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Starting/fuel issue

Chevrolet Blazer 2000 Blazer 100000 miles

My 2000 Chevy blazer 4.3liter has to keep cranking on and off takes like 20 mins and it starts up and will idle but when you give it gas it will act like it wants to die. Has a new fuel pump, filter, plugs, wires, map sensor, fuel pressure regulator, changed spider, crank sensor even after all that they turn the switch on and off and after about 15 times it will finally fire up and sit there and idle just fine and after it sits about 5 mins and you give gas it acts like it will die then let off and it idles again. Tried to unplug throttle position sensor and could give gas but when let off acted like it wanted to die put back in and same idles but acts like it wants to die and it back fires. What could it be

Tenney from United States a year ago

Comment

Same issue here

1 reply

Bruce from United States a year ago

There are a few potential issues that could cause the problems you described with your Chevrolet Blazer. Some possible causes could include a faulty mass airflow sensor, a clogged fuel injector, a malfunctioning fuel pump or fuel pressure regulator, or an issue with the ignition system such as a faulty spark plug or ignition coil. It's also possible that the problem could be caused by a fault in the engine control module or other electronic component.
To troubleshoot the issue, you may want to start by checking the fuel pressure at the fuel rail using a fuel pressure gauge. If the fuel pressure is within the manufacturer's specified range, you can try cleaning the fuel injectors using a fuel injector cleaning kit. If the fuel pressure is low, you may need to replace the fuel pump or fuel pressure regulator.
You may also want to check the mass airflow sensor and make sure it is functioning correctly. If the mass airflow sensor is faulty or dirty, it could cause the engine to run poorly or stall. Other components of the ignition system such as spark plugs and ignition coils should also be checked to ensure they are functioning properly.