Q: Random misfire - 2004 Chevy Express 2500

asked by on

I have this van it was park for about one year. Know that a misfire code p0300 and the light plush all the time. I have check plug, plug wires, injectors flushing. Compressor, coil check, vacuum leak check,pulse in the injector, spark on the plug, plug wire, all coil wires temp sensor changed, and yet the van is miss firing code 300,I steel have miss fire on one side, CV6. CV4 most of the time. when shifted to drive Cy8. Cy2. Also miss fire .only on one bank all the time. i hook it to scanner do snot show any other code. I check intake for leaking, it ok, I switch plugs, coils, injectors coil wires ignition wires, from one side to the other side. I have no lack. any help. Please . It has only 15560 km .

My car has 155680 miles.
My car has an automatic transmission.

Hello. Most of the time if you have a multiple cylinder misfire such as this, it is caused by a fuel system problem. If the fuel pressure is low, then this will occur. If the fuel pressure is fine, then I would also check the signal from the crank sensor as a failing crank sensor can cause this. If that is fine also then I would suspect that there is an electrical issue in the circuit on that one side of the engine. If you want to have this checked out, consider YourMechanic, as a certified technician can come to your home or office to diagnose the misfire and follow through with correct repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Random misfire - 2004 Chevy Express 2500

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Stalling issues, error codes

Hello. The P0442 error code is an evaporative emission control code and is an indication of a small leak being detected in the evaporative emission system. There are usually no visible symptoms of this error code, other than the check...

Q: Gas meter always says full won't allow me to put full up on gas what can I do??

Hi There, It sounds like you may have two separate issues going on here. Your fuel tank sending unit is a unit that monitors the fuel level in your tank. When this is not working properly, you may notice erratic...

Q: Rattle/banging in front end over bumps?

Hello, thank you for writing in. Tracing down a rattle can be frustrating. It takes a process of elimination, and tests to every part of the suspension, steering, and wheel assemblies. You are correct in wanting to test the control...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...