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Phil 3/23/2011

2000 Chevrolet Blazer LS 6 Cyl 4.3L


2000 Chevy Blazer won't start if it was not run the previous day. Starts fine after the weather warms up.

This is my wife's so I can't remember if it is an LS or an LT. It's a 4-door with 4WD.
Has about 160000 miles on it.
The engine cranks but does not start.
The battery and alternator were brand new last winter.
The distributer looks clean, but the spark plugs/wires have probably never been changed.
We had the fuel pump replaced last spring since a mechanic said that was the problem.
I bought a fuel pump tester to check the new pump. The new pump is putting out 60 PSI...so I doubt it is bad. However, my wife has been recently saying that the fuel gauge fluctuates (I know the sensor is in the fuel pump assembly). The new fuel pump is still under warranty.
I used the pump tester the other morning when it would not start, the fuel pressure read 60 PSI. I left it connected and it still read 60 PSI 8 hours later.
The next day it was warmer out, the tester gauge read 58 PSI with the key on, and the engine started
This problem seems to only happen in the winter and cold weather

1 Answer


Phil 4/14/2011

In case someone else has this problem... I gave up on trying to fix this myself and brought it to a repair shop.

The problem ended up being the starter. The gear was messed up and not fully engaging the flywheel. Because of this the engine was turning over, but not fast enough to start. I'm still not sure why this was only a problem on cold or humid days after the car sat for 24 hours though...


AutoMD Member 11/19/2013

I have a 2000 Blazer LT and on cold and/or humid days the engine will turn over, but takes several tries to start. The starter was replaced about 2 years ago, new spark plugs, ignition wires, new fuel pump in the past year. So far, the engine always starts eventually on cold days, and then no problem for the rest of the day. We're going to try a new ignition module and coil to see if it fixes this problem, but still not sure if that's it. Can someone make a suggestion?

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