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 5.9L hard to start
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C.HARDY
Advanced Member

350 Posts

Posted - 03/30/2013 :  10:17:11 AM  Show Profile  Click to see C.HARDY's MSN Messenger address  Reply with Quote
I have a mechanical 5.9L is tough to start when its cold. Not when its cold outside just if the engine is cold. If I press the accelerator all the way down it will start but runs real rough and will cut off unless you nurse it for a few seconds. After it runs for awhile its fine and will start right up no problem. Im not real familiar with these and any advice is appreciated. Thanks

BJ Henderson
Advanced Member

USA
208 Posts

Posted - 04/01/2013 :  8:02:33 PM  Show Profile  Send BJ Henderson an AOL message  Reply with Quote
Check to see if the injection pump is either leaking down from fuel return check valve or leaking on primary or secondary side of the fuel filter, at least that is where I would start.

CMTT,CMAT,CMBT
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C.HARDY
Advanced Member

350 Posts

Posted - 04/02/2013 :  9:04:33 PM  Show Profile  Click to see C.HARDY's MSN Messenger address  Reply with Quote
Would that make it smoke and miss? It smokes awful for the first few minutes almost like its loading up.

"Hardybusman"
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eddo
Senior Member

USA
89 Posts

Posted - 04/03/2013 :  09:46:59 AM  Show Profile  Reply with Quote
if the fuel system has air in it, it will certainly smoke and miss- and will until all that air gets purged out.


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IBTMech
Top Member

USA
973 Posts

Posted - 04/03/2013 :  3:26:02 PM  Show Profile  Visit IBTMech's Homepage  Reply with Quote
You are sucking air on the primary side somewhere. Secondary side is under supply pump pressure. Any leak would show.

If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years.
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offroadwolf1
Active Member

33 Posts

Posted - 04/05/2013 :  12:43:49 PM  Show Profile  Reply with Quote
Im with IBTMech, your sucking air in it. Disconnect the fuel line as close to the pump as you can and rig up a piece of clear hose in place. Run it for a while till all the bubbles are gone. Then mash the throttle and watch it, you will see more air coming in through the sight line. You can put a sight line in several places to isolate where the air is coming from. I have seen a lot of water seperators sucking air, put your sight line in and bypass the water seperator and filter and see if you have noe more bubbles.
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C.HARDY
Advanced Member

350 Posts

Posted - 04/10/2013 :  7:32:53 PM  Show Profile  Click to see C.HARDY's MSN Messenger address  Reply with Quote
10-4 I'm going to get on it next week I hope. Runs good now that its warm...lol

"Hardybusman"
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jr4wdman
Active Member

13 Posts

Posted - 04/11/2013 :  5:52:08 PM  Show Profile  Visit jr4wdman's Homepage  Reply with Quote
Some 5.9 mechanicals have an intake heater. If it's not working it can cause long crank times and rough running once it is started until the engine warms up.

Good luck!
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