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2004 5.4- Black smoke, stalling, hard to start

2004 - 2008 F-150

2004 5.4- Black smoke, stalling, hard to start

 
  #16  
Old 04-26-2019, 07:44 AM
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Originally Posted by MeanGene View Post
Thinking about this more. How does the air filter look is it all in one piece?
Yeah, the air filter is practically brand new and in great shape.

I don't think vacuum line contamination is the problem anymore, I think that was just sort of a coincidental thing.

I do have what sounds like an exhaust manifold leak, maybe that's related. Yesterday I couldn't even get the truck started.
 
  #17  
Old 04-26-2019, 10:21 AM
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Your cats may be plugged.
 
  #18  
Old 04-26-2019, 11:41 AM
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If it's not pouring rain when I get home today I'll try loosening the bolts to the cat and see if anything changes.
 
  #19  
Old 04-27-2019, 01:01 PM
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Can't get the cats loose even with an impact. O2 sensors won't budge either.

Still can't get it started and I'm not even getting any codes now. It just cranks. Fuel rail pressure is perfect. New injectors, new fuel filter, new FPDM, pump working, all evap components working. I'm lost.

Never had so much trouble figuring out a vehicle problem. I'm ready to get it towed to a shop for the third time. Hopefully someone is able to figure out this POS cause I'm sick of looking at it.
 
  #20  
Old 04-27-2019, 06:34 PM
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I've found 50/50 getting exhaust stuff apart without using heat... you'll need at least a MAPP gas torch.

Sometimes starting the engine, and letting it warm up can sometimes yields 50/50 results on the o2 sensors. I just cut the wire off, get a torch, heat'em, then use my breaker with suitable size deep well socket and yank'em out... in the garbage they go.
 
  #21  
Old 04-27-2019, 09:34 PM
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What has been done recently. Any work to AC?
 
  #22  
Old 04-28-2019, 11:43 AM
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Originally Posted by MeanGene View Post
What has been done recently. Any work to AC?
Nothing. The truck was running perfectly and then just died on the highway one day. Then it was "fixed" with a new fuel pressure sensor and died again two weeks later with the exact same symptoms.
 
  #23  
Old 05-08-2019, 12:01 PM
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Had it towed back to the shop a week ago. They still can't figure out what's wrong with it.
 
 


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