The engine runs great until it starts to warm up and then it seems that the fuel pump gets a signal to stop pumping and,,, kaput! I've changed the water temp sensors, removed and cleaned the throttle body and cleaned all 3 sensors. I replaced the coil assy, starter. The idle air control valves measurement was correct. And I am showing no check engine light.
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Re: car needs help,, so do i!!
Its not a sensor of any sort its just your Fuel Filter that hasn't been replaced for a long period of time. Try changing that and you'll be good to go. Let me know if this helps and anymore questions feel free to express it.
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You can't rule that out, a computer failure, but some testing would have to be done to truly determine the cause. The computer should send a signal to the fuel pump relay to turn the fuel pump on, both at key turned to on, and when key is in start-cranking the engine over. If you have to use starting fluid for hot restarts as you described (will it stay running then after starting it with the fluid?)...then it seems to be a fueling problem. I would say check fuel pressure, auto parts stores rent or loan them. It may be, for whatever reason, the pump is not being turned on through the fuel pump relay when it won't start without starting fluid.
It sounds like the pump is failing. That or sometimes not getting electricity. To check which it is, you could use a voltmeter or test light at the gas tank's electrical plug in. You need to check for power on the fuel pump wire when the engine is being cranked for starting. Do this when turning the key to on does not cause the pump to turn on for 2 seconds as it should. The fuel pump has power for those 2 seconds when key is turned to on, and again has power when the engine is cranked. You might miss the two second signal, so check for power when car won't start-when pump won't turn on-and with the engine cranking. If you have a signal then and still no pump coming on, then you must have a failing pump.
But if you have NO power to fuel pump wire with engine cranking, then it is a problem elsewhere-probably the pump relay (try a new relay if you haven't already). That relay is signaled by the engine computer when key is turned to on or when engine cranks . so you could do some testing at the relay if needed.
That's often a sign of a failing check valve in the fuel pump. Try this. When you turn the key to RUN, the fuel pump activates for 2-seconds to boost any lost pressure. Try turning the key to RUN, then OFF and repeat three times. If the engine starts right up, you probably need a new fuel pump. The real test is called a leakdown test where the shop throws a pressure gauge on it and leaves it overnight. If it loses more than 5-10-psi, the check valve is shot. Can't be replaced separately .
I would go with the injector pump first, if it's older than 10-15 years, and then the fuel pump would be my next guess. Check first to see if the fuel pump is actually pumping fuel before doing either.
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day.
their are a multitude of reasons the majority or the usual suspects are - if any codes have read and most auto stores offer this service for free --needs tune up ---egr valve carboned or failing --fuel pump /filter failing or partial clogging --catylic converter failing or clogging --injectors- tbi needs replacement or rebuild-- bad fuel any of these can cause such problems and not set off the check engine light