Bigcam 3 400 extra long cold start 40f

[akita91]

Whats the common problems with hard start ? i have 2 batteries, both charged,it takes at least 2 cranks each about 15-20 sec before it fires up.missing ,dies if i keep foot of throttle ,gotta hold for about another 15-30 sec wot , rpms slowly crawls to 2100.
Ive read some threads here and other places,it could be pump,cylinder comperssion or else ?if its above 50 ,starts right up

 

[Elijah95]

Have you ruled out the possibility of fuel drain back? Losing prime can make a mess out of a perfectly good engine on initial start up

 

[162tcat]

Have you ruled out the possibility of fuel drain back? Losing prime can make a mess out of a perfectly good engine on initial start up

I think he nailed it. Sounds like you have an air leak somewhere between the pt pump and tank.


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[akita91]

i dont even know about this issue at all,will learn and look up

 

[akita91]

how do i check air leak ?

 

[simp5782]

Have you replaced the fuel filter recently? The check valve may be allowing backflow or a bad gasket. Check that before replacing the line. It is a 1/2in fuel hydraulic line. Ditch that and go with 5/8 or 3/4" push lok line and fittings. So you get more fuel flow for added power.

 

[sandcobra164]

Sounds about like the NHC-250 in my 5 ton in the cold if I don't use the ether start. It can be parked for a month and fire off in 2 seconds if the temps are warm. Do you have white smoke while you are cranking when cold? If so it sounds like you're truck is doing just fine.

 

[akita91]

ye i changed it back in september,50 miles since then.hmm,ive been stalking your posts ,gotta check it out again

 

[akita91]

yeah it smokes hard when cranking and cold after start for 5 min or until i spin around the block

 

[162tcat]

Before you start spending money on expensive parts start with the cheap basic items. Fuel filter was recently changed so it may not have seated properly. Fuel line replacement is a maintenance item, I would just do it to rule that out and for piece of mind. If that doesn't fix it, start diagnosing other stuff. Have you thought about a block heater? If it's just cold blooded that will help tremendously.


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[162tcat]

Just to add a little more info, my m809 with the NHC 250 will crank for about 10 seconds when it's 30-40 degrees out with the smoke getting progressively thicker until it fires off. Once it kicks off it just purrs while it builds air.

If I plug in the block heater, it fires right off like it was just running 5 min ago no matter how cold out.

I always use the block heater these days if I know I will be running it and temps are expected to be under 40.


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[akita91]

i will look up those leaks then get back here
https://www.youtube.com/watch?v=gJNt81Wxb9o
this one fires up ,im just guessing whats my issue