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1994 ford ranger 2.3l manual engine has 40 psi on the rail…

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1994 ford ranger 2.3l manual...
1994 ford ranger 2.3l manual engine has 40 psi on the rail when key on
I have replaced the fuel pump modual fuel filter, gas , clean injectors, starts right up then slows and dies cannot add accelerator or it wil die,runs rough at idle. But when I disconnect the air intake hose from the air filter it runs perfect, I took top of air filter housing all looks good , when truck is running , I go and put air hose on filter housing top and I dies, and it's not even mounted to the lower half of the housing , grey motor craft box on air filter housing , I don't know what it is or does , but my problem might be there. Please help
Submitted: 2 years ago.Category: Ford
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Customer reply replied 2 years ago
On another note I can completely over the air horn at the manifold and truck stays running , telling me the idle air sevo is working! Ok I'll buy a mass air flow sensor
Ford Mechanic: cloe0626, Auto Mechanic replied 2 years ago

you need anything else let me know please be sure to rate my service when you get the chance

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Customer reply replied 2 years ago
I replaced the mass air flw sensor, and no change does the same thing starts and then dies, I have replaced the pump,filter,and cleaned the injectors, has 40 psi on the rail replaced mass air flow sensor,has good spark on all 8 only runs when you remove the air horn hose and keep it from sucking from the MAFS.
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 23,877
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

The first step in diagnosing the problem accurately is to check for fault codes.

Do you know if any codes are setting?

Are you able to monitor data?

Does the exhaust smell as if it's running rich or lean?

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Customer reply replied 2 years ago
No codes , cannot, monitor
Customer reply replied 2 years ago
Exaust is prob lean
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

How did you determine no codes are setting?

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Customer reply replied 2 years ago
No check engine light
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

You didn't actually check for codes then, correct?

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Customer reply replied 2 years ago
Koeo code 111 is what I get obd1.
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

You mentioned covering something and the truck stayed running. Was it the throttle body you covered?

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Customer reply replied 2 years ago
I took off the air hose to air cleaner from the manifold truck runs , I can completely cover the air intake at the manifold and it still runs ,hook the hose up to the MAFS and it dies
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

If you can cover the throttle body and the engine doesn't die then you have a vacuum leak, it's running on air that isn't coming through the throttle body.

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Customer reply replied 2 years ago
Is it not going through the idle air servo?
Customer reply replied 2 years ago
Has mass suction cannot hear a vac leak I thought that it was sucking the air through the servo?
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

All air entering the engine comes through the throttle body including the IAC's supply. If you cover the throttle body and the engine still runs then you have a vacuum leak.

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Customer reply replied 2 years ago
Ok , so if I cover the air intake at the throttle body with my hand the engine will still run but if I also plug the PVC hose also it will die and I hear no vac leaks.
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

I'm a full time tech and at work this afternoon, I'll get back to you as quickly as I can!

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Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Is your oil cap or the PCV makeup air hose to the valve cover off?

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Customer reply replied 2 years ago
Do you have face time ?
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

I do not.

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Customer reply replied 2 years ago
There is a Motorola dis box bolted to manifold injector harness goes through it,not sure what it does .im lost don't know what it could be ?
Ford Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

If you can upload a picture of what you're questioning I can hopefully identify it.

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Satisfied Customers: 23,877
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