Hey folks hopefully someone can give me some insight on this...I have a 2000 blazer 4dr 4wd with a tad over 130,000. anyways couple months ago i replaced the upper and lower intake gaskets along with the upgraded mfi spider assembly, cap and rotor, new radiator and a coolant system flush. Truck has ran great ever since...but now that its 14 degrees out this mornin truck dont start and i can crank over till battery dies...fires for a second or 2 but then no more. seems that every winter i come across the same problem. i can hear the fuel pump turn and off with every cycle of the key just no start..any ideas would be be greatly appreciated as i would love to finally figure this out.

 

There is a problem that needs addressed but doing the following can both help in the short term and identify the reason for the hard start and start toward solution:

If it doesnt start in 5 seconds of crank, while not touching gas pedal then

While starting new crank cycle, floor the accel and keep it there for 10 seconds
- will cause PCM to send less fuel. if it's sending too much fuel, normally it should start

then if still no start

begin new crank cycle while pumping the pedal several times to signal the PCM to send more fuel.

It's important to do it in that order until you identify which works to get it started. If you pump pedal first and it's flooding in normal start, you make it even worse.

 

Might be a good idea to get the fuel pressure tested. 96+ Fuel System Diagnosis