missing when pulling a hill
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Freshman User
Joined: Aug 2006
Posts: 27
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missing when pulling a hill
my 1995 f-150 5.8 auto 4x4 will miss when i pull a hill but will run fine after i crest the hill i have replaced the plugs,wires,fuel filter,cap,rotor and pcv valve i have pulled and cleaned all 8 injectors and put all new gaskets on the upper intake and checked out all the sensors they seem to be good please help this is driving me crazy
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Plug wires arcing between each other, even new ones if they are too close together, and they feed cylinders that are in sequence in the firing order. A dark garage can help see that.
Could also be a lean miss. What condition are the air injection plumbing and exhaust manifolds in? Rusted and or cracked?
Could also be a lean miss. What condition are the air injection plumbing and exhaust manifolds in? Rusted and or cracked?
Mountain Pass
Joined: Aug 2005
Posts: 140
Likes: 1
From: Seattle
This problem sounds a bit like the one below:
https://www.ford-trucks.com/forums/5...nt-fix-it.html
Lean condition cause this problem, and if you heard any pinging going on then that would also be a good indicator. Verify what the fuel pressure is at idle and then pull the vacuum line off the fuel pressure regular, plug the line, and verify that the fuel pressure has gone up. You might try and drive it that way for a short period of time to see if the problem goes away. Idle fuel pressure should be around 30-32 and it should be at 40 with the vaccum line pulled from the fuel pressure regulator.
https://www.ford-trucks.com/forums/5...nt-fix-it.html
Lean condition cause this problem, and if you heard any pinging going on then that would also be a good indicator. Verify what the fuel pressure is at idle and then pull the vacuum line off the fuel pressure regular, plug the line, and verify that the fuel pressure has gone up. You might try and drive it that way for a short period of time to see if the problem goes away. Idle fuel pressure should be around 30-32 and it should be at 40 with the vaccum line pulled from the fuel pressure regulator.
