12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Slight miss and hard start

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Old 03-21-2013, 05:17 PM
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Default Slight miss and hard start

Ok I have a 96 with only 86000 miles and what is happening is I have to give it slight throttle in order for it to start or it will just crank all day. It also runs a little rougher than it should with a weird noise from exhaust like its misfiring. Now I just noticed when I start it then shut it off I can hear air hissing out of somewhere in the general area of the fuel filter or something around there. My question is any idea where I should start to look for it and if it is leaking air will it cause my problems?
 
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Old 03-21-2013, 05:52 PM
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Yes air in the fuel lines can cause your issue.
 
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Old 03-21-2013, 06:52 PM
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Ok any common places around that area that are known to leak air?
 
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Old 03-22-2013, 10:14 PM
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Your best bet it is take it to someone that has a smoke machine and run some smoke through it to find the leak.

Something you can do yourself is just take a look around and try to locate the hissing noise, look for wet spots and damaged areas.
 
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