White/blue smoke, rough engine, hard start

[makaveli200369]

I have a 2006 I just purchased that is running rough like its missing a cylinder and puffs whitish/slightly bluish smoke. (I bought it for a good deal) I checked out the FICM 48v key on, 48v while starting and 48v while revving. So I think that is okay.

I ordered an auto enguity unit and ran some diags on it. While the engine is running I disable one cylinder at a time. 1,2,4,5,6,8 when disabled all make the engine stumble so they are contributing. 3 and 7 disabled resulted in no change in the engine performance. So I suspect those 2 cylinders to have a bad injector.

I pulled #3 injector and it looks brand new. The tip is not burned. Is it possible for it to go bad internally while looking perfect on the outside? How can I test it?

Thanks guys



I took it ou

[taskforcefreddy]

Short answer is yes. How many miles? What's the service history like? One option is to try running Rev-X through it to see if that helps clean up the injectors. Rev-X goes into the Oil and cleans up the oil actuated components of the injectors.

[makaveli200369]

114k miles. I dont know the history. Everything looks clean and brand new under the valve covers. I wonder if I can send out the two suspect injectors somewhere to be tested or cleaned?

Any thoughts on why when the two cylinders are disabled there is no change in the way it runs but all the other ones do.

[HAM_RADIO_MAN]

Originally Posted by makaveli200369

114k miles. I dont know the history. Everything looks clean and brand new under the valve covers. I wonder if I can send out the two suspect injectors somewhere to be tested or cleaned?

Any thoughts on why when the two cylinders are disabled there is no change in the way it runs but all the other ones do.

Valve train problems? Check to make sure the push rods on those cyl are not bent. 6.0 push rods are the weak link and it seams like they will bend and save other expensive parts from damage. Push rods cost about $11 ea.

[makaveli200369]

Can push rods be removed easily on this motor?

[makaveli200369]

BTW some more info.

I believe the motor has a leaking EGR cooler. I removed the EGR valve and saw it was damp at the bottom. I cleaned the EGR valve and unplugged it so it would stay shut..it still was missing.

[HAM_RADIO_MAN]

Originally Posted by makaveli200369

Can push rods be removed easily on this motor?

Yes, now that you have the valve covers off. Remove the valve hardware on top. Pull out the push rods one at a time and roll them on a good flat surface. If they are bent you will be able to tell.

[makaveli200369]

Well come to find out there is a hole in the piston. Someone had installed 03-04 glow plugs in cylinders 3 & 7 and contacted the piston and put a hole in it. I pressurized the cylinder and hear the air blowing out the crank case.

while pressurizing a good cylinder moved the piston and released a blast of air when removing the air tool.

FML x10000

Motor is coming out

[makaveli200369]

Update: Melted piston on #3

The piston wall doesn't look scored. What it looks like is the aluminum from the piston deposited to the cylinder wall. Once I pull it out hopefully closer inspection shows no scored and I can rehone it to clean off the deposit