SOURCE: Chevy Blazer 1999,car doesn't keep running after started ,car has Passlock
hmmm, sounds like an ignition switch problem. Not the tumbler/key switch, the ignition switch.
SOURCE: 87 CHEVY BLAZER, FUEL PUMP NOT GETTING POWER
It's your Electronic Control Module (ECM). There is a short in the computer. You're going to have to replace it. The same symptoms occurred in my vehicle, had a mobile mechanic come to my house and fix the problem. Quoted me $350 for parts (used) and labor.
SOURCE: 1999 chevy blazer wont start
THE FUEL PUMP IS BAD.
if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.
and i doubt that you are seeing enough fuel pressure to run a vortec engine.
low fuel pressure equals a non running vortec
SOURCE: my 1998 chevy blazer has been having starting
the only way to know for sure is to test fuel pressure. The test port is on the fuel pressure line on the back side of the motor near the distributor. You should have at least 57 psi of fuel pressure. Anything less and it will not start.
If you have no fuel pressure than you'll want to check for power of the fuel pump. You should be able to find a spot where you can access the harness as close to the fuel pump as possible. You'll want to probe the large diameter grey wire. It should have power for 3-5 seconds as soon as you turn the key on and anytime the key is in the start position.
Another thing you can try is spraying a little carb spray down the throttle body. If it starts and runs than this is a classic sign of low fuel pressure. The injector poppets require high fuel pressure to open when you start the vehicle. When the vehicle is running the poppets are under vacuum and require less pressure to work.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: 1993 chevy s10 blazer wont start turns over, changed fuel pump and brain
The first thing I would check is you are getting both spark and fuel at the cylinders. Remove one spark plug at a time and connect to it's plug wire while holding the end of the plug against a solid ground. Have someone crank the engine. If you see a good spark in the spark plug gap I would then make sure you have fuel at the cylinders. Cranking the engine for a bit. Then pull each spark plug out and check that fuel is on the end of the plug. If you have both fuel and spark at the cylinders I would look more at such things as timing belts, sensors, etc.
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