Ranger 3.0 fuel pressure problem. Need help please.
#16
06-16-2013, 12:08 AM
OK, good feedback on the injector KOER under load operating voltage, so we know its under load feed voltage isn't dropping. You could have more than one problem that's confusing things!!!!
Since you have a scantool that'll read live PID's, yes it might be able to shed some light on whats going on with #3 cyl & since you don't have any other code clues, stay focused on the #3 cyl misfire code & post the code # you have.
Maybe post up the short & long term fuel trim numbers & O2 sensor switching voltage & range, for both cyl banks & maybe that could begin to shed some light on if you have leaky fuel injectors that's messing with the fuel pressure question & maybe playing a part in the cyl #3 misfire code.
BTW, have you tried disconnecting the new injectors electrical connector, to see if it affects idle speed????
Have you done a compression check on #3 cyl, or done a cyl balance test with your scantool, to see if it'll flag #3 cyl????
Since we have a "waste spark" ignition, cyl #3 does share the other end of the same secondary ignition pack coil as cyl 4, so maybe #4 secondary is playing some role in the mischief that's going on with #3 cyl, but right now without some clues, just keep those thoughts in mind while you complete your trouble shoot.
As you could have more than one problem, other things could be confusing things, but you do have a misfire code for #3 cyl & a KOEO fuel pressure drop that remains unexplained after the fuel pump replacement.
A misfire can be caused by a number of things, so lets think about this some more, before you give up & take it to the Dealer & pay them Big Bucks to have them redo what you've already done & the remaining trouble shooting things you can do, to try & narrow down whats going on.
To try & narrow down whats going on with the KOEO fuel pressure, you could disconnect the line to the fuel rail & connect your pressure gauge to it in a dead end fitting, so your just monitoring pump & line pressure to the fuel rail & that would test the new pumps check valve. Just because the pump is new, doesn't automatically make it good, make that puppy prove itself.
Then things like CCDI could be messing with you on #3 cyl, or other injectors weeping some on the fuel pressure drop, so still some testing to do without trouble code clues to help steer the trouble shoot.
A bunch more thoughts for consideration, let us know how it goes.
Since you have a scantool that'll read live PID's, yes it might be able to shed some light on whats going on with #3 cyl & since you don't have any other code clues, stay focused on the #3 cyl misfire code & post the code # you have.
Maybe post up the short & long term fuel trim numbers & O2 sensor switching voltage & range, for both cyl banks & maybe that could begin to shed some light on if you have leaky fuel injectors that's messing with the fuel pressure question & maybe playing a part in the cyl #3 misfire code.
BTW, have you tried disconnecting the new injectors electrical connector, to see if it affects idle speed????
Have you done a compression check on #3 cyl, or done a cyl balance test with your scantool, to see if it'll flag #3 cyl????
Since we have a "waste spark" ignition, cyl #3 does share the other end of the same secondary ignition pack coil as cyl 4, so maybe #4 secondary is playing some role in the mischief that's going on with #3 cyl, but right now without some clues, just keep those thoughts in mind while you complete your trouble shoot.
As you could have more than one problem, other things could be confusing things, but you do have a misfire code for #3 cyl & a KOEO fuel pressure drop that remains unexplained after the fuel pump replacement.
A misfire can be caused by a number of things, so lets think about this some more, before you give up & take it to the Dealer & pay them Big Bucks to have them redo what you've already done & the remaining trouble shooting things you can do, to try & narrow down whats going on.
To try & narrow down whats going on with the KOEO fuel pressure, you could disconnect the line to the fuel rail & connect your pressure gauge to it in a dead end fitting, so your just monitoring pump & line pressure to the fuel rail & that would test the new pumps check valve. Just because the pump is new, doesn't automatically make it good, make that puppy prove itself.
Then things like CCDI could be messing with you on #3 cyl, or other injectors weeping some on the fuel pressure drop, so still some testing to do without trouble code clues to help steer the trouble shoot.
A bunch more thoughts for consideration, let us know how it goes.
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