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94 Bronco, good fuel pressure, spark, wont' start

  #1  
Old 04-18-2018, 01:24 PM
CoastyAV8R
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94 Bronco, good fuel pressure, spark, wont' start

I've floated around the site searching the posts for a scenario like mine but haven't found one. My neighbor gave me a 94 Bronco, 142,000 miles, 5.0, 5 spd that hadn't ran in a few years, it was his sisters who owned it since new and all they said was it quit running.

I put in new plugs, dist cap, rotor, plug wires. Had no fuel pressure but I could hear the pump come on. Fuel in the fuel tank would make a sailor vomit and it was pretty rusty in the tank so I put in a new pump and replaced the fuel tank and fuel filter. Now I have 40 psi on the fuel rail. The Bronco starts when I squirt fuel into the the intake manifold but dies in a few seconds. This tells me I have good spark, I know I have good fuel pressure on the fuel rail so it seems the injectors aren't firing.

I cleaned the ground terminal near the battery and all the connectors at the firewall. I'm picking up a noid tester today to see if the injectors are getting the signal to fire from the ECM. I've read some folks have replaced the PIP, some have found the grounds to be bad, some have replaced the ECM. Am I missing anything else?

Thanks,
Patrick
 
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Old 04-18-2018, 02:00 PM
Redark1
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you might want to pull the injectors out and check the screens in the inlet of each of them. plus flush out the line. make sure you have pulse at the injectors too. scanning for codes might give some clues to help you.
 
  #3  
Old 04-18-2018, 02:45 PM
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Since the engine fires on raw fuel dumped into the intake you are pretty well assured the PIP is good. Since the rest of the fuel system was FUBAR I would suspect the injectors are fouled as stated above.
 
  #4  
Old 04-18-2018, 09:17 PM
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The Bronco's CEL never came on which makes sense because I checked the injectors for the firing signal with a noid test set and they are getting the signal to fire so it looks like I'll be pulling the fuel injectors as recommended. I assume I'll find all sorts of cool stuff in there, will I be able to just clean the inlet screens or should I consider rebuilding them? Any tips to pulling injectors or is the Haynes manual spot on with this procedure?
 
  #5  
Old 04-19-2018, 07:00 AM
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There is a hidden Torx bolt in the center of the upper intake manifold. There is no way to remove the passenger side injectors without removing the upper. Budget for a replacement gasket. There was a write-up for how to clean/rebuild the injectors in the F-Series OBS section of the forum: https://www.ford-trucks.com/forums/1...to-thread.html

Some of the photos are gone and the link to the rebuild kit is dead, but you can see what was in the kit. They can be sourced from most local parts houses.
 
  #6  
Old 04-19-2018, 12:20 PM
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Originally Posted by rla2005 View Post
There is a hidden Torx bolt in the center of the upper intake manifold. There is no way to remove the passenger side injectors without removing the upper. Budget for a replacement gasket. There was a write-up for how to clean/rebuild the injectors in the F-Series OBS section of the forum: https://www.ford-trucks.com/forums/1...to-thread.html

Some of the photos are gone and the link to the rebuild kit is dead, but you can see what was in the kit. They can be sourced from most local parts houses.

Thanks for the insight, I'm sure it'll come in handy. I may just get new injectors as I'd hate to have to do this job twice.
 
  #7  
Old 04-19-2018, 04:45 PM
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that torx is a T40 by the way. I would recommend looking at some explorer 4 nozzle injectors. i believe they were stock on the 97-98 5.0 explorers. they do a better job and worth the work.
 
  #8  
Old 04-19-2018, 06:07 PM
e.lair
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My ‘94 had the same problem. I changed out the fuel pressure regulator and haven’t had a problem since!
 
  #9  
Old 05-05-2018, 08:58 PM
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Well the injectors were definitely toast. I also found a bent push rod when I was putting it back together so I have to find out what caused that. Fun, fun, fun...
 
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