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97 ford ranger: diagnostic..it the fuel injector pressure regulator…

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diagnostic trouble codes po171 an...
diagnostic trouble codes po171 an po174 on my 97 ford ranger what is it an how can I fix it. Is it the fuel injector pressure regulator? thanks vinny
Submitted: 8 years ago.Category: Ford
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Answered in 11 minutes by:
6/29/2010
Ford Mechanic: Eric, Automotive Repair Shop Manager replied 8 years ago
Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 35,168
Experience: Automotive Repair Shop Manager, Technician
Verified

Hi,

 

The most common reasons are vacuum leak, intake air leak, dirty mass airflow sensor, and then fuel delivery issue

 

You will need a spray bottle filled with water. With engine idling, spray each of the vacuum hoses one at a time. If idle changes when one is sprayed, replace it as it is leaking. If ok, then do same thing spraying the base of the intake manifold with the water. if idle changes, replace intake manifold gasket.

 

If ok, remove the maf sensor and use some automotive electronics parts cleaner to clean the maf sensor.

 

If ok, then fuel pressure will need to be checked with fuel pressure gauge to determine if low fuel pressure or faulty pressure regulator

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Ford Mechanic: Eric, Automotive Repair Shop Manager replied 8 years ago

The most common reasons are vacuum leak, intake air leak, dirty mass airflow sensor, and then fuel delivery issue

 

You will need a spray bottle filled with water. With engine idling, spray each of the vacuum hoses one at a time. If idle changes when one is sprayed, replace it as it is leaking. If ok, then do same thing spraying the base of the intake manifold with the water. if idle changes, replace intake manifold gasket.

 

If ok, remove the maf sensor and use some automotive electronics parts cleaner to clean the maf sensor.

 

If ok, then fuel pressure will need to be checked with fuel pressure gauge to determine if low fuel pressure or faulty pressure regulator

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