Truck Trend Garage: 2000 Chevy Blazer Cold Weather Start Problems

Cold-Weather Crank

Alex Steele
May 22, 2009
Question: My 2000 Chevy Blazer has the 4.3-liter V-6, and it won't start when the temperature outside gets below 32 degrees F. What should I check first?
Photo 2/2   |   2000 Chevy Blazer cold Weather Start Problems
Answer: If you mean the engine won't crank over, it probably needs a battery or something related to the starter or charging system. If you mean the engine cranks over but won't start, finding the problem gets more complicated and requires further testing. If you're familiar with some basic procedures, check for spark and fuel pressure while the engine is cranking--cold--and failing to start. After that, you need a scan tool to check for diagnostic trouble codes and evaluate specific electronic data coming out of the Powertrain Control Module (PCM). It could be a faulty coolant temperature sensor supplying inaccurate information, which can hamper a good cold start, or other possibilities like a bad ignition coil, fuel pump, or the injector assembly, to name a few. The 4.3-liter uses Central Sequential Fuel Injection (CSFI), an all-in-one system that includes a fuel regulator, injectors, and pipes leading to poppet valves at each cylinder. This system has had a few issues; one is a rough-running condition due to the poppet valves getting stuck open or closed. An injector-cleaning procedure can sometimes--but not always--correct the problem. That's why, if you return to the dealer for a second visit with the same poppet valve problem, GM recommends a conversion kit. The kit will convert the system from CSFI to Multiport Fuel Injection, basically eliminating the troublesome poppet valves and going back to the standard setup with injectors at each cylinder. This may not be the specific cause of your cold-start condition, but it may be relevant.
How To Reach Alex
If you have a technical question regarding your pickup, SUV, or van, feel free to contact Alex, a master technician with the National Institute for Automotive Service Excellence. Send a letter to him in care of Truck Trend Garage, 831 S. Douglas Street, El Segundo, CA 90245, or e-mail us at Please include the VIN with your question. Due to the volume of questions received every month, we cannot guarantee that everyone's question will be personally answered or will appear in the magazine.

Can't wait for help with a problem you're having with your Truck or SUV? Ask the expert we trust here at Truck Trend Garage--visit Alex Steele at
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