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John Mc
John Mc, Ford Technician
Category: Ford
Satisfied Customers: 6238
Experience:  19 years Ford Lincoln Mercury experience
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i have a 1987 ford f150 inline 6 cylinder 4 speed and it will

Resolved Question:

i have a 1987 ford f150 inline 6 cylinder 4 speed and it will crank but will not start, can you help me figure this out thank you.

Dawn Rivard
Submitted: 4 years ago.
Category: Ford
Expert:  John Mc replied 4 years ago.

Hello, I am John, a Ford dealer technician.

I hope I can help solve your problem quickly and accurately.

 

This truck is in one of the transition years of carb or fuel injection. Do you know which it is? Let me know and I'll do my best to help you.

 

Thanks,

John Mc

Customer: replied 4 years ago.

it is an efi

Expert:  John Mc replied 4 years ago.

Ok, with the key on and engine off I want you to see if you have power at your iac valve. This is on top of the intake right behind the throttle body. The easiest way to check this is with a test light. Let me know what you find.

 

Thanks,

John Mc

Customer: replied 4 years ago.
i have voltage and it's about 5 volts
Expert:  John Mc replied 4 years ago.

It should have 12 volts. If you are unsure of what the iac valve looks like here is a pic.

 

graphic

 

If this is the part and you still do not have 12 volts you will first need to check your battery to see if it is low. If so charge or replace it. If not chances are you have a bad eec power relay. This should be on the drivers side fender or firewall and is brown in color. If you think this could be bad replace it. If this is not the case let me know and we'll go from there.

 

If you have any more questions please feel free to ask, it's what I'm here for!

-

important to me so please leave accurate feedback for others to see my job performance.

-

Thank you,

John Mc

JustAnswer Expert

Customer: replied 4 years ago.
can i get back with you tomorrow on this also if possible
Expert:  John Mc replied 4 years ago.

Yes no problem. I will be at work but I keep up on the website also. It may take at the most an hour for me to get back to you but I will.

 

Thanks,

John Mc

Customer: replied 4 years ago.

i have 12 volts to that part

 

Expert:  John Mc replied 4 years ago.

Does your truck have a check engine light? I'm sorry but this truck is an early model efi truck and all the things we have now weren't standard then. This is why I'm asking all these questions.

 

 

Customer: replied 4 years ago.
no problem no i do not have a check engine light on my truck? i don't mind ask any question you want.
Expert:  John Mc replied 4 years ago.
Ok, with the key on and engine off does the fuel pump run constantly?
Customer: replied 4 years ago.
no it does not. it actually shuts off a few seconds
Expert:  John Mc replied 4 years ago.

Ok this shows that your pcm is powering up and priming your fuel pump. The next check has to be done with a test light. Take the connector loose for the ignition coil. The wire plug not the spark plug wire. Now with the key on and engine off connect the clip to ground and see if the red/green wire has power. After that connect the clip to the positive side of the battery. Now check if the other wire flashes the test light when you crank the engine.

 

Let me know the results.

Customer: replied 4 years ago.
yes it does
Expert:  John Mc replied 4 years ago.
So it has power one way and flashes the other?
Customer: replied 4 years ago.
yes
Expert:  John Mc replied 4 years ago.

Ok, a few more checks and I think we will have the problem narrowed down. Now I need you to pull one of the fuel injector connectors and check it the same way you checked the coil. Look for power on one side and look for ground pulse on the other side. If this is ok I want you to test for spark at one of the spark plugs. Remove the plug and insert into the wire. Lay the plug on the block somewhere so it will get a ground and check if you have spark while cranking. If this is ok then you have spark and injector pulse. The only other options will be if you have a good fuel supply and good compression. Try fuel supply first. You will need a fuel pressure guage to check this. You should have a minimum of 30 psi. If this is low you will need to look at a possible bad fuel pump or restricted filter... or no gas in the tank. If this is ok do a compression test. You should have at least 100 psi on all cylinders with a good battery and the gas pedal at wide open. If low it is possible you have bad timing gears. To verify this get the number one cylinder on top dead center. Remove the cap and see if it points at the number one terminal on the cap, if not rotate the engine one full turn and put it on tdc again. If it still does not line up with number one then you have bad timing gears.

 

If you have any more questions please feel free to ask, it's what I'm here for!

-

important to me so please leave accurate feedback for others to see my job performance.

-

Thank you,

John Mc

JustAnswer Expert

Customer: replied 4 years ago.
fuel pressure test new fuel pump rated at 90 lbs on the fuel rail should i have 30 or 90 lbs? can not get pressure gague til tomorrow how can i reach you?
Expert:  John Mc replied 4 years ago.

We are just looking for a minimum. I believe these engines run 50 psi. All you need for a basic start is 30. We are just making sure it is pumping.

 

You can reach me by posting right here.

 

If you have any more questions please feel free to ask, it's what I'm here for!

-

important to me so please leave accurate feedback for others to see my job performance.

-

Thank you,

John Mc

JustAnswer Expert

John Mc, Ford Technician
Category: Ford
Satisfied Customers: 6238
Experience: 19 years Ford Lincoln Mercury experience
John Mc and 4 other Ford Specialists are ready to help you
Customer: replied 4 years ago.

okay thank you i will get back with you tomorrow evening when i get the tester to check it.

 

dawn

rivard

Expert:  John Mc replied 4 years ago.
Ok, thanks.

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