I have a 2000 Chevy Blazer with a 4.2. It has 109,000 miles on it. Recent tuneup (plugs wires cap rotor, TB cleaned). When is it cold outside, it turns over and acts like it wants to start and run, but dies. The colder it is the worse it is. It will start (or has so far) but someitmes it takes 7-10 times of hitting the key, then it starts. After that it is good for the day, no more problems, till it sets overnight. Other than this problem, the truck runs fine.
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Re: Cold starting problem
This is caused by the fuel pump pressure check valve, when this valve fails the gas drains out of the lines and filter and back to the fuel tank, then when u start the pump has to pump the fuel through the lines and filter and then the air has to be purged out of the system by the injectors, this all takes time, result long crank times and numerous start stall. The pressure check valve is part of the fuel pump, the pump is in the fuel tank.
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Check your secondary ignition system, cap, rotor, wires. I suspect either the cap has a lot of condensation in it and is not allowing spark to the plugs or the plug wires are getting wet and leaking spark before it can get to the plugs. Should be pretty easy to check after a long hard rain or if it has been some time since you last tuneup these items along with spark plugs are most likely due for replacement anyways.
Check the plug wire from the ignition coil to the distributor cap. If you haven't already, replace the distributor cap and rotor. The GM Vortec's have issues with moisture getting inside the cap and rotor and causing problems.
I would replace both o2 sensors and take the mass air flow sensor off and clean it with a non-chlroated brake cleaner.Also a tune-up sure won't hurt sparkplugs,plug wires,distributor cap and rotor.Your fuel milage should increase.
Go to Auto Zone and ask to have your computer codes checked. Its free to have done. That way you will know what is needed and the price to pay for the part(s). They also have loaner tools if they are needed
Disconnect the wires and take pictures with cell phone for reference to ensure you don't cross them when reinstalling the new distributor cap. Remove the two torque screws in the distributor cap and remove the distributor cap to access the rotor. Remove the rotor by lifting straight up and inspect the distributor for any condensation and corrosion. Clean the breather screen at the bottom of the distributor before installing the new rotor which just slides back in place. Install the new distributor cap and tighten the new torque screws, make sure you do not over torque the screws since the distributor housing is plastic and prone to stripping. Reattach the spark plug wires and start the engine and idle for 5 min and go for a test drive. Good luck and you may want to also buy spark plug boot lubricant to ensure the spark plug wires are fully installed when placed back on the new distributor cap and recheck connections after test drive. Keep me posted, be glad to know your blazer is running 100% and please rate.