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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

1986 f150 302 problems

 
  #46  
Old 04-09-2019, 02:02 PM
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Originally Posted by vjsimone View Post
The sensors, TPS, ACT,ECT, MAP, EVP, Knock Sensors use a 5vdc Reference.
Injectors, solenoids, relays, TFI module use 12 volt Ref.
Did you measure for the 5v ?
 
  #47  
Old 04-09-2019, 02:06 PM
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Originally Posted by Fordfarmer79 View Post
Pulled codes, the only one that popped up that wasn't from me unplugging sensors is tps voltage too low, and no power to pins 37+57 which also stated it could be a bad pcm... Will check for power and go from there.
Engines are easier to diagnose over the internet when all the codes are listed, and in order of test.
KOEO - (O) Self-Test Codes = ?
KOEO - (C)(CM) Continuous Memory Codes = ?
KOER - (R) Self-Test Codes = ?

Do you have any Non-Stock modifications?
(Air Intake? Smog System? Exhaust System? Ignition System?)

 
  #48  
Old 04-12-2019, 04:04 PM
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Truck is all stock. We tried a computer from an 87, it acts like it's trying to catch up with firing, but still no start. I will try to get codes. All codes are tps high voltage, ECT high voltage, and no one's listed.
 
  #49  
Old 04-12-2019, 05:52 PM
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Originally Posted by vjsimone View Post
I took a look at this and believe your Merc is SFI, so this will not work for a test.
Like the merc, a few cars went straight from CFI to SFI and never saw MFI like your truck......
My car has the same injector set up as the truck. Just a different throttle body is all I can tell. Has two oxygen sensor though...
 
  #50  
Old 04-12-2019, 07:17 PM
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Originally Posted by Fordfarmer79 View Post
My car has the same injector set up as the truck. Just a different throttle body is all I can tell. Has two oxygen sensor though...
He is saying the car is probably a sequential fire setup, while the truck is batch fired. Sequential fired engines have a separate different colored wire to each injector, with the common 12v colored wire on the other side of each injector. The truck is batch fired, one bank of injectors will be fed with a common colored wire, and the other bank will have another common colored wire feeding all 4 injectors. And then they will all have the common 12v colored wire like the car does.
 
  #51  
Old 04-12-2019, 07:19 PM
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Ahhh, I see, thank you for clarifying.
 
  #52  
Old 04-12-2019, 09:40 PM
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Originally Posted by Fordfarmer79 View Post
We tried a computer from an 87, it acts like it's trying to catch up with firing, but still no start. I will try to get codes. All codes are tps high voltage, ECT high voltage, and no one's listed.
What did the 87 computer come from? What engine?
 
  #53  
Old 04-12-2019, 11:41 PM
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Originally Posted by vjsimone View Post
What did the 87 computer come from? What engine?
A 302 with an aod also. I guess I never pulled codes with the new computer hooked up...
 
  #54  
Old 04-13-2019, 06:01 AM
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Originally Posted by Fordfarmer79 View Post
A 302 with an aod also. I guess I never pulled codes with the new computer hooked up...
What model vehicle did it come from ?
 
  #55  
Old 04-17-2019, 09:00 PM
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Well, I think it has to be the computer.. has power to the computer, has good ground, and good wiring from the injectors to the computer. Pulled the computer down, and it smells like hot plastic, and the fuel pump will not **** off now if engine is not running. Will pop off with ether, but not get going.
 
  #56  
Old 04-17-2019, 10:16 PM
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Originally Posted by vjsimone View Post
What model vehicle did it come from ?
Sorry didn't see this post, an 87 f150 4x4.
 
  #57  
Old 04-18-2019, 06:45 AM
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Originally Posted by Fordfarmer79 View Post
Well, I think it has to be the computer.. the fuel pump will not **** off now if engine is not running. .

Yeah, a continuous running fuel pump when the engine is not running is a sign of a faulty ECA/computer.

If the 87 ECA was out of a 5.0L it should have worked, if not faulty itself.
 
  #58  
Old 04-18-2019, 08:46 AM
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Originally Posted by vjsimone View Post
Yeah, a continuous running fuel pump when the engine is not running is a sign of a faulty ECA/computer.

If the 87 ECA was out of a 5.0L it should have worked, if not faulty itself.
Strange, because it did come right out of his truck. Now upon further inspection, it comes back to a Ford 3.0L engine.... Strange... I think I'm going to order a rebuilt one from Rock Auto.
 
  #59  
Old 04-20-2019, 11:19 AM
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I'm going to assume the distributor module tells the ecm that the engine is spinning?
 
  #60  
Old 04-20-2019, 03:05 PM
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Originally Posted by Fordfarmer79 View Post
I'm going to assume the distributor module tells the ecm that the engine is spinning?
Yes, the Hall-Effect device reacts to the turning of the vane in the Distributor, that signal is applied to the TFI module mounted to the Distributor and the TFI module sends the signal to the ECA/Computer.


 

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