and opens it to the fuel in the rail (that is under pressure all the time). The true test of the bad injector(s) is to test the fuel pressure at the rail test port after the motor is off. You may need someone to do this since it takes special equipment. No or low pressure means it's bleeding down through one or more injectors. Fortunately new injectors are only $35 to $40 each (diesel inj. are $300 to $500 each) Try looking on a web site called Parts Train.com
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You can test each one off the truck but it requires removing the fuel rail then separating the injectors one at a time, inspecting for spider cracks around the tip. If there are cracks it's bad.Next using a small bottle of gas with a hose, attach it to the top of the injector, see if it leaks. If it leaks it's bad. Then you can use a battery charger to give it 12 volts and see if it sprays or dribbles. It should spray a very fine mist. If it dribbles it's bad.
I know this sounds like a lot of work but it could save you some money. If your truck has over 150K miles chances are a full set would bet recommended anyway. As for the testing most diesel pump repair shops can do it for you pretty cheaply |
Originally Posted by Marc D
(Post 2727054)
You can test each one off the truck but it requires removing the fuel rail then separating the injectors one at a time, inspecting for spider cracks around the tip. If there are cracks it's bad.Next using a small bottle of gas with a hose, attach it to the top of the injector, see if it leaks. If it leaks it's bad. Then you can use a battery charger to give it 12 volts and see if it sprays or dribbles. It should spray a very fine mist. If it dribbles it's bad.
I know this sounds like a lot of work but it could save you some money. If your truck has over 150K miles chances are a full set would bet recommended anyway. As for the testing most diesel pump repair shops can do it for you pretty cheaply |
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