My 2000 chevy blazer is cranking over but won't start drove it 2 days ago and it was fine. It is 28 degrees outside but at night it is getting around 15 or so degrees. I'm guessing it is having a problem starting because it is cold out. Is there any tips on how I can warm up the block or get it to start. Opened up the throttle body and sprayed sensor safe carb and choke cleaner in it and still won't start.

 

You can install a block heater into the coolant system. One approach is heater elements in the freeze plug openings. I think Christine has shown this. That said you should not need this for starting above zero F.

Since you have tried starting fluid check for 1” of strong blue spark during cranking when it cranks but won’t run. Also your battery capacity is lower at cold temps so check system voltage and battery/alternator health.

If nothing then check fuel pressure when it cranks but won’t start.


George

 

For a healthy battery, those temps should not be a problem. Is is cranking slowly or at its normal speed?

If the former, your battety might be at the end of its life. It is when the weather gets cold that a poor battery will not work well.

If the latter, then there could be an issue with the ignition or fuel delivery.