rough idle

[scotty2280]

i just replaced my ficm and still have a rough idle issue when i stop. i had the po611 code so i replaced the ficm. now i have no codes but still idles rough at some stop signs. anyone got ant ideas on what to look at?

[Dave]

Warm engine, cold engine? When does it do it?

Meet up with Dan and hook up to AE and run a buzz and contribution test

[scotty2280]

dan has one?

[TurboSevenThree]

Originally Posted by Dave

Warm engine, cold engine? When does it do it?

Meet up with Dan and hook up to AE and run a buzz and contribution test

On the 6L's say it passes a buzz test all 8 and contribution is fine but it runs rough only while cold? As in up until that normal operating range... then once it's "warm" it smooths out like water. Does that mean the injectors are failing? Even though it acts normal at all times once it's warmed up. And is that any different for a 7.3? I heard that meant the injectors were failing, but I don't get how that can be if the engine runs fine once warmed up.

... not trying to hijack... I'm just curious.

[Dave]

Originally Posted by TurboSevenThree

On the 6L's say it passes a buzz test all 8 and contribution is fine but it runs rough only while cold? As in up until that normal operating range... then once it's "warm" it smooths out like water. Does that mean the injectors are failing? Even though it acts normal at all times once it's warmed up. And is that any different for a 7.3? I heard that meant the injectors were failing, but I don't get how that can be if the engine runs fine once warmed up.

... not trying to hijack... I'm just curious.

If it goes away when its warmed up it could be one of two things. You need an oil change or you have a sticking injector

[scotty2280]

mines does it when i stop at lights, not all the time there seems to be no rime or reason when, the whole truck just starts shacking. its like it has a problem idling sometimes when i come to a stop. when the trucks warm i guess.

[TurboSevenThree]

Originally Posted by Dave

If it goes away when its warmed up it could be one of two things. You need an oil change or you have a sticking injector

Hhmmmm. OK. Well that's interesting.

[scotty2280]

met up with dan today and did a buzz test and it passed and showed no codes.....

[TurboSevenThree]

Originally Posted by scotty2280

met up with dan today and did a buzz test and it passed and showed no codes.....

Contribution/balance test...?

[scotty2280]

it didnt give the option for that when it was hooked up.