Q: Why is it still misfiring?

asked by on

Replaced the injectors, ignition module, spark plugs. Yet the car still misfires and reads code p0300 and the cel flashes when i put it in gear. Idles fine but seems to vibrate and kinda put also like to burn rich. Like strong smell of gas. Did give off codes p0137,p0138,p0400,p0440,p0441,p1138 also. I cleared them on a ocd reader. Reread codes only throwing off p0300 code now. Clueless, will drive but limited power and cel flashes.

My car has 147913 miles.
My car has an automatic transmission.

Hi there. Check the Exhaust Gas Recirculation valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the engine. You may need to clean the EGR valve or replace it if the valve will not free up.

If you need further assistance with your engine having random misfires with the codes on for the EGR not working, then seek out a professional, such as one from Your Mechanic, to help you.

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. Why is it still misfiring?

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: EGR valve and vacuum

If you got code P0401 for the EGR system malfunction, then the system would need to be tested to see whether or not the vacuum modulator valve is holding vacuum and can control the EGR valve. These tests are needed...

Q: Why does my car still hesitate to start???

There are many causes of hard starting but illustrative ones are a faulty engine coolant temperature switch (sensor), malfunctioning idle air control (IAC) valve, vacuum and EGR leaks, inadequate fuel delivery or pressure (clogged fuel filter, dirty fuel injectors), and...

Q: I think I was way overcharged for repairs.

Whether or not you were overcharged depends largely on what the labor rate is where you went. The cost per labor hour can be anywhere from $70 per hour in a small rural town shop to over $180 per hour...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.