Injector issue's

pistonbully · Apr 9, 2014

2005 6.0
Truck has had 4 injectors replaced (injector number 1) 2 by Ford 1 by another mechanic shop and 1 by owner. First 3 injectors run for roughly 3000 Kilometers then started throwing a contribution code. 4th injector is still in but is also throwing a contribution code.
Truck starts good and idles for a few minutes just fine then its goes to hell in a hurry. It starts to miss and blows blue smoke, after awhile it clears itself up and runs fine again.
I need ideas where to look next. Always number 1!!! seems strange.
ICP pressure is good. It has a new FICM.

webb06 · Apr 9, 2014

Where are the injectors from? What brand?

pistonbully · Apr 9, 2014

All of them are from ford

pistonbully · Apr 10, 2014

Mdub707 · Apr 10, 2014

Which injectors specifically are going bad? How's fuel pressure? How's injection pressure? OEM oil filter and cap? Buzz test passes fine? Have you tried swapping injectors to different holes to see if the problem follows the injector or stays in that cylinder?

Irontx · Apr 10, 2014

I would also be taking g a good hard look at the harness/plug connector...... especially Iif the problem stays in the hole....
Also. .. have you tried swapping in a known good working ficm?!?!? See if it has the same problems....

pistonbully · Apr 10, 2014

Its always injector number 1
Ficm has been swapped out, ICP is good, Harness looks good but that doesn't mean it is.
No buzz test yet but its on the to do list.

golfer · Apr 10, 2014

A cylinder contribution test code is not an 'injector' code.

CCT test:
this test compares the RELATIVE BALANCE between the output of (not just the injs!) but
everything that contributes to the power output of that cylinder...which includes quite a lot.. from
that cylinders compression (piston ring sealing), the intake & exhaust valve sealing, valve lift,
injector output, etc..we've even seen bad torque converters and flywheels cause enough engine
vibration to cause various cylinder balance faults..so, while a scan tool can aid in the
detection/direction of a problem... experience can & will outweigh a scan tool 9 out of 10
times..."no codes" doesn't mean everything is "OK"...and conversely...just because you HAVE a
code...doesn't mean that there is a problem...or it has anything at all to do with a specific problem
or issue.
so...a truck could have 8 weak injectors...that show up FINE on these tests...or 8 GOOD injectors
that could fail CCT in a worn out engine...balance is balance...so even if you DID have
something show up on a CCTest...it doesn't mean it's BAD...hell we've seen guys replace the
same inj, multiple times...leaving the other 7 w/ 200k+ miles...and call back saying that they still
have the same code(s)...in these types of cases...a STRONG injector will show out of balance
against the 7 old/weak injs...
More rare issues, such as aerated engine oil...or aerated fuel can also cause
goofy/poor/inconsistent running issues..that new injectors can't fix...or may only fix for a short
time...

pistonbully · Apr 10, 2014

It passed the buzz test.
Has a bullet proof diesel external oil cooler and filters.
Truck idles cold just perfect and runs perfect. Once warm the idle turn into more of a lope and lots of smoke.
Probably try a different ficm. See if the new one is NFG.

Gary · Apr 11, 2014

Check to make sure the injectors were installed correctly. I've seen it plenty of times before where somebody changed a injector(s) and then it started to run like you described. I think what their doing wrong is some oil was left in the injector hold down bolt hole (it's a blind hole) and the bolt hydraulics, they think it's tight, the oil then works out and the injector come loose, or they just don't torque it correctly, then compression aerates the fuel. I'll bet I've seen this problem at least six time in the past year alone.