Question about 1998 Chevrolet C3500

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1998 Chevy Silverado 3500 7.4 starts hard when warm

Recently purchased this vehicle and have replaced the fuel pump, spark plug wires and plugs, cap, and oil pressure sender. We have had it into the shop and on a computer but no codes come up. It acts like it is flooding when you try to start it while the motor is hot. I am at a loss. Thanks!

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  • cohoon4 Feb 11, 2009

    We tried changing the coolant temperature sensor but this did not fix the problem. If it sets for like 5 minutes after driving, you have to crank it about 15 to 20 seconds to get it to fire but it still acts like it is flooding and you can smell gas. If you shut it off and refire immediately, it takes right off. In addition to the above mentioned parts replaced we have also replaced the coil. It was on the computer again today and still no code. We are at a loss. Thanks!

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Just did mine and it was the fuel pressure regulator, same exact symptoms you had.

Posted on Sep 20, 2009

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Have u check your injectors they will leak down on the 454 vortex mine did

Posted on Dec 08, 2012

  • ken w Dec 08, 2012

    have u check your injectors they will leak down on the 454 vortex mine did

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I'd check coolant temperature sensor, it should be at center, front of engine. Not 100% sure on your vehicle, but on some I've worked on, the coolant temperature sensor was faulty, basically telling vehicle computer that engine was still cold, so dump more fuel.

Posted on Feb 10, 2009

  • Mike Butler
    Mike Butler Feb 12, 2009

    I'd pull a couple or few spark plugs& start looking at plugs about 10-15 min after shutting it off, to see if they are wet. Have you tried leaving fuel pressure gauge on it when you shut engine off, just to see if fuel pressure is dropping?

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I had the same problem with my 99 7.4 and the injectors would bleed off in the cylinder. you might need to have them tested or replaced

Posted on Jul 02, 2009

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