Slow starting

Tiny
MPHIPPS8849
  • 1998 CHEVROLET TRUCK

Hi, I have a K3500 crew cab dually with a Vortec 7.4 liter (454) engine.
It has 105,000 miles.
When the truck sits over night, it starts immediately with no hesitation or starter whirling. Bump the starter and it starts. If, after driving or running it, it sits for up to twelve to fifteen minutes it starts immediately, no hesitation. If however, it sits for more than fifteen minutes but less than eight hours, the starter whirls the engine around but the engine does not start for about ten to fifteen seconds. I have had the fuel pump and filters replaced. They have replaced a vacuum hose that was damaged and replaced the spark plugs. They (professional mechanics) tell me the distributor cap and rotor cap are fine. They are clueless at this point. This problem has been ongoing for about 40,000 miles. I typically run unleaded regular fuel, but about every ten tanks run one tank of premium. My repair shop has a mechanic who has a 1998 3/4 ton Suburban with the same engine which has the same problem and they cannot fix it either. They have told me to just live with it. I would really like to get this fixed. The truck did not do this when I bought it and it had 12,300 miles on it when I bought it. The problem did not start until after about 60,000 miles.
No codes are being thrown nor are any indicator lights on I.E, check engine, etc.
Help please! Thank you!

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Tuesday, April 3rd, 2007 AT 11:58 AM

4 Replies

Tiny
JACK42
  • MEMBER

Check the fuel pressure regulator.

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Wednesday, April 4th, 2007 AT 7:54 AM
Tiny
MPHIPPS8849
  • MEMBER

Thanks, but that has been done. I was unaware they had done that when I made the original post. I have talked with the shop since and they did a fuel pressure test and also physically pulled the intake manifold and visually tested the fuel pressure regulator. According to the shop, they have installed two new fuel pressure regulators on the mechanics Suburban and it did not fix the starting problem on it. They have also ruled out the temperature sensor that feeds the computer for the cold-start circuit.

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Wednesday, April 4th, 2007 AT 8:01 AM
Tiny
RASMATAZ
  • MEMBER

An EGR that is crack open will create a huge vacuum leak that will prevent an engine to start immediately, but they did not thirty four years ago and it gave me heck to figure it out. Back then there were no warning lights to warn you about the EGR.

Mr. Jack gave you the fuel pressure regulator what is with this-get it done might lead you to something. Here is more for your problem:

When the pump is turned off or stops running, the system should hold residual pressure for several minutes (look up the specs to see how much pressure drop is allowed over a given period of time). If pressure drops quickly, the vehicle may have a leaky fuel line, a leaky fuel pump check valve, a leaky fuel pressure regulator or one or more leaky fuel injectors. Low residual fuel pressure can cause hard starting and vapor lock during hot weather.

Let me know when you need more.

Good luck. Happy Easter!

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Thursday, April 5th, 2007 AT 6:35 AM
Tiny
SUNSHINE33
  • MEMBER

We had an issue just Saturday with our 1996 Chevrolet dually with the 454 Vortec in it and in my search for the problem, I came across a forum that another guy had the same issue and with as crazy as it may sound, he said his was caused by bad injectors. Just a thought, if you have not tried that yet. But that is what we are changing.

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Monday, August 3rd, 2015 AT 10:25 AM

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