Ignition problems, no spark
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
Ignition problems, no spark
I have an 86 F250 with a 302 fuel injected engine. It has no spark. I clamped a spare spark plug to the dip stick bracket and put one of the spark plug wires on it to verify this. I verified the fuel pump attached to the frame below the drivers side firewall does run. I removed the computer but haven't removed it from the wiring harness yet. I replaced the coil. Checked the distributor cap and rotor, they are used but not in bad shape.
My questions are:
Does this truck have an electronic module for the distributor?
I can't seem to find it.
What should I do to diagnose the no spark issue?
My questions are:
Does this truck have an electronic module for the distributor?
I can't seem to find it.
What should I do to diagnose the no spark issue?
Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
Thanks for replying. You'll have to bear with me. I'm a GM guy with occasional Ford trucks, after all they are the strongest, toughest trucks built.
Anyway, module on the distributor? It has a cap and rotor, inside looks like an electric sensor for timing. The coil is mounted forward of the driver's side head on a bracket. What module? I'll try to get a pic.
Moderator
Joined: Jan 2001
Posts: 56,992
Likes: 2,741
From: Virginia
Here's a picture. It's called the TFI module.
http://www.therangerstation.com/tech...I_drawing1.gif
http://www.therangerstation.com/tech...I_drawing1.gif
Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
Here's a picture. It's called the TFI module.
http://www.therangerstation.com/tech...I_drawing1.gif
http://www.therangerstation.com/tech...I_drawing1.gif
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
Most parts stores can test it for you. IIRC, there are 2 5.5 mm bolts (7/32" equivilent) holding it to the dist. When you get them out (You might have to loosen the dist and rotate it to get the bolts out) Then wiggle it while pulling down, there are 3 prongs that stick straight up to contact the pickup coil connector and sometimes they get brittle.
Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
I did a search for prices:
Duralast/Control Module - Ignition | Control Module - Ignition | 1986 Ford F250 3/4 ton P/U 2WD 8 Cylinders N 5.0L FI | AutoZone.com
$39
Ignition Control Module by BWD - Part CBE24Z - Advance Auto Parts
$39
Distributor Ignition Control Module by ACDelco - Part F1931 - Advance Auto Parts
$131
Duralast/Control Module - Ignition | Control Module - Ignition | 1986 Ford F250 3/4 ton P/U 2WD 8 Cylinders N 5.0L FI | AutoZone.com
$39
Ignition Control Module by BWD - Part CBE24Z - Advance Auto Parts
$39
Distributor Ignition Control Module by ACDelco - Part F1931 - Advance Auto Parts
$131
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Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
Most parts stores can test it for you. IIRC, there are 2 5.5 mm bolts (7/32" equivilent) holding it to the dist. When you get them out (You might have to loosen the dist and rotate it to get the bolts out) Then wiggle it while pulling down, there are 3 prongs that stick straight up to contact the pickup coil connector and sometimes they get brittle.
Thanks again,
Rich
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Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
New info.
Replaced the TFI module for $41.34. Had to buy a tool that is 7/64 made for removing the TFI module. Had to rotate the distributor to remove the back bolt from the TRI module. After putting the dielectric grease on the back side of the TFI Module, I installed it and reset the distributor to about where it was. Tried to start it and saw a weak spark on my sparkplug that is clamped on the engine for viewing purposes. Plugged in the spark plug wire to it's original plug in the block. The engine seemed to want to run. I squirted some fuel in the intake of the fuel injector air inlet aluminum body and it ran for about 5 seconds. Tried about 5 more times with same results. Now I'm going to dig into the fuel delivery, filter, pumps etc.
Replaced the TFI module for $41.34. Had to buy a tool that is 7/64 made for removing the TFI module. Had to rotate the distributor to remove the back bolt from the TRI module. After putting the dielectric grease on the back side of the TFI Module, I installed it and reset the distributor to about where it was. Tried to start it and saw a weak spark on my sparkplug that is clamped on the engine for viewing purposes. Plugged in the spark plug wire to it's original plug in the block. The engine seemed to want to run. I squirted some fuel in the intake of the fuel injector air inlet aluminum body and it ran for about 5 seconds. Tried about 5 more times with same results. Now I'm going to dig into the fuel delivery, filter, pumps etc.
Moderator
Joined: Jan 2001
Posts: 56,992
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From: Virginia
Pull the codes. If the computer doesn't see a signal from the module, it won't turn the pumps on. Maybe a wire is broken or loose to the module. The computer has a error code it spits out when it doesn't see a signal from the module.
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Elder User
Joined: Jul 2007
Posts: 842
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From: Salem, CT
I don't know how to get the codes. It's a 1986 F250.
Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
Going to try to get codes today. Thanks for the info
Ford Fuel Injection How To Run a Self-Test
Ford Fuel Injection How To Run a Self-Test
Thread Starter
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Elder User
Joined: Jul 2007
Posts: 842
Likes: 1
From: Salem, CT
I heard some relays engage and the fuel pumps prime the system.
I did catch a brief flickering of the light.
This is what I think I have:
KOER 31 PFE or EVP circuit below minimum voltage of 0.24 volts.
The thing that bothers me is the above code was presented twice.
Although I did get the 6 second pause and the single separator blink and another 6 second pause.
CM 14 Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall.
CM 18 IDM circuit failure or SPOUT circuit grounded.
CM 15 EEC battery powered Keep Alive Memory (KAM) test failed.
CM 19 Cylinder Identification CID circuit failure.
So, what does all this mean???
I did catch a brief flickering of the light.
This is what I think I have:
KOER 31 PFE or EVP circuit below minimum voltage of 0.24 volts.
The thing that bothers me is the above code was presented twice.
Although I did get the 6 second pause and the single separator blink and another 6 second pause.
CM 14 Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall.
CM 18 IDM circuit failure or SPOUT circuit grounded.
CM 15 EEC battery powered Keep Alive Memory (KAM) test failed.
CM 19 Cylinder Identification CID circuit failure.
So, what does all this mean???