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Hi everyone, I am having a real headache with my 2000 Chevy Blazer. Every morning, it takes at least 15 minutes to get it to start. It only happens in the morning time. It started when the weather got cooler and has gotten worse over time. It is turning over but not catching and starting up. When I turn the key to "on" I can hear the fuel pump but I am wondering if it could still be the fuel pump or maybe even spark plugs? I don't have the problem any other time during the day, it'll crank right up once the engine is warm. I know it's not the battery and starter, already had those replaced. Any ideas, anyone? Has anyone else had this problem?
It could be a faulty coolant temp sensor.
This sensor tells the computer if the engine is cold or hot.
If your sensor is telling the computer that the engine is hot, then everything that is required to start the engine when it is cold will get the wrong information and it will be hard to start when cold.
Probabilities are high that the injectors are leaking down over night. Here's a test for you to try. In the morning, turn the key on but do not start and count to 3, turn the key off. Count to 30 and do the same thing over again but do not engage the starter. Do this 5 times and on the 5th time engage the starter. If it starts up, you have faulty injectors. A nearly plugged fuel filter can also give the same headache so if you haven't had it changed in the last year, it's about time.
Sure it could be the injectors.
Or you could buy 3 coolant sensors for the price of one injector.
Let's hope its not them.
To replace the coolant sensor at the dealer could cost $200.00
To replace the injectors at the dealer could cost $1000.00
Good luck.
You running rich and what happens, on cold engine, fuel does not atomize too well, and does not want to ignite, wetting spark plugs.
Why you running rich can be any cause mentioned above plus many more.
Try this - starting, press gas pedal all the way down to the floor and hold. Keep cranking. Engine should spin, spin, spin, then start catching, and the very moment it picks up, let go off the gas right away. A little bit of art, but not bad.
If it works, have it figured why you run rich.
To replace the injectors at the dealer could cost $1000.00
Or you could do it the intelligent way and just have a Motorvac run on the engine- cost, about 100 bucks. Leaking injectors rarely need replacing, just a major cleaning will do. Motorvac cleans the injectors, throttle plates, and intake system. This is a dealer item and I would avoid those claiming the same thing at Jiffy Junk or Joes We Fixum. Considering it is a 2000 YM, if any of the sensors were out of range it should throw a CEL. That is an OBD-II PCM system. The OP does not mention a CEL.
Come to think about it - thanks to Gimme's post, tipped me on not quite advanced design - it has distributor, right? Replace distributor cap and rotor. At 13 years of service, betcha it's dirty and moist inside. Also, it should have a piece inside, commonly called "chocolate", as it looks like piece of chocolate. Forgot if it's sensor or some sort of ignition thing, but that piece likes to go tired also over time, until you can not start anymore at all.
I also have a 2000 blazer runs all summer long , When temps start to dip vehicle will just crank and crank,in my case the battery seems to drain within 30 sec. I've changed fuel pump,filter,coolant temp sensor,battery. The key ( lock cylinder ) seems to be loose to the point of popping out on its own. My problem is a cold weather issue but very intermittent.looking for that flukey problem ,thanks
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