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Bamaman39
Bamaman39, Ford Technician
Category: Ford
Satisfied Customers: 2242
Experience:  10 years ford experience, Ford Senior Master Diesel And Gasoline Tech
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1997 ford explorer: the injectors the fuel filter..leaks..maf sensor

Resolved Question:

my 1997 ford exploer has po171 po174 po301 po304 i have replaced the injectors the fuel filter checked for vaccum leaks did not find any checked the maf sensor readings with a multi meter it seams to be fine but still havent fixed the problem any ideas to fix it would help
Submitted: 4 years ago.
Category: Ford
Expert:  Bamaman39 replied 4 years ago.

Thank you for using just answer.

 

Is the truck running rough?

 

Customer: replied 4 years ago.
yes
Expert:  Bamaman39 replied 4 years ago.
99% of the time when you have lean codes for both sides and cylinder codes 1 and 4 you have a bad fuel pump.1 an 4 are the last to receive fuel and the lean codes show that the fuel trims are very low.You can do a fuel test if you want to but i really think you need a pump.

Edited by Bamaman39 on 11/28/2009 at 8:45 PM EST
Customer: replied 4 years ago.
is it just not supplying enough pressure or may it be clogged
Expert:  Bamaman39 replied 4 years ago.
The fuel pump should send 30 or more psi of fuel to the motor.When the pumps gets weak or goes bad it will send only around 8 to 10.If there was any clog it would have changed when you replace the fuel filter as this is the first thing to restrict fuel.
Bamaman39, Ford Technician
Category: Ford
Satisfied Customers: 2242
Experience: 10 years ford experience, Ford Senior Master Diesel And Gasoline Tech
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