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Working on a 91 Ford Ranger and I don't have spark I have…

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Working on a 91...

Working on a 91 Ford Ranger and I don't have spark I have tested everything and replace every thing could it be the computor

Mechanic's Assistant: Are you fixing your Ranger yourself? What have you tried so far?

Yes and replaced all that is required for spark but the comnputor

Submitted: 10 months ago.Category: Ford
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Answered in 1 minute by:
9/28/2017
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Ford
Satisfied Customers: 2,319
Experience: Automotive Instructor at Palm Beach State College
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Hi my name is***** will be able to help you with your no spark. What engine size do you have?
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Customer reply replied 10 months ago
2.3 double spark plugs
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

What have you replaced so far to try and get spark?

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Customer reply replied 10 months ago
no thanks just want to know if the computor has gone bad i have replaced every thing but that
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

I need to know what you have replaced and if the computer has been scanned for codes?

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Customer reply replied 10 months ago
everything that has to do with spark and yes i have checked for codes and get differnet codes each time
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

I need to know what you have installed to do with spark and what codes you get when scanned?

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Customer reply replied 10 months ago
ICM coil packs crank sensor plugs and wires and getting the correct power to all but not getting spark something is not telling the coils to fire what codes do i need to look for
Customer reply replied 10 months ago
it has ob 1 system
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

Check to see if you get power to red wire at coils with key on and also power when you go to crank position? You can also check the same red wire at the injectors.

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Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

If you get codes to throttle position sensor then try to disconnect sensor and see if it gets spark?

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Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

It would help a lot if you give me the codes you get?

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Customer reply replied 10 months ago
it doesn't have injectors it is a 91 and is injected though the carb if that sounds right
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

Are you saying you do not have 4 fuel injectors mounted in the intake manifold near cylinder head? They stopped using carburetors in the 1980's.

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Customer reply replied 10 months ago
i will get back to you
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

I am opting out so another expert can help you. My information does not show a throttle body injection or carburetor for the truck year and engine size.

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Customer reply replied 10 months ago
ok i'm back I get 11 witch is system pass and a 122 witch is low voltage and unpluged it still no spark
Customer reply replied 10 months ago
voltage is 4.97
Ford Mechanic: Jaybird61, ASE Certified Master Technician replied 10 months ago

If you only get 4.7 volts at the connector then you either have a low battery or the computer relay is not getting or sending enough voltage to coils. It will not start with less than 9 volts.

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