98 chevy 3500 dually 454 no fire ?

[minnesota jim]

turns over like crazy!! had oil in gas, changed oil,one day just no start, what the ??? any help a buddy told me my coil pack was out any words of wisdom to darn cold out to start just tearing the thing down only have 160k on her she just won't fire tries to, but just coughs once in awhile

[75K30]

Welcome to the site:
Oil in the gas, or gas in the oil. I know it sounds like I am being picky, but there is a bit of a difference.
Anyway that should be addressed.
When you describe "no fire" does this just mean that it will not start or you have no spark? The fuel in oil coild be a fuel delivery problem, and could have fouled the plugs.
Might verify that you have spark.

[minnesota jim]

yea gas in the oil, my bud said change the oil so i did, getting plenty of gas, you can smell it my girlfriend said she was having a hard time starting it while I was gone hunting "yea i know why was she driving my truck" came home i ran it for a day, next morn no start

[ryeja]

Is the fuel pump running when the key is shut off? Could be a bad fuel pump relay or in my case was bad injectors. For that much fuel to be dumping I too would suspect fuel delivery problems. Check the fuel pressure and make sure it's not bleeding down too quickly after you turn off the key. You should also be able to hear your pump whir up then shut off when the system is pressurized fully.
Don't rule out spark though either, check your plugs and make sure you have good spark when turning the engine over.

[mudseeker]

fuel smell and gas in the oil sounds like your injectors are leaking. try holding the gas to the floor while cranking. this will put the truck in flood mode and shut the injectors off while it is trying to start.