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michael mccue Posted on Sep 10, 2016
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2004 chevy blazer code 304 missfire number 4 cyl

I get a ramdome check engine light code 304 I have replaced the spark plug checked the distribitor cap and wires. some times the light goes out after blinking for a while other times it stays on until I shut the car off, I check it with a code reader ,some times there is a stored code (304) sometimes there is no code stored. I never have a lost of power during these events. My gas mileage is good both in town or highway. My idle is always smooth with the light on or off. I have taken two trips of more than 400mi and sometimes go long distances with out a problem!

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Jeff Armer

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  • Chevrolet Master 15,575 Answers
  • Posted on Sep 10, 2016
Jeff Armer
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Joined: Nov 22, 2012
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If plug an plug wire has been replaced , an dist. cap an rotor an problem is still there ,maybe a fuel injector problem .
Perform the fuel injector coil test. Refer to Fuel Injector Solenoid Coil Test .
A fuel injector coil winding resistance that is too high or too low will affect engine drivability. A fuel injector control circuit DTC may not set, but a misfire may be apparent. The fuel injector coil windings are affected by temperature. The resistance of the fuel injector coil windings will increase as the temperature of the fuel injector increases.
Diagnostic Aids
?€¢
Monitoring the misfire current counters, or misfire graph, may help to isolate the fuel injector that is causing the condition.


?€¢
Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition.


?€¢
Perform the fuel injector coil test within the conditions of the customer's concern. A fuel injector condition may only be apparent at a certain temperature, or under certain conditions.



2

Observe the ECT Sensor parameter with a scan tool.
Is the ECT Sensor parameter within the specified range?
10-32?°C (50-90?°F)
Go to Step 3
Go to Step 4

3

  1. Disconnect the multi-way harness connector of the fuel injectors.
  2. Measure the resistance of each fuel injector between the ignition 1 circuit and the fuel injector control circuit, at the multi-way connector with a DMM. Refer to Testing for Continuity in Wiring Systems.
Is the resistance within the specified range for each injector?
11-14 ohms
Go to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2
Go to Step 6

4

  1. Disconnect the multi-way harness connector of the fuel injectors.
  2. Measure the resistance of each fuel injector between the ignition 1 voltage circuit and the fuel injector control circuit, at the multi-way connector with a DMM. Refer to Testing for Continuity in Wiring Systems.
  3. Record each fuel injector resistance value.
  4. Subtract the lowest resistance value from the highest resistance value.
Is the difference equal to, or less than, the specified value?
3 ohms
Go to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2
Go to Step 5

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