Need advice asap please!
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Joined: Sep 2017
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Need advice asap please!
I have an 86 f150 302 5.0 V8 2WD automatic. The other day I was driving down the interstate and my truck started to feel like I was running out of gas (I had at least a quarter of a tank for sure) and I pressed harder on the accelerator and got a "jump" of acceleration then let off the gas pedal and when I pressed the pedal in again to just drive normally I had zero acceleration at all and actually decelerating pretty quickly. I then pulled over (truck is still running) and turned the truck off, I waited a minute or two and tried to start it again but it wouldn't start. When I turned the ignition it tried to start but never actually got there. VDOT came behind and I tried again but nothing, they said it sounded like all my spark plugs were firing but no clue as to why it wouldn't start. The starter has been replaced within the year and also figured that if my starter was bad that it wouldn't make the attempt to start. This is my only vehicle so please help!!
Junior User
Joined: Apr 2017
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From: NE TN
I have an 86 f150 302 5.0 V8 2WD automatic. The other day I was driving down the interstate and my truck started to feel like I was running out of gas (I had at least a quarter of a tank for sure) and I pressed harder on the accelerator and got a "jump" of acceleration then let off the gas pedal and when I pressed the pedal in again to just drive normally I had zero acceleration at all and actually decelerating pretty quickly. I then pulled over (truck is still running) and turned the truck off, I waited a minute or two and tried to start it again but it wouldn't start. When I turned the ignition it tried to start but never actually got there. VDOT came behind and I tried again but nothing, they said it sounded like all my spark plugs were firing but no clue as to why it wouldn't start. The starter has been replaced within the year and also figured that if my starter was bad that it wouldn't make the attempt to start. This is my only vehicle so please help!!
If it cranks then starter should be good.
Not sure how VDOT can listen to it cranking and tell you that the spark plugs are firing.
I would start with simple stuff first. The Trinity!
Fuel, Fire, Compression
Check to make sure you are getting fuel. Clogged fuel filter might cause this. Is pump working?
After that check that you are actually getting spark and that timing is correct.
If all that checks out make sure you are getting good compression. Parts store should sell a compression tester.
Now I'm not familiar with your truck so maybe someone who is can chime in on specifics or other thoughts.
Fleet Mechanic
Joined: Mar 2014
Posts: 1,926
Likes: 116
From: Saskatchewan Canada
EFI equipped? Test your fuel pressure. Sounds like a failing pump. Keep in mind there are two fuel pumps. The high pressure pump on the frame rail is pretty reliable. Usually the lift pump ion the tank fails.
More Turbo
Joined: Mar 2008
Posts: 525
Likes: 6
From: douglasville
+1 on the control module, even if it's getting spark the control module could still be bad and not sending out the signal for the injectors to fire, seen this happen many times over the years. Also could be a bad ground to the ecm these early EEC-IV have a dedicated ground wire directly from the battery to the ecm that is prone to break or come loose then the ecm ceases to operate
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Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
All those guys are correct, it could be a lot of things; diagnose it to find the actual problem.
But you need to clarify, EFI or carburetor.
But you need to clarify, EFI or carburetor.
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Cargo Master
Joined: Jun 2013
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From: Somewhere n North America
How are you doing with this ?
86' F-150, 5.0L, Stock, would be EFI.
As already stated, check your fuel pressure via the valve on your fuel rail.
A quick test is to give your intake a shot of starting fluid, to see if it fires up.
Single or Dual Tanks?
86' F-150, 5.0L, Stock, would be EFI.
As already stated, check your fuel pressure via the valve on your fuel rail.
A quick test is to give your intake a shot of starting fluid, to see if it fires up.
Single or Dual Tanks?
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