cold start problem

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Mar 18, 2016 | 10:24 AM

#16

ssls6

More Turbo

Joined: Dec 2003

Posts: 534

Likes: 168

From: Park County, CO

Quote:

Originally Posted by bkollmeyer

Hi thanks, could you elaborate a little bit on this? Do you know what specifically about the air injection system is running or is supposed to run during cold start? Any specific info would be extremely helpful!

This video explains it better than I can type. I noticed the system on my 6.2L early on since I can hear it operate (or at least shut off).

Mar 18, 2016 | 07:27 PM

#17

Slowpoke Slim

Laughing Gas

Joined: Nov 2012

Posts: 1,169

Likes: 29

From: Bismarck, ND

I think the coldest I've started mine is at -40F. It cranked slow, but it started right away and idled cold with no problems. That was true air temp, and not "wind chill". And that was with the block heater not plugged in.

Glad you got yours fixed.

Mar 18, 2016 | 08:21 PM

#18

bkollmeyer

Freshman User

Joined: Feb 2015

Posts: 27

Likes: 0

Quote:

Originally Posted by mspeodtech

got the 6.2L gas, F250 back from the dealership a few days ago. The mechanic/tech stated that after checking AIT, MAF and the other likely sensors, that they discovered a pinched manifold vacuum line and that solved the issue. I did not speak with them directly, wife picked up truck. I have started it every morning (4 mornings) since I got it back and it starts quickly and runs smoothly. Temps have been in the low to mid 30s, which was aproblem. No warm up period needed. Im keeping my fingers crossed, but so far so good. Good luck

Glad to hear that your truck is starting better! I went to my dealer today and had them print me an exploded diagram of every manifold vacuum tube on this engine. I thought maybe I was missing something, but I wasn't. There are only two lines-one for the crankcase vent, and one for the PCV. They are both hard plastic lines wrapped in a kind of foam protective shielding. I don't see how one of those could possibly have been kinked or pinched??? Do you think you could call your dealer and ask what specific hose was pinched? Honestly, I don't see how it could have been a manifold vacuum line-maybe a different vaccum line?

Your post got me thinking though about maybe a vacuum leak that I am not hearing. So today I sprayed some carb cleaner around the vacuum lines and fittings with the engine running but I didn't find anything. At least not anything obvious.

THANKS!

Mar 18, 2016 | 08:35 PM

#19

bkollmeyer

Freshman User

Joined: Feb 2015

Posts: 27

Likes: 0

Quote:

Originally Posted by ssls6

This video explains it better than I can type. I noticed the system on my 6.2L early on since I can hear it operate (or at least shut off).

https://www.youtube.com/watch?v=nIhDLnTGMAE

This is very interesting. I watched this like 4 times to understand. Then I went to fordparts.com to look for air injection system components. I found the sub category "air injection system" under the main category of "emission control" but there are zero components in that sub category.

I have replaced my vapor consister purge valve already (a suspect evaporative system part with a high failure probability)

Can you take a picture of the part that you can hear operating during warm up? I'd like to figure out exactly what part it is???