Oops

[Adam]

I've been having issues with the way my Pathfinder has been running for a couple of years (it's been parked for a year of that) and today I finally figured out what it was. It all started with replacing 3 of my injectors with some from the junkyard. Obviously this means I had to remove the intake manifold and the fuel rail. When I got it all back together it ran again but had a misfire so I did a standard tuneup, new rotor, wires, spark plugs, etc. None of that fixed it all the way and it always had a poor idle, a misfire, and low on power.

 

So I was getting ready to do the fuel pump and an aftermarket fuel pressure regulator. I reach around the back of the intake manifold and realize the vacuum line is completely missing for the fuel pressure regulator. Vacuum leak plus the fuel pressure not being correct explains a lot. I do still have a slight miss though, going to do the distributor cap Wednesday (ordered a Bosch cap from Amazon) so hopefully that fixes it.

 

Moral of the story, check your vacuum lines thoroughly!