FMTV wrecker rough start and idle, what is it? Attached sound clip

[PowerstrokeNC]

This is how the wrecker sounds when I start it.

things i have done so far....
*changed the intake heater solenoid, since it doesnt knock as bad in warmer weather so thought it might be that.
*checked out fuel all good.

things I have noticed.
as mentioned much less of an issue in warmer weather but still there.
starts to 'clear' out after several minutes of running.
will smooth out somewhat if you apply throttle.

Any thoughts? Appreciate the help.

This is an A1 with electronic/wire throttle pedal if that makes a difference.

 

[PowerstrokeNC]

link to video

https://youtu.be/vxwQLFDqPF4

 

[PowerstrokeNC]

About 30 seconds in to the video you can hear it smooth out a little as my son adds a little accelerator, then as he releases it drops back to very rough again...

https://youtu.be/vxwQLFDqPF4

 

[fsearls92]

Sort of sounds like you might have a bad injector or two.

 

[snowtrac nome]

sounds like bad injectors on the 3126 you pop the old ones out and install the new ones the newer c-7 cats you need a cat program to set trim codes for new injectors

 

[PowerstrokeNC]

Thanks for the input. Any tips on how to diagnose the bad ones?

 

[snowtrac nome]

with cat e-t you can do a cylinder drop test you will be dollars ahead to replace all 6 or chasing bad injectors will be a never ending battle before replacing them take an oil sample if you have high concentrations of metal than replace the hui pump and flush the oil gallies those engines were known for hui pump failures that would send oil through the injectors and cause the problem you are experiencing also each cylinder will need to be vacuumed out as enough oil will drip into them to hydro lock the cylinder if you don't clean tehm out before putting in the new injector.

 

[Suprman]

The fuel primer filter housings go bad and you will suck in some air and it will knock. Also change both fuel filters.

 

[jmb6741]

Pm sent

 

[coachgeo]

yeah knocking injectors can for sure make that hammering sound as it is called in some circles in the diesel world. Start at Will/Suprman's suggestion... then suggest you go to a straight thru Injection clean such as Lubra Molly diesel Purge or others made to be used directly out of a cup or a fuel filter prefilled with it. An Italian Tune up after that might be in order followed by second Injector clean.

If that does not help... then guess it's on to Nome's suggestion?

Keep us posted.

 

[PowerstrokeNC]

The fuel primer filter housings go bad and you will suck in some air and it will knock. Also change both fuel filters.

Do they get distorted then don't seal or ? What should I look for?

 

[Suprman]

The hand primer push button setup seems to be the issue the internal rubber may degrade over time. I have replaced a few.

 

[PowerstrokeNC]

Thanks everyone for the input, I am going to check fuel primer and other suggestions if that doesn't solve it.