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1995 f150 start up issues

 
Old 03-13-2019, 11:46 PM
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Default 1995 f150 start up issues

I have a 1995 F150 with the 5.0 L manual trans. Motor is stock other than cold air intake and throttle body spacer. I have seemingly random start up issues. She will crank but wonít fire sometimes. If she sits for long periods 4 or more hours she always fires. If I drive around then park and come back to her she will crank all day, will not fire. Originally thought it was a fuel issue because I would bleed fuel rail and get her to start. That trick doesnít seem to be working so now Iím thinking itís a spark issue. I have replaced the fuel pressure regulator but that didnít do anything. Any help would be very nice, this is getting annoying!
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Old 03-14-2019, 05:53 AM
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Check for stored codes.
Hang a fuel pressure gauge to determine fuel pressure.
Check for spark.

More fuel pressure regulators get replaced as a guess when in fact they prevent the pressure from going too high.I would pull its vacuum line and look for the presence of raw fuel.
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Old 03-14-2019, 09:51 AM
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When it does not fire up - i.e. when it cranks all day but not start - check for spark at the coil. If it has spark, I'd bet it is something like the engine coolant temp sensor. If it does not have spark, my bet would be PIP sensor in the distributor or the ignition control module.

But yes, pull codes and measure fuel pressure at the rail on both tanks - this is the first step. Most places don't accept returns on electrical parts so throwing money at it can get expensive.
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Old 03-14-2019, 01:39 PM
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Thanks for the advice, I will try these and report back.
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Old 03-14-2019, 11:05 PM
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Originally Posted by BigBlue1124 View Post
Motor is stock other than cold air intake...
CAI has been stock on virtually every passenger vehicle since 1975. What did you put on it?
Originally Posted by BigBlue1124 View Post
...and throttle body spacer.
Dead weight.
Originally Posted by BigBlue1124 View Post
She will crank but won’t fire sometimes. If she sits for long periods 4 or more hours she always fires.
Get a Haynes manual & a digital multimeter (DMM), and start testing every sensor. Click these & read the captions.


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Originally Posted by BigBlue1124 View Post
That trick doesn’t seem to be working so now I’m thinking it’s a spark issue.
Both are blind guesses, and if dumping flammable liquid onto a warm engine ever helped, it's blind luck you're not dead and just a coincidence that the engine ran afterward. Stop guessing & start diagnosing.
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