Problems Starting 93 SHO

[fourdubb]

i am having problem with 93 sho.
i starts fine in the morning, but the further through the day i get and the more i start it, the less it will start. at first it takes a try or two and it will start, then at the end of the day, it wont start at all.
i am just trying to figure out what is wrong, so i can see how much it will be to fix it, and if i should waste my time and money or not.
i have been looking through many posts about these types of problems, but none of them seem to pertain to mine.
i have checked the sparkplugs/coil pack. all if fine there.
checked the starter all is fine there.
what else could it be?
and what would be the easiest/best way to find my problem.

[shorod]

Welcome to the forum!

When the car won't start, does it crank fine, just doesn't take off? If so, based on your description, the fuel pump is probably failing. The fuel pump is in the fuel tank and is basically an electric motor. After awhile, the pump motor will fail.

What you may want to do to help diagnose the problem will be to find a fuel pressure gauge and keep it with you in the car. You may be able to borrow one from an auto parts store, or you can pick one up for under $20.

Measure the fuel pressure when the car starts fine. You will want to note the fuel pressure when you turn the key to "run" as well as with the engine running. Check these numbers against the specified fuel pressure for your car. If the numbers are below spec, replace the fuel filter if that has not been replaced recently.

You may also want to try priming the fuel system a few times before cranking the engine when the car doesn't want to start. You can do this by turning the key to the run position, leaving it on for 3 seconds, then turning the key off for about 10 seconds, then back to run for 3 seconds, off again for 10 seconds, then back to run for three, then to start. If this seems to help, it would indicate low fuel pressure. If the filter is new and properly installed (they are directional), again I would point the finger at the fuel pump.

Now when the car won't start, or struggles to start, again check the fuel pressure. Is it lower than first thing in the day when it started easily? If so, you probably have a suspect fuel pump.

If the fuel pressure remains good even when the car struggles to start, hold the accelerator pedal all the way to the floor and crank the engine. If it starts this way, you may have a situation where you have one or more leaking fuel injectors that are draining into the cylinders and flooding the engine. Holding the accelerator to the floor (wide open throttle - WOT) shuts off the pulse to the fuel injectors.

If a leaky injector is the problem, I wouldn't expect the issue to get progressively worse through the day though. I still think the fuel pump is the number 1 suspect based off of what you typed.

-Rod

[fourdubb]

thank you i will check that.