Truck surges on startup from cold, fine after running a few minutes

[gordbb]

Mine does the same thing when it's really cold I would like to figure it out as well.

 

[DaveBen]

Of you are running 15-W40 oil try changing to to 5-W40. Stopped my surging.

 

[tmuller]

I have been running 5w30 Amsoil diesel oil now for nearly 2 years in all weather. I can't imaging it's the oil.

I'm down to 2 things.

1) it's a sensor that is not working correctly when the truck is warming in the morning during glow plugs running
2) due to glow plugs running, there isn't a correct voltage detected by the VR on the alternator (one I am not monitoring) and the truck thinks it needs to charge / not / charge / not / etc.

Next step, going to run a tap to the wire on the alternator directly to battery voltage and bypass the computer to see if there is something there BEFORE I go off and start replacing sensors.

 

[DaveBen]

What year of truck do you have? Add this to your signature so we won't have to ask.

 

[tmuller]

06 F350 Crew Cab. Again, this only started after putting in the new alternator.

 

[bismic1]

Updates?

 

[Ziefer92]

Bumping for any update. My brother is having almost the same problem but right after the change oil, surging at cold start for a couple of weeks now. He's thinking it's the alternator. We will take a look at it right after the smittybilt bumper and new tires installation on our current Jeep project. Any chance your new alternator is acting up?

 

[DaveBen]

These engines are known to surge when cold starting. This is due to the oil, 15W 40 is what the factory puts in. I changed to 5W 40 and the surging went away. I have never heard of the alternator causing surging.

 

[Ziefer92]

Thank you for the tips, Dave. We'll see if changing to 5W 40 would eliminate it.

 

[DaveBen]

Best of luck to you!