97 Chevy blazer
#1
97 Chevy blazer
i Have a 97 blazer with a 4.3 vortec motor. It has 208,000 miles and has a gutted cat and complete straight pipe exhaust. New fuel pump and filter in 2015. It has a misfire that comes in at about 1500 rpm and doesn’t really go away after that unless you floor it and it doesn’t miss. Doesn’t throw any codes either. This past March I did new plugs wires and cap and rotor. Yes I used oe Delco plugs and duralast gold wires and cap rotor. It also may be related but it keeps losing antifreeze. No leaks and it’s not in the oil either. It has a new radiator and thermostat to. I’m so lost with this if anyone can help me lead to something I’d appreciate it. Thanks.
#4
- Engine Tune-Up Required.
- Excess Fuel Entering Exhaust
- Oil or Antifreeze Entering Exhaust.
- Deteriorated Spark Plug or Spark Plug Wires.
- Oxygen Sensor Not Functioning Properly.
- Road Damage or Broken Hangers.
#5
i Have a 97 blazer with a 4.3 vortec motor. It has 208,000 miles and has a gutted cat and complete straight pipe exhaust. New fuel pump and filter in 2015. It has a misfire that comes in at about 1500 rpm and doesn’t really go away after that unless you floor it and it doesn’t miss. Doesn’t throw any codes either. This past March I did new plugs wires and cap and rotor. Yes I used oe Delco plugs and duralast gold wires and cap rotor. It also may be related but it keeps losing antifreeze. No leaks and it’s not in the oil either. It has a new radiator and thermostat to. I’m so lost with this if anyone can help me lead to something I’d appreciate it. Thanks.
Antifreeze often leaves through intake gasket leak on the 4.3.
Hope this helps
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CONDITIONS FOR RUNNING THE (P030X) DTC
IMPORTANT: If start-up ECT is below -7°C (20°F) , misfire detection is delayed until ECT is more than 21°C (70°F) . If start-up ECT is more than -7°C (20°F) , misfire detection begins after a 5 second delay.
* No active VS sensor DTCs
* No active TP sensor DTCs
* No active MAF sensor DTCs
* No active CKP sensor DTCs
* No active CMP sensor DTCs
* The fuel level is more than 10 percent .
* The engine speed is between 450-5000 RPM .
* The system voltage is between 11-16 volts .
* The throttle position is steady within 2 percent for 100 ms .
CONDITIONS FOR SETTING THE DTC
The VCM detects a deceleration in the crankshaft speed characteristic of either an emission type misfire or a catalyst damaging type misfire.
ACTION TAKEN WHEN THE DTC SETS
If the VCM determines that the engine misfire is significant enough to have a negative impact on emissions, the VCM turns ON the Malfunction Indicator Lamp (MIL) after the misfire has been detected on 2 non-consecutive trips under the same operating conditions. If the misfire is severe enough that catalytic converter damage could result, the MIL flashes while the misfire is present.
https://blazerforum.com/forum/diagno...4-5-6-a-35153/
Last edited by LesMyer; 09-26-2018 at 11:44 AM.
#6
the lights burnt out but I have a code reader and it only has a evap during non purge som thing code
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