-Here next step to work on:
-Check for fuel pressure. If not within specification then the pump is not function the way it should.
-Check fuel pressure regulator. It hold pressure or not. It not then the pressure regulator need to be replace.
Good luck
Mai
SOURCE: 2002 kia sedona 3.5l has rough idle replaced plugs wires and coil
this vehicle has coil packs for the ignition correct? have you ran the engine at night with all surrounding lights outs so its really dark. spray a mist of water on the coil packs and spark plug wires to see if you have spark/voltage leaks jumping out from them. sometimes the tiny sparks will be so fine and skinny you can barely see them so it needs to be dark. hope this helps your trouble shooting. a coil pack could have such a fine crack for the voltage to leak from that you cant see it.
SOURCE: Have a 2004 kia sedona
Hi
Have you tested your CKP (crankshaft position sensor and your CMP (camshaft position sensor)
Both of these sensors can cause a miss fire.
Also have you tried to swap coils and see if the miss fire follows the coil.
Also have you compression tested that cylinder?
poor compression will cause a miss fire in just cylinder.
Hope this helps write back and tell me how your making out.
FixYa
SOURCE: I HAVE A 2005 KIA RIO THE CHECK ENGINE LIGHT CAME
Take it to another shop and have them do a compression check. If the compression is low, you have found the problem. If the compression is the same as the other cylinders, trade the fuel injector at that cylinder with another cylinder and see if the problem moves. If the problem moves (misfire code in different hole), the injector is bad. If the problem didn't move, and the compression is fine, then you have a vacuum leak on the intake runner to that cylinder, possibly the intake gasket. Print this and give it to your new mechanic.
SOURCE: 2002 saturn vue cylinder 1,3,5 misfiring when swapped coil pack it went away now cyl 2,6 misfiring.
having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,
Testimonial: "I have been having this problem for a few months now and I have tried everything except install a new Cat. I had a feeling but wasn't sure until this guy mentioned it. He really knows his stuff. He pin pointed everything to a "T". You're a really good mechanic, my friend. Keep up the good work. Thank you so much. Your knowledge is highly recommended."
218 views
Usually answered in minutes!
×