97 Venture - Starting Issues

My 97 Venture 3.4L is difficult to start after it has been operating. First thing in the morning, it starts up fine. Later in the day, when attempting
to start the vehicle, it is difficult to start. The vehicle has 95K miles...the wires and plugs have not been changed. Could I have a weak crank positioning sensor? I seem to recall that replacing it on 2 other GM vehicles seemed to correct a starting problem. One other important point, at no time has the Check Engine Light come on, to indicate a problem with the ignition/fuel system. Is my problem simply plugs and wires? Any help is greatly appreciated. Thank you, Joe
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First
attempting
GM
At 95,000 miles, that is certainly one of the very first things I would do. Crank sensors don't usually display hard starting symptoms. More often the engine simply quits for no apparent reason.
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Thanks for the reply. I'll try the wires and the plugs first and see if it improves the warm engine starting. I'll report the outcome of the component change. Thank you, Joe

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Joe Guarino wrote:

When your vehicle acts like it's not getting fuel, and you haven't changed the plugs and wires in many tens of thousands of miles...that's the very first thing you should do. It would probably be a good idea to change your fuel filter as well, since you're getting on up there in years and miles.
I'd do an oil change and dump in some injector cleaner to polish it off, too. It never hurts, after all...
When I changed the fuel filter on my Beretta, the fuel that spilled out of the tank side of the filter was dark brown. I'm glad I did it--but it didn't stop my fuel pump from burning out anyway, because the stress on the pump was already done.
If plugs and wires don't do it, it's time to start poking sensors *groan*
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Thank you for the reply. I plan to change the plugs and wires and report if it improves warm starting. I have changed the gas filter already.....I will also add fuel injector cleaner, to see if that makes any improvement. The vehicle is due for an oil change, so I will change it as well. Thanks again, Joe

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