Surging Idle on start up M1078

[alleuro]

I have a LMTV with 13,000 miles it has sat a while but I drove it home 40 miles without issue. When I start up the idle is loping and surging any ideas on what to check? Temps are in the 30s here now but I have the block heater plugged in and the engine block is warm to the touch. I'm going to change the fuel filters and have drained the water separator. After it warms up it idles ok. Just wondering if something simple needs checked out? fluid levels are all fine but the engine light is on and batteries have low voltage.

Just learning the bugs and trying to get this ready to use as an RV for my Alaska adventures.

 

[snowtrac nome]

If your fuel filters don't help look at the primary filter housing ,the primer balls are notorious for leaking air into the system, if you get air introduced into the fuel system it will make for short a life for your fuel injectors.

 

[scottmandu]

3116, C7, or 3126?

 

[alleuro]

3126 cat.

 

[snowtrac nome]

being an electronic motor you can rule out a governor. get a prolink or some one with cat et to plug in and see what codes you have stored.

 

[alleuro]

If your fuel filters don't help look at the primary filter housing ,the primer balls are notorious for leaking air into the system, if you get air introduced into the fuel system it will make for short a life for your fuel injectors.

How do you detect if the primer ball is bad? Should it pump up hard and stay that way? I'm still having issues and the check engine light is on. I'll try to find a code reader and see what it says.